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<a class="post-title-link" href="/2019/03/16/Vue学习笔记/" itemprop="url">Vue学习笔记总结</a></h1>
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<li><h5 id="这篇是用-markdown-写的-建议下载一个markdown阅读器-typora-方便阅读。"><a href="#这篇是用-markdown-写的-建议下载一个markdown阅读器-typora-方便阅读。" class="headerlink" title="这篇是用 markdown 写的,建议下载一个markdown阅读器 typora,方便阅读。"></a>这篇是用 markdown 写的,建议下载一个markdown阅读器 <a href="https://typora.io/" target="_blank" rel="noopener">typora</a>,方便阅读。</h5></li>
<li><h5 id="公司前端项目基本都用的Vue全家桶"><a href="#公司前端项目基本都用的Vue全家桶" class="headerlink" title="公司前端项目基本都用的Vue全家桶:"></a>公司前端项目基本都用的Vue全家桶:</h5><ul>
<li>路由管理：<a href="https://router.vuejs.org/zh/" target="_blank" rel="noopener">Vue-Router</a>，官方文档写的很清晰。</li>
<li>数据请求：双控用的<a href="https://www.kancloud.cn/yunye/axios/234845" target="_blank" rel="noopener">Axios</a>、另外有一些项目用的 Vue-Resource。</li>
<li>状态管理：<a href="https://vuex.vuejs.org/zh/guide/" target="_blank" rel="noopener">Vuex</a>，目前只有双控项目用到了，官方文档教程写的很清晰，需要花费时间去学习。</li>
<li>UI框架使用的<a href="http://element-cn.eleme.io/#/zh-CN/component/tabs" target="_blank" rel="noopener">Element-UI</a>，注意老项目Element版本不同配置方法。</li>
<li>依赖包管理：基本用的是<a href="https://yarn.bootcss.com/docs/" target="_blank" rel="noopener">yarn</a>, 最好别和npm一起混用。</li>
<li>css预处理器:<a href="https://www.sass.hk/docs/" target="_blank" rel="noopener">sass</a>，sass可以做很多事情，变量、继承、函数、Mixin、运算、循环等、熟练了写起样式会很高效，官方文档教程也讲的很清晰。这是我收藏的几个CSS网站 <a href="https://css-tricks.com/" target="_blank" rel="noopener">css-tricks</a> <a href="http://css3generator.com/" target="_blank" rel="noopener">css3-generator</a> <a href="http://gradient.awesomes.cn/" target="_blank" rel="noopener">gradient</a> <a href="https://www.cssmatic.com/box-shadow" target="_blank" rel="noopener">box-shadow</a>，能够快速的生成一些好看的CSS效果。</li>
</ul>
</li>
<li><h5 id="可以学一下-ES6-语法，解构赋值、对象的-assign、-展开操作符-、属性名简洁表示、async-await-等一些经常会用到。有空的话可以了解下正则（JavaScript-正则表达式迷你书）-最近经常能用到。"><a href="#可以学一下-ES6-语法，解构赋值、对象的-assign、-展开操作符-、属性名简洁表示、async-await-等一些经常会用到。有空的话可以了解下正则（JavaScript-正则表达式迷你书）-最近经常能用到。" class="headerlink" title="可以学一下 ES6 语法，解构赋值、对象的 assign、 展开操作符 、属性名简洁表示、async await 等一些经常会用到。有空的话可以了解下正则（JavaScript 正则表达式迷你书）,最近经常能用到。"></a>可以学一下 <a href="http://es6.ruanyifeng.com/?search=%E5%B1%95%E5%BC%80&x=0&y=0#docs/destructuring" target="_blank" rel="noopener">ES6</a> 语法，解构赋值、对象的 assign、 展开操作符 、属性名简洁表示、async await 等一些经常会用到。有空的话可以了解下正则（<a href="https://github.com/qdlaoyao/js-regex-mini-book" target="_blank" rel="noopener">JavaScript 正则表达式迷你书</a>）,最近经常能用到。</h5></li>
<li><h5 id="下面的这些是我在刚开始学习Vue基础部分时做的笔记，整合删改了一些，又添加了一部分示例，基本涵盖了Vue基础知识，供参考，也可以直接看官方文档的教程。我学习Vue时主要也是通过官方文档，把基础部分过一遍，示例代码手敲自己运行一下，刚开始可以先不深究原理，先掌握基础用法，在项目中碰到看不懂的代码再去查阅文档或请教恒哥。"><a href="#下面的这些是我在刚开始学习Vue基础部分时做的笔记，整合删改了一些，又添加了一部分示例，基本涵盖了Vue基础知识，供参考，也可以直接看官方文档的教程。我学习Vue时主要也是通过官方文档，把基础部分过一遍，示例代码手敲自己运行一下，刚开始可以先不深究原理，先掌握基础用法，在项目中碰到看不懂的代码再去查阅文档或请教恒哥。" class="headerlink" title="下面的这些是我在刚开始学习Vue基础部分时做的笔记，整合删改了一些，又添加了一部分示例，基本涵盖了Vue基础知识，供参考，也可以直接看官方文档的教程。我学习Vue时主要也是通过官方文档，把基础部分过一遍，示例代码手敲自己运行一下，刚开始可以先不深究原理，先掌握基础用法，在项目中碰到看不懂的代码再去查阅文档或请教恒哥。"></a>下面的这些是我在刚开始学习Vue基础部分时做的笔记，整合删改了一些，又添加了一部分示例，基本涵盖了Vue基础知识，供参考，也可以直接看<a href="https://cn.vuejs.org/v2/guide/" target="_blank" rel="noopener">官方文档</a>的教程。我学习Vue时主要也是通过官方文档，把基础部分过一遍，示例代码手敲自己运行一下，刚开始可以先不深究原理，先掌握基础用法，在项目中碰到看不懂的代码再去查阅文档或请教恒哥。</h5></li>
</ul>
<hr>
<h1 id="Vue基础知识部分"><a href="#Vue基础知识部分" class="headerlink" title="Vue基础知识部分"></a>Vue基础知识部分</h1><h3 id="构造器"><a href="#构造器" class="headerlink" title="构造器"></a>构造器</h3><ul>
<li>实例化vue时，需传入一个选项对象，它可以包括 数据、模板、挂载元素、方法和生命周期钩子</li>
</ul>
<h3 id="属性与方法"><a href="#属性与方法" class="headerlink" title="属性与方法"></a>属性与方法</h3><ul>
<li>每个vue实例都会代理其data对象里所有的属性</li>
<li>vue实例暴露了一些有用的实例属性与方法，这些属性与方法都有前缀$，以便与代理的data属性区分</li>
</ul>
<h3 id="实例生命周期"><a href="#实例生命周期" class="headerlink" title="实例生命周期"></a>实例生命周期</h3><ul>
<li>created钩子——在实例被创建后被调用</li>
<li>mounted—-当编译好的HTML被挂载到对应的位置,这个操作完成后触发</li>
<li>updated—-当data中的数据改变,并且虚拟DOM重新渲染完成后触发</li>
<li>destroyed</li>
<li>概要: 钩子的this 指向调用它的实例</li>
</ul>
<h3 id="生命周期图示"><a href="#生命周期图示" class="headerlink" title="生命周期图示"></a>生命周期图示</h3><ul>
<li><a href="https://cn.vuejs.org/images/lifecycle.png" target="_blank" rel="noopener">https://cn.vuejs.org/images/lifecycle.png</a></li>
</ul>
<h3 id="插值"><a href="#插值" class="headerlink" title="插值"></a>插值</h3><ul>
<li>文本<ul>
<li>双大括号</li>
<li>v-text</li>
</ul>
</li>
<li>纯HTML<ul>
<li>v-html</li>
</ul>
</li>
<li>属性<ul>
<li>v-bind（大双括号不能在属性中使用，因此需使用v-bind）</li>
</ul>
</li>
<li>使用JavaScript表达式</li>
</ul>
<h3 id="指令"><a href="#指令" class="headerlink" title="指令"></a>指令</h3><ul>
<li><p>哪些指令?</p>
<ul>
<li>v-bind</li>
<li>v-on</li>
<li>v-if</li>
<li>v-for（特殊）</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line"> v-if </span><br><span class="line"> <div id="app"></span><br><span class="line"> <template v-if="ok==='username'"></span><br><span class="line"> 用户名: <input type="text" placeholder="请输入用户名" key="name-input"></span><br><span class="line"> </template></span><br><span class="line"> <template v-else></span><br><span class="line"> 密码: <input type="text" placeholder="请输入密码" key="psd-input"></span><br><span class="line"> </template></span><br><span class="line"> <button @click="toggle">点击切换类型</button></span><br><span class="line"></div></span><br><span class="line"></span><br><span class="line">new Vue({</span><br><span class="line"> el: "#app",</span><br><span class="line"> data: {</span><br><span class="line"> ok:'username'</span><br><span class="line"> },</span><br><span class="line"> methods: {</span><br><span class="line"> toggle: function(todo){</span><br><span class="line"> if(this.ok==='username'){</span><br><span class="line"> this.ok = 'psd'</span><br><span class="line"> }else{</span><br><span class="line"> this.ok = 'username';</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">})</span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"> v-for</span><br><span class="line"> <div id="app"></span><br><span class="line"> <ul></span><br><span class="line"> <li v-for="item in items">{{item}}</li></span><br><span class="line"> </ul></span><br><span class="line"></div></span><br><span class="line"></span><br><span class="line">new Vue({</span><br><span class="line"> el: "#app",</span><br><span class="line"> data: {</span><br><span class="line"> items:['a','b','c']</span><br><span class="line"> },</span><br><span class="line"> methods: {</span><br><span class="line"> toggle: function(todo){</span><br><span class="line"> todo.done = !todo.done</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">})</span><br></pre></td></tr></table></figure>
</li>
<li><p>修饰符</p>
<ul>
<li>v-on<ul>
<li>.stop 阻止单击事件冒泡 <a v-on:click.stop="doThis"></a></li>
<li>.prevent 提交事件不再重载页面 </li>
<li>.capture 添加事件侦听器时使用时间捕获模式</li>
<li>.self 只当事件在该元素本身（而不是子元素）触发时触发回调</li>
<li>等等</li>
</ul>
</li>
</ul>
</li>
</ul>
<h3 id="过滤器"><a href="#过滤器" class="headerlink" title="过滤器"></a>过滤器</h3><ul>
<li><p>过滤器的目的是用于文本转换,转化成你想要的格式</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line"> filters</span><br><span class="line"><div id="app"></span><br><span class="line"> <p>{{message | changeChar}}</p></span><br><span class="line"> <button @click="changeFirstChar">改变</button></span><br><span class="line"> </div></span><br><span class="line"></span><br><span class="line">new Vue({</span><br><span class="line"> el: "#app",</span><br><span class="line"> data: {</span><br><span class="line"> message:'nihao'</span><br><span class="line"> },</span><br><span class="line"> methods: {</span><br><span class="line"> changeFirstChar: function(todo){</span><br><span class="line"> this.message = 'good evening'</span><br><span class="line"> }</span><br><span class="line"> },</span><br><span class="line"> filters:{</span><br><span class="line"> changeChar(value){</span><br><span class="line"> if(!value){</span><br><span class="line"> return '';</span><br><span class="line"> }else{</span><br><span class="line"> return value.charAt(0).toUpperCase()+value.substring(1)</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> })</span><br></pre></td></tr></table></figure>
</li>
</ul>
<h3 id="缩写"><a href="#缩写" class="headerlink" title="缩写"></a>缩写</h3><ul>
<li><p>v-bind缩写</p>
<ul>
<li><p>原有： <a v-bind:href="url"></a> </p>
<p>缩写： <a :href="url"></a></p>
</li>
</ul>
</li>
<li><p>v-on缩写</p>
<ul>
<li><p>原有：<button v-on:click="doSomeThing"></button> </p>
<p>缩写：<button @click="doSomeThing"></button></p>
</li>
</ul>
</li>
</ul>
<h2 id="计算属性"><a href="#计算属性" class="headerlink" title="计算属性"></a>计算属性</h2><h3 id="计算属性（减少模板的复杂度）"><a href="#计算属性（减少模板的复杂度）" class="headerlink" title="计算属性（减少模板的复杂度）"></a>计算属性（减少模板的复杂度）</h3><ul>
<li>计算属性的基础写法</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"> computed</span><br><span class="line"><div id="app"></span><br><span class="line"> {{fullName}}</span><br><span class="line"></div></span><br><span class="line"></span><br><span class="line">new Vue({</span><br><span class="line"> el: "#app",</span><br><span class="line"> data: {</span><br><span class="line"> firstName:'wang',</span><br><span class="line"> lastName:'weiJiang'</span><br><span class="line"> },</span><br><span class="line"> computed:{</span><br><span class="line"> fullName(){</span><br><span class="line"> return this.firstName+'----'+this.lastName;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">})</span><br></pre></td></tr></table></figure>
<ul>
<li><p>计算缓存vs方法(Methods)</p>
<ul>
<li>计算属性computed具有缓存，而methods无缓存</li>
</ul>
</li>
<li><p>Computed属性vs 侦听器(Watch属性)</p>
<ul>
<li>watch方法–观察Vue实例上的数据变动,只要指定的数据改变就会执行预定的函数</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br></pre></td><td class="code"><pre><span class="line"> watch</span><br><span class="line"><div id="app"></span><br><span class="line"> {{msg}} <br> </span><br><span class="line"> 改变了吗? {{isChange}}</span><br><span class="line"> <button @click="change">改变</button></span><br><span class="line"></div></span><br><span class="line"></span><br><span class="line">new Vue({</span><br><span class="line"> el: "#app",</span><br><span class="line"> data: {</span><br><span class="line"> msg:'111',</span><br><span class="line"> isChange:'No'</span><br><span class="line"> },</span><br><span class="line"> watch:{</span><br><span class="line"> //只要msg改变,这个方法就会执行</span><br><span class="line"> msg(val,oldVal){</span><br><span class="line"> this.isChange = 'Yes'</span><br><span class="line"> }</span><br><span class="line"> },</span><br><span class="line"> methods:{</span><br><span class="line"> change(){</span><br><span class="line"> this.msg = '222'</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">})</span><br></pre></td></tr></table></figure>
<ul>
<li>computed方法</li>
</ul>
</li>
<li><p>计算setter 和getter</p>
<ul>
<li>get和set,顾名思义,一个是获得,一个是设置,常规上来讲,计算属性中都是有get和set方法的,默认是只有getter方法,如果需要的话,自然可以写一个setter方法.</li>
</ul>
</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line"> get和set</span><br><span class="line"><div id="app"></span><br><span class="line"> 此时的onpiece: {{onepiece}} <br></span><br><span class="line"> 此时的msg: {{msg}} <br><br></span><br><span class="line"> <button @click="setName">设置name</button></span><br><span class="line"></div> </span><br><span class="line"></span><br><span class="line">new Vue({</span><br><span class="line"> el: "#app",</span><br><span class="line"> data: {</span><br><span class="line"> name:'Kobe',</span><br><span class="line"> msg:''</span><br><span class="line"> },</span><br><span class="line"> methods:{</span><br><span class="line"> setName(){</span><br><span class="line"> this.onepiece = 'james'</span><br><span class="line"> }</span><br><span class="line"> },</span><br><span class="line"> computed:{</span><br><span class="line"> onepiece:{</span><br><span class="line"> get(){</span><br><span class="line"> return this.name +'Bryant';</span><br><span class="line"> },</span><br><span class="line"> set(newVal){</span><br><span class="line"> //当给onepiece设置值的时候set就就会调用</span><br><span class="line"> this.msg = newVal+'is the greatest basketball player';</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">})</span><br></pre></td></tr></table></figure>
<h2 id="class与style绑定"><a href="#class与style绑定" class="headerlink" title="class与style绑定"></a>class与style绑定</h2><h3 id="绑定HTML-class"><a href="#绑定HTML-class" class="headerlink" title="绑定HTML class"></a>绑定HTML class</h3><ul>
<li><p>对象语法</p>
<ul>
<li>基本</li>
<li>在对象中传入多个class属性（其会与原有class共存）</li>
<li>直接传入对象</li>
<li>与计算属性一起使用（绑定返回对象的计算属性）</li>
</ul>
</li>
<li><p>数组语法</p>
<ul>
<li>简单例子</li>
<li>三元表达式</li>
<li>当有多个条件class时，可以在数组语法中使用对象语法</li>
</ul>
</li>
<li><p>用在组件上</p>
<ul>
<li>简单例子</li>
<li>绑定HTML class例子</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"> 绑定class的几种方式</span><br><span class="line">.classC{</span><br><span class="line"> color:red;</span><br><span class="line">}</span><br><span class="line">.classD{</span><br><span class="line"> font-weight:bold;</span><br><span class="line">}</span><br><span class="line">.classE{</span><br><span class="line"> font-size:20px;</span><br><span class="line">}</span><br><span class="line">.classF{</span><br><span class="line"> color:blue;</span><br><span class="line">}</span><br><span class="line">.classM{</span><br><span class="line"> display:block;</span><br><span class="line">}</span><br><span class="line">.classN{</span><br><span class="line"> display:none;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><div id="app"></span><br><span class="line"> <h2>class属性绑定</h2></span><br><span class="line"> -------------------绑定变量-------------------------</span><br><span class="line"> <div :class="{classA:a,classB:b}"></span><br><span class="line"> 绑定变量</span><br><span class="line"> </div></span><br><span class="line"> -------------------绑定对象-------------------------</span><br><span class="line"> <div :class="styleObj"></span><br><span class="line"> 绑定对象</span><br><span class="line"> </div></span><br><span class="line"> -------------------绑定数组-------------------------</span><br><span class="line"> <div :class="arrClass"></span><br><span class="line"> 绑定数组</span><br><span class="line"> </div></span><br><span class="line"> -------------------绑定三元运算符-------------------------</span><br><span class="line"> <div :class="m==true?'classM':'classN'"></span><br><span class="line"> 绑定变量</span><br><span class="line"> </div></span><br><span class="line"> <button @click="toggle">toggle</button></span><br><span class="line"></div></span><br></pre></td></tr></table></figure>
</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line">new Vue({</span><br><span class="line"> el: "#app",</span><br><span class="line"> data: {</span><br><span class="line"> a:true,</span><br><span class="line"> b:false,</span><br><span class="line"> styleObj:{</span><br><span class="line"> classC:true,</span><br><span class="line"> classD:true</span><br><span class="line"> },</span><br><span class="line"> m:true,</span><br><span class="line"> arrClass:['classE','classF']</span><br><span class="line"> },</span><br><span class="line"> methods:{</span><br><span class="line"> toggle(){</span><br><span class="line"> this.m=!this.m;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">})</span><br></pre></td></tr></table></figure>
<h3 id="绑定内联样式"><a href="#绑定内联样式" class="headerlink" title="绑定内联样式"></a>绑定内联样式</h3><ul>
<li>对象语法<ul>
<li>内联式对象语法</li>
<li>样式对象式对象语法（更推荐）</li>
</ul>
</li>
<li>数组语法</li>
<li>自动添加前缀<ul>
<li>v-bind:style 当需要特定的前缀时如transform，vue.js会自动添加</li>
</ul>
</li>
<li>多重值<ul>
<li>可以为一个属性添加多个值的数组，常用于含有多个前缀的情况</li>
</ul>
</li>
</ul>
<h2 id="条件渲染"><a href="#条件渲染" class="headerlink" title="条件渲染"></a>条件渲染</h2><h3 id="v-if（v-else）是真正的渲染"><a href="#v-if（v-else）是真正的渲染" class="headerlink" title="v-if（v-else）是真正的渲染"></a>v-if（v-else）是真正的渲染</h3><ul>
<li><p>template元素与v-if</p>
</li>
<li><p>v-else（需要紧跟在v-if后边）</p>
</li>
<li><p>v-else-if</p>
</li>
<li><p>用key管理可复用的元素</p>
<ul>
<li>例子：用户名和邮箱登录界面 如果有key就不会复用,可以把key去试一下,然后输入看一下效果</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br></pre></td><td class="code"><pre><span class="line"><div id="app"></span><br><span class="line"> <template v-if="ok==='username'"></span><br><span class="line"> 用户名: <input type="text" placeholder="请输入用户名" key="name-input"></span><br><span class="line"> </template></span><br><span class="line"> <template v-else></span><br><span class="line"> 密码: <input type="text" placeholder="请输入密码" key="psd-input"></span><br><span class="line"> </template></span><br><span class="line"> <button @click="toggle">点击切换类型</button></span><br><span class="line"> </div></span><br><span class="line"> </span><br><span class="line"> new Vue({</span><br><span class="line"> el: "#app",</span><br><span class="line"> data: {</span><br><span class="line"> ok:'username'</span><br><span class="line"> },</span><br><span class="line"> methods: {</span><br><span class="line"> toggle: function(todo){</span><br><span class="line"> if(this.ok==='username'){</span><br><span class="line"> this.ok = 'psd'</span><br><span class="line"> }else{</span><br><span class="line"> this.ok = 'username';</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> })</span><br></pre></td></tr></table></figure>
</li>
</ul>
<h3 id="v-show（其只是简单的切换display属性）"><a href="#v-show（其只是简单的切换display属性）" class="headerlink" title="v-show（其只是简单的切换display属性）"></a>v-show（其只是简单的切换display属性）</h3><ul>
<li>v-show不支持template语法</li>
<li>v-show不支持v-else</li>
</ul>
<h3 id="v-if-VS-v-show"><a href="#v-if-VS-v-show" class="headerlink" title="v-if VS v-show"></a>v-if VS v-show</h3><ul>
<li>v-if<ul>
<li>当条件不成立时不会渲染</li>
<li>切换开销较大，适合不太可能变化的场景</li>
</ul>
</li>
<li>v-show<ul>
<li>无论成不成立都会渲染</li>
<li>首次渲染开销较大，但切换开销小，因此适合经常变化的场景</li>
</ul>
</li>
</ul>
<h2 id="列表渲染"><a href="#列表渲染" class="headerlink" title="列表渲染"></a>列表渲染</h2><h3 id="v-for"><a href="#v-for" class="headerlink" title="v-for"></a>v-for</h3><ul>
<li>基本用法<ul>
<li>简单例子</li>
<li>带有index参数</li>
<li>使用of 替代 in</li>
</ul>
</li>
<li>template v-for<ul>
<li>简单例子</li>
</ul>
</li>
<li>对象迭代 v-for<ul>
<li>基础用法</li>
<li>带其他参数用法</li>
</ul>
</li>
<li>整数迭代 v-for<ul>
<li>例子</li>
</ul>
</li>
<li>组件和v-for<br>包含所有类型的例子</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br></pre></td><td class="code"><pre><span class="line"> <template></span><br><span class="line"> <div id="app"></span><br><span class="line"> <hr></span><br><span class="line"> <strong style="border:2px solid #ccc;">遍历数组:</strong></span><br><span class="line"> <ul></span><br><span class="line"> <li v-for="item in items" >{{item}}</li></span><br><span class="line"> </ul></span><br><span class="line"> <hr></span><br><span class="line"> <strong style="border:2px solid #ccc;">遍历对象数组:</strong></span><br><span class="line"> <ul></span><br><span class="line"> <li v-for="(item,index) in pers">{{index}}--我是{{item.name}},今年{{item.age}}岁</li></span><br><span class="line"> </ul></span><br><span class="line"> <hr></span><br><span class="line"> <strong style="border:2px solid #ccc;">遍历对象:</strong></span><br><span class="line"> <ul></span><br><span class="line"> <li v-for="(value,key) in obj"></span><br><span class="line"> key:{{key}} |</span><br><span class="line"> value:{{value}}</span><br><span class="line"> </li></span><br><span class="line"> </ul></span><br><span class="line"> </div></span><br><span class="line"> </template></span><br><span class="line"></span><br><span class="line"><script></span><br><span class="line"> new Vue({</span><br><span class="line"> el: "#app",</span><br><span class="line"> data: {</span><br><span class="line"> isOK:'true',</span><br><span class="line"> items:['香蕉','苹果','烤肉'],</span><br><span class="line"> pers:[{</span><br><span class="line"> name:'Kobe',</span><br><span class="line"> age:'40'</span><br><span class="line"> },</span><br><span class="line"> {</span><br><span class="line"> name:'James',</span><br><span class="line"> age:'38' </span><br><span class="line"> }],</span><br><span class="line"> obj:{</span><br><span class="line"> 1:'one',</span><br><span class="line"> 2:'two'</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> })</span><br><span class="line"> </script></span><br></pre></td></tr></table></figure>
<h3 id="key"><a href="#key" class="headerlink" title="key"></a>key</h3><ul>
<li><p>作用</p>
<ul>
<li>用v-for更新已渲染过的列表时，它默认采用的是“就地复用”的原则，也就是如果数据项顺序发生了改变，vue将不是移动DOM元素来匹配数据项的顺序，而是简单复用此处的元素。如果想跟踪每个节点的身份，从而重用或重新排列现有元素，可使用key。</li>
</ul>
</li>
<li><p>key有什么用,</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><div id="app"></span><br><span class="line"> KEY: <input type="text" v-model="id"> VALUE: <input type="text" v-model="name"></span><br><span class="line"> <button @click="add">添加</button></span><br><span class="line"> <ul></span><br><span class="line"><li v-for="item in list" :key="item.id"> //此处你可以吧key去了,先勾选一条,在追加一条试一下,然后加上key,勾选一条追加一条再试一下,一目了然</span><br><span class="line"> <input type="checkbox" ></span><br><span class="line"> {{item.id}}---{{item.name}}</span><br><span class="line"></li></span><br><span class="line"> </ul></span><br><span class="line"></div></span><br></pre></td></tr></table></figure>
</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line">new Vue({</span><br><span class="line"> el: "#app",</span><br><span class="line"> data: {</span><br><span class="line"> id:"",</span><br><span class="line"> name:"",</span><br><span class="line"> list:[</span><br><span class="line"> {id:1, name:'李斯'},</span><br><span class="line"> {id:2, name:'嬴政'},</span><br><span class="line"> {id:3, name:'赵高'},</span><br><span class="line"> {id:4, name:'韩非'},</span><br><span class="line"> {id:5, name:'荀子'},</span><br><span class="line"> ]</span><br><span class="line"> },</span><br><span class="line"> methods: {</span><br><span class="line"> add: function(){</span><br><span class="line"> this.list.unshift({id:this.id,name:this.name})</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">})</span><br></pre></td></tr></table></figure>
<p>因为加上key默认采取的就是就地复用策略<br> <figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">### 数组更新检测</span><br><span class="line"></span><br><span class="line">- 变异方法（会改变原有数组）</span><br><span class="line"></span><br><span class="line"> - push（）</span><br><span class="line"> - pop（）</span><br><span class="line"> - shift（）</span><br><span class="line"> - unshift（）</span><br><span class="line"> - splice（）</span><br><span class="line"> - sort（）</span><br><span class="line"> - reverse（）</span><br><span class="line"></span><br><span class="line">- 重塑数组</span><br><span class="line"></span><br><span class="line"> - filter（）</span><br><span class="line"> - concat（）</span><br><span class="line"> - slice（）</span><br><span class="line"></span><br><span class="line">- 注意事项</span><br><span class="line"> 利用索引直接设置一个项时，vue不能检测变动，如：vm.items[indexOfItem] = newValue</span><br><span class="line"> 如果要设置某一项</span><br></pre></td></tr></table></figure></p>
<ul>
<li>Vue.set(example1.items, indexOfItem, newValue)</li>
<li><p>example1.items.splice(indexOfItem, 1, newValue)</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"></span><br></pre></td></tr></table></figure>
</li>
</ul>
<div id="app"><br> <button @click="setZF">设置第二项为张飞</button><br> <button @click="setGY">设置第三项为关羽</button><br> <ul><br> <li v-for="item in list"><br> <input type="checkbox"><br> —<br> </li><br> </ul><br></div>
<p>var vmm = new Vue({<br> el: “#app”,<br> data: {<br> id:””,<br> name:””,<br> list:[<br> {id:1, name:’李斯’},<br> {id:2, name:’嬴政’},<br> {id:3, name:’赵高’},<br> {id:4, name:’韩非’},<br> {id:5, name:’荀子’},<br> ]<br> },<br> methods: {<br> setZF: function(){<br> Vue.set(this.list,1,{id:2,name:’张飞’})<br> },<br> setGY:function(){<br> this.list.splice(2,1,{id:3,name:’关羽’})<br> }<br> }<br>})</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"></span><br></pre></td></tr></table></figure>
<ul>
<li>修改数组长度时，vue不能检测变动，如：vm.items.length = newLength</li>
<li>只能用example1.items.splice(newLength)</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">### 对于显示过滤/排序结果的两种方法</span><br><span class="line"></span><br><span class="line">- 过滤数组--计算属性computed例子</span><br><span class="line"></span><br><span class="line">- 过滤数组--方法methods例子</span><br></pre></td></tr></table></figure>
<pre><code>计算属性应用于过滤
</code></pre> <div id="app"><br> <br> </div>
<p> new Vue({<br> el: “#app”,<br> data: {<br> nums:[1,2,3,4,5,6,7,8,9]<br> },<br> computed:{<br> specialNum(){<br> return this.nums.filter((item,index)=>{<br> return item%3==0;<br> })<br> }<br> }<br> })</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"></span><br></pre></td></tr></table></figure>
<div id="app"><br> <ul><br> <li v-for="item in fil(numbers)"></li> //在v-for循环中直接嵌入方法<br> </ul><br> </div>
<p> new Vue({<br> el: “#app”,<br> data: {<br> numbers:[1,2,3,4,5,6,7,8,9]<br> },<br> methods:{<br> fil(nums){<br> return nums.filter((item,index)=>{<br> return item%3==0;<br> })<br> }<br> }<br> })</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">## 两个简单的事件处理器</span><br></pre></td></tr></table></figure>
<p>1</p>
<div id="app"><br> <button @click="num+=1">增加1</button><br> <br></div>
<hr>
<p>2 </p>
<div id="app"><br> <button @click="sayHello">点击sayHello</button><br></div><br>new Vue({<br> el: “#app”,<br> methods: {<br> sayHello: function(){<br> alert(‘sayHello’)<br> }<br> }<br>})<br><br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">### 内联处理器方法</span><br><span class="line"></span><br><span class="line">- 访问原生DOM事件的例子,如果click事件不传参数,就默认把原生DOM传递进去</span><br></pre></td></tr></table></figure><br><br> <div id="app"> //没有传参数,就是原生的!!!<br> <button @click="showBtnname">显示按钮的名字</button> <br><br><br> <br> </div>
<p> new Vue({<br> el: “#app”,<br> data: {<br> msg:’’<br> },<br> methods: {<br> showBtnname: function(e){<br> this.msg = e.target.innerText;<br> }<br> }<br> })</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- 未访问原生DOM事件的例子,如果传了参数.那么方法中接受的第一个参数就是该参数,在vue中所有的事件绑定都是这样的</span><br></pre></td></tr></table></figure>
<p> —————————-html———————————<br> <div id="app"><br> <h2>Todos:</h2><br> <ol><br> <li v-for="todo in todos"><br> <label><br> <input type="checkbox" v-on:change="toggle(todo)" v-bind:checked="todo.done"></label></li></ol></div></p>
<pre><code> <del v-if="todo.done">
{{ todo.text }}
</del>
<span v-else>
{{ todo.text }}
</span>
</label>
</li>
</ol>
</code></pre><p> <br> —————————-js———————————<br> new Vue({<br> el: “#app”,<br> data: {<br> todos: [<br> { text: “Learn JavaScript”, done: false },<br> { text: “Learn Vue”, done: false },<br> { text: “Play around in JSFiddle”, done: true },<br> { text: “Build something awesome”, done: true }<br> ]<br> },<br> methods: {<br> toggle: function(todo){<br> todo.done = !todo.done<br> }<br> }<br> })<br> —————————-css———————————<br> body {<br> background: #20262E;<br> padding: 20px;<br> font-family: Helvetica;<br> }</p>
<p> #app {<br> background: #fff;<br> border-radius: 4px;<br> padding: 20px;<br> transition: all 0.2s;<br> }</p>
<p> li {<br> margin: 8px 0;<br> }</p>
<p> h2 {<br> font-weight: bold;<br> margin-bottom: 15px;<br> }</p>
<p> del {<br> color: rgba(0, 0, 0, 0.3);<br> }</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">### 事件修饰符</span><br><span class="line"></span><br><span class="line">- .stop</span><br><span class="line"> - 阻止单击事件冒泡</span><br><span class="line">- .prevent</span><br><span class="line"> - 提交事件不再重载页面</span><br><span class="line">- .capture</span><br><span class="line"> - 使用事件捕获模式</span><br><span class="line">- .self</span><br><span class="line"> - 只有当事件在该元素本身被触发时（不包含子元素）才触发回调</span><br><span class="line">- .once</span><br><span class="line"> - 事件只触发一次（vue 2.1.4新增）</span><br><span class="line">- 修饰符串联</span><br><span class="line"> - 例子</span><br><span class="line"></span><br><span class="line">### 按键修饰符</span><br><span class="line"></span><br><span class="line">- .enter</span><br><span class="line"></span><br><span class="line"> - keyCode</span><br><span class="line"> - .enter</span><br><span class="line"></span><br><span class="line">- .tab</span><br><span class="line"></span><br><span class="line">- .delete</span><br><span class="line"></span><br><span class="line"> - (捕获 “删除” 和 “退格” 键)</span><br><span class="line"></span><br><span class="line">- .esc</span><br><span class="line"></span><br><span class="line">- .space</span><br><span class="line"></span><br><span class="line">- .up</span><br><span class="line"></span><br><span class="line">- .down</span><br><span class="line"></span><br><span class="line">- .left</span><br><span class="line"></span><br><span class="line">- .right</span><br><span class="line"></span><br><span class="line">- 组合使用,单独是使用的话,和click都是一样的,这里组合使用有点特殊,使用 . 进行连接简单给个例子</span><br></pre></td></tr></table></figure>
<div id="app"><br> <button @click.ctrl="num++">num+1</button><br> <br> </div>
<p> new Vue({<br> el: “#app”,<br> data: {<br> num:0<br> }<br> })</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">### vue2.1.0新增 按键修饰符</span><br><span class="line"></span><br><span class="line">- .ctrl</span><br><span class="line">- .alt</span><br><span class="line">- .shift</span><br><span class="line">- .meta</span><br><span class="line"></span><br><span class="line">## 表单控件绑定</span><br><span class="line"></span><br><span class="line">### 基础用法</span><br><span class="line"></span><br><span class="line">- 文本</span><br></pre></td></tr></table></figure>
<div id="app"><br> <h2></h2><br> <br><br> <input type="text" v-model="msg"><br> </div>
<p> new Vue({<br> el: “#app”,<br> data: {<br> msg:’万年的msg’<br> }<br> })</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- 多行文本---在文本区域插值( `<textarea></textarea>` ) 并不会生效，应用 `v-model` 来代替</span><br></pre></td></tr></table></figure>
<div id="app"><br> <p style="white-space: pre"><br> <br> </p><br> <br><br> <textarea type="text" v-model="msg"></textarea><br> </div>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- 复选框</span><br><span class="line"></span><br><span class="line"> - 单个复选框(直接绑定true,false)</span><br></pre></td></tr></table></figure>
<pre><code><div id="app">
<input type="checkbox" id="checkbox" v-model="checked">
<label for="checkbox">{{ checked }}</label>
</div>
new Vue({
el: "#app",
data: {
checked:true
}
})
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- 多个复选框(将选中的所有value绑定到一个数组)</span><br></pre></td></tr></table></figure>
<div id="app">
<input type="checkbox" id="jack" value="Jack" v-model="checkedNames">
<label for="jack">Jack</label>
<input type="checkbox" id="john" value="John" v-model="checkedNames">
<label for="john">John</label>
<input type="checkbox" id="mike" value="Mike" v-model="checkedNames">
<label for="mike">Mike</label>
<br>
{{checkedNames}}
</div>
new Vue({
el: "#app",
data: {
checkedNames:[]
}
})
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- 单选按钮(绑定选中的单选框的value)</span><br></pre></td></tr></table></figure>
</code></pre> <div id="app"><br> <input type="radio" id="one" value="One" v-model="picked"><br> <label for="one">One</label><br> <br><br> <input type="radio" id="two" value="Two" v-model="picked"><br> <label for="two">Two</label><br> <br><br> <span>Picked: </span><br> </div>
<p> new Vue({<br> el: “#app”,<br> data: {<br> picked:’’<br> }<br> })</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- 选择列表(不管是单选还是多选,v-model都要绑定到select元素上)</span><br><span class="line"></span><br><span class="line"> - 单选列表(绑定到被选中项的value)</span><br></pre></td></tr></table></figure>
<pre><code><div id="app">
<select v-model="selected">
<option>A</option>
<option>B</option>
<option>C</option>
</select>
<span>Selected: {{ selected }}</span>
</div>
new Vue({
el: "#app",
data: {
selected:''
}
})
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- 多选列表(绑定一个数组,数组的内容是所有的选中项的value)</span><br></pre></td></tr></table></figure>
<div id="app">
<select v-model="selected" multiple>
<option>A</option>
<option>B</option>
<option>C</option>
</select>
<br>
<span>Selected: {{ selected }}</span>
</div>
new Vue({
el: "#app",
data: {
selected: []
}
})
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- 动态选项</span><br></pre></td></tr></table></figure>
<div id="app">
<select v-model="selected">
<option v-for="option in options" v-bind:value="option.value">
{{ option.text }}
</option>
</select>
<span>Selected: {{ selected }}</span>
</div>
new Vue({
el: "#app",
data: {
selected: 'A',
options: [
{ text: 'One', value: 'A' },
{ text: 'Two', value: 'B' },
{ text: 'Three', value: 'C' }
]
}
})
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">### 修饰符</span><br><span class="line"></span><br><span class="line">- .lazy</span><br><span class="line"></span><br><span class="line"> - 由原有的input事件变更为change事件</span><br></pre></td></tr></table></figure>
<div id="app">
<input type="text" v-model.lazy="msg">
{{msg}}
</div>
new Vue({
el: "#app",
data: {
msg:'万年的msg'
}
})
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- .number</span><br><span class="line"></span><br><span class="line"> - 将输入的类型转换成数字类型（NaN则还是原有类型）</span><br><span class="line"></span><br><span class="line">- .trim</span><br><span class="line"></span><br><span class="line"> - 去除两端空白</span><br><span class="line"></span><br><span class="line"> </span><br><span class="line"></span><br><span class="line">### v-model与组件</span><br><span class="line"></span><br><span class="line">## 组件</span><br><span class="line"></span><br><span class="line">### 使用组件</span><br><span class="line"></span><br><span class="line">- 注册</span><br><span class="line"></span><br><span class="line"> - 注意事项</span><br><span class="line"></span><br><span class="line"> - 在初始化根实例前一定要确保注册了组件！！！！</span><br><span class="line"> - 名称最好 小写（可以使用短杆）</span><br></pre></td></tr></table></figure>
<div id="app">
<my-comp></my-comp>
</div>
Vue.component('my-comp',{
template:'<h3>我是新出炉的组件</h3>'
})
new Vue({
el: "#app",
data: {
}
})
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- 局部注册</span><br></pre></td></tr></table></figure>
</code></pre> <div id="app"><br> <my-comp></my-comp><br> </div>
<p> new Vue({<br> el: “#app”,<br> components:{<br> ‘my-comp’:{template:’</p><h3>我是新出炉的组件</h3>‘}<br> },<br> data: {<p></p>
<pre><code>}
</code></pre><p> })</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- DOM模板解析说明</span><br><span class="line"></span><br><span class="line"> - 自定义组件在这些元素内受限</span><br><span class="line"></span><br><span class="line"> - ul</span><br><span class="line"></span><br><span class="line"> - ol</span><br><span class="line"></span><br><span class="line"> - table</span><br><span class="line"></span><br><span class="line"> - select</span><br><span class="line"></span><br><span class="line"> - 概要: 解决方案是 使用 特殊的is属性</span><br></pre></td></tr></table></figure>
<pre><code> <div id="app">
<table>
<tr>
<my-comp></my-comp>//注意:这样写是绝对错误的,因为tr中只允许有td,这样写他是不认识滴
</tr>
</table>
</div>
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx 上边是错误的
---------------------------------下边是正确的-----------------------------------
<div id="app">
<table>
<tr>
<td is="my-comp"></td>
</tr>
</table>
</div>
new Vue({
el: "#app",
components:{
'my-comp':{
template:'<td>我是组件td</td>'
}
},
data: {
}
})
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- 不受限的情况--使用字符串模板</span><br><span class="line"></span><br><span class="line"> - <script type="text/x-template"> 怎么用呢?给大家来个例子吧!</span><br></pre></td></tr></table></figure>
-------------------------------HTML-----------------------------------------
<div id="app">
<table>
<tr>
<template>
<my-comp></my-comp>
</template>
</tr>
</table>
</div>
<script type="text/x-template" id="myComponent">
<td>This is a component!</td>
</script>
-----------------------------------JS----------------------------------
new Vue({
el: "#app",
components:{
'my-comp':{
template:'#myComponent'
}
},
data: {
}
})
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- JavaScript内联模板字符串(什么是字符串模板)</span><br></pre></td></tr></table></figure>
<div id="app">
<table>
<tr>
<template> //这个就是字符串模板
<my-comp></my-comp>
</template>
</tr>
</table>
</div>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"> - .vue组件 (第三种)</span><br><span class="line"></span><br><span class="line">- data必须是函数,在组件中使用data中定义的数据,必须使用函数返回,我自己的理解,最根本的三个字就是作用域,目的就是为了防止组件中使用的data和vue实例中的data进行相互污染,</span><br></pre></td></tr></table></figure>
<div id="app">
<mycomp></mycomp>
</div>
new Vue({
el: "#app",
components:{
'mycomp':{
template:'<button>{{btncount}}</button>',
data(){
return {btncount:8}
}
}
},
data:{
btncount:10
}
})
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">### Prop（子组件从父组件获得数据）</span><br><span class="line"></span><br><span class="line">- 使用prop传递数据</span><br></pre></td></tr></table></figure>
<div id="app">
<child msg="我是来自于父组件的内容"></child>
</div>
new Vue({
el: "#app",
components:{
'child':{
props:['msg'],
template:'<h2>{{msg}}</h2>'
}
}
})
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"></span><br></pre></td></tr></table></figure>
动态绑定父组件中的数据
<div id="app">
<input type="text" v-model="fathertext">
{{fathertext}}
<child :childText="fathertext"></child>
</div>
new Vue({
el: "#app",
components:{
'child':{
props:['childtext'],
template:'<h1>{{childtext}}</h1>'
}
},
data: {
fathertext:''
}
})
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"> - </span><br><span class="line"></span><br><span class="line"> - props注意事项</span><br><span class="line"></span><br><span class="line"> - 一般情况下是数组形式，如果要想规定props的数据类型（后面用中括号 [ ]）。默认值等（props验证），则是对象了（后面用花括号 { }）</span><br><span class="line"></span><br><span class="line">- 关于命名:要不然全小写,要不然kebabCase（驼峰式),kebab-case（短横线隔开式）Vue 能够正确识别出小驼峰和下划线命名法混用的变量，如这里的`forChildMsg`和`for-child-msg`是同一值。 </span><br><span class="line"></span><br><span class="line">- 动态Prop（使用v-bind）:在模板中，要动态地绑定父组件的数据到子组件模板的 props，和绑定 Html 标签特性一样，使用v-bind绑定 </span><br><span class="line"></span><br><span class="line"> - 局部注册组件</span><br><span class="line"> - 全局注册组件</span><br><span class="line"></span><br><span class="line">- 字面量语法vs动态语法</span><br><span class="line"></span><br><span class="line">- 单向数据流</span><br><span class="line"></span><br><span class="line"> - 解释</span><br><span class="line"></span><br><span class="line"> - 父组件数据更新后，子组件的所有prop都会更新为最新值，但是反过来就不会。（注意 ：如果prop为数组或对象时，子组件改变prop，父组件的状态也会受到影响，因为数组或对象是引用类型，他们指向同一个内存空间。）如果子组件的prop值被修改，则vue会给出警告。</span><br></pre></td></tr></table></figure>
<div id="app">
<parent></parent>
</div>
let childNode = {
template: `
<div class="child">
<div>
<span>子组件数据</span>
<input v-model="forChildMsg"/>
</div>
<p>{{forChildMsg}}</p>
</div>`,
props: {
"for-child-msg": String
}
};
let parentNode = {
template: `
<div class="parent">
<div>
<span>父组件数据</span>
<input v-model="msg"/>
</div>
<p>{{msg}}</p>
<child :for-child-msg="msg"></child>
</div>
`,
components: {
child: childNode
},
data() {
return {
msg: "default string."
};
}
};
new Vue({
el: "#app",
components:{
parent:parentNode
}
})
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- 特殊情况应对方法</span><br><span class="line"></span><br><span class="line"> - prop作为初始值传入后，可能子组件想把它当做局部数据来用的情况</span><br><span class="line"></span><br><span class="line"> - 方法：定义一个局部变量，并用prop的值初始化它</span><br></pre></td></tr></table></figure>
props: ['initialCounter'],
data: function () {
return { counter: this.initialCounter }
}
//直接使用counter作为子组件的局部变量就可以了
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- prop作为初始值传入，可能子组件处理成其他数据输出的情况,比如处理成去空格并大写</span><br><span class="line"></span><br><span class="line"> - 方法：定义一个计算属性，处理prop的值并返回</span><br></pre></td></tr></table></figure>
props: ['size'],
computed: {
normalizedSize: function () {
return this.size.trim().toLowerCase()
}
}
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- prop验证</span><br><span class="line"></span><br><span class="line"> - 例子</span><br></pre></td></tr></table></figure>
Vue.component('example', {