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JS
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
</head>
<body>
<input id="first-number" type="number" value="0" placeholder="第一个数字">
<input id="second-number" type="number" value="0" placeholder="第二个数字">
<button id="add-btn">加</button>
<button id="minus-btn">减</button>
<button id="times-btn">乘</button>
<button id="divide-btn">除</button>
<p id="result">运算结果</p>
<script>
var add = document.getElementById("add-btn");
var minus = document.getElementById("minus-btn");
var times = document.getElementById("times-btn");
var divide = document.getElementById("divide-btn");
var result = document.getElementById("result");
add.onclick = function() {
var first = parseInt(document.getElementById("first-number").value);
var second = parseInt(document.getElementById("second-number").value);
result.innerHTML = second + first;
}
minus.onclick = function() {
var first = parseInt(document.getElementById("first-number").value);
var second = parseInt(document.getElementById("second-number").value);
result.innerHTML = second - first;
}
times.onclick = function() {
var first = parseInt(document.getElementById("first-number").value);
var second = parseInt(document.getElementById("second-number").value);
result.innerHTML = second * first;
}
divide.onclick = function() {
var first = parseInt(document.getElementById("first-number").value);
var second = parseInt(document.getElementById("second-number").value);
result.innerHTML = second / first;
}
</script>
</body>
</html>