使用两张图片拼起来，数字就是 0、1、2、3、4、5、6、7、8、9、0、1、2、3、4、5、6、7、8、9 1.使用偏移量移动化的方式往上偏移 2.当偏移的数字大于上次的数组就正常偏移 3.第二次数字小于上次的数字，就要持续往上偏移到指定数字 4.之后再把偏移的位置设置到最初的位置上
目前是一直往上滚动切换数字
利用 transform 的 translateY 偏移和 transition 动画来实现
代码中注释很清楚，不懂的可以评论区或者私信我
还有一种实现方式是使用 transform: transationY + background-position 锚点来实现，具体实现可以自己尝试下
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