js如何监听dom节点内容发生变化进行回调通知？
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<style type="text/css">
#el-test{
line-height: 100px;
width: 200px;
border: #e5e5e5 solid 1px;
text-align: center;
}
</style>
</head>
<body>
<div class="el-test">元数据</div>
<div id="btn"BfwOnclick="setbtn();">改变</div>
<script type="text/javascript">
function setbtn(){
var targetNode= document.getElementsByClassName("el-test")[0];
targetNode...点击查看剩余70%
by thinkfuture
我知道答案，我要回答
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