textContent会获取节点中除注释外子节点的内容，包含script和style，而innertext只会返回节点的纯文本内容，不包含script和style,具体可以看代码输出结果：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum=1.0,minimum=1.0,user-scalable=0" />
</head>
<body>
<div id="mylinks">
This is my <b>link collection</b>:
<ul>
<style>ul{
list-style: none;
}
</style>
<!--dd -->
<script>alert("test");</script>
<li><a href="www.bfw.wiki">Bye bye <b>Bfw</b> </a></li>
<li><a href="code.biw.wiki">Welcome to <b>Bfw.wiki</b></a></li>
</ul>
</div>
<script type="text/javascript">
var obj=document.getElementById("mylinks");
console.log(obj.innerHTML);
console.log(obj.innerText);
console.log(obj.textContent);
</script>
</body>
</html>
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