Element：元素对象，标签对象，枝叶
创建
通过document获取和创建
方法
①removeAttribute()：删除属性
②setAttribute()：设置属性
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<a>点我试试</a>
<input id="set" type="button" value="设置属性">
<input id="remove" type="button" value="删除属性">
<script>
//获取按钮
var set = document.getElementById("set");
set.onclick=function () {
//1.获取a标签
var a = document.getElementsByTagName("a")[0];
a.setAttribute("href","https://cn.bing.com/?FORM=Z9FD1");
}
//获取按钮
var remove = document.getElementById("remove");
remove.onclick=function () {
//1.获取a标签
var a = document.getElementsByTagName("a")[0];
a.removeAttribute("href");
}
</script>
</body>
</html>