删除节点removeChild（）
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
</head>
<body>
<div id="content">
<h1>html</h1>
<h1>php</h1>
<h1>javascript</h1>
<h1>jquery</h1>
<h1>java</h1>
</div>
<script type="text/javascript">
function clearText() {
//获取指定节点
var content=document.getElementById("content");
//实现删除
for(var i=0;i<content.children.length;i++){
content.removeChild(content.lastElementChild);
//点击一次后停止循环
break;
}
}
</script>
<button onclick="clearText()">清除节点内容</button>
</body>
</html>
