<!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() {
var content=document.getElementById("content");
// 在此完成该函数
var num = content.childNodes.length;
function reduce(){
if(content.childNodes.length>0){
content.removeChild(content.firstChild);
reduce();
}
}
reduce()
}
</script>
<button onclick="clearText()">清除节点内容</button>
</body>
</html>
js脚本最好放在head里