<!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">
var content=document.getElementById("content");
function clearText() {
// 在此完成该函数
var a=document.getElementById("a");
var i=content.removeChild(content.childNodes[0]);
a.innerHTML=i.innerHTML
}
function clearText1(){
var arr=new Array();
for(var i=0;i<content.childNodes.length;i++){
arr[i]=content.removeChild(content.childNodes[0]);
}
document.getElementById("a").innerHTML=content.childNodes.length;
}
</script>
<button onclick="clearText1()">清除节点内容</button>
<p id="a">擦</p>
</body>
</html>
损失函数
桑榆非晚1989
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