<!DOCTYPE?HTML>
<html>
<head>
<meta?http-equiv="Content-Type"?content="text/html;?charset=utf-8">
<title>無標(biāo)題文檔</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");
??//?在此完成該函數(shù)
??for(var?i=content.childNodes.length-1;i>=0;i--){
??????var?x=content.removeChild(content.childNodes[i]);
??????document.write("刪除節(jié)點:"+x.innerHTML+"<br>");
??}?
}
</script>
<button?onclick="clearText()">清除節(jié)點內(nèi)容</button>
</body>
</html>
為何點擊按鈕后輸出許多undefined？代碼如下：
yuqingzhijie3596863
2016-09-10 16:06:47
