以前看了JS方面的书，如今用到了，书看得再多，不用就忘了，所以经常用用你所学到的知识，温故知新。
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
<title>###</title>
<meta keywords="商品目录"/>
<meta description="JS查找孩子节点"/>
<script type="text/javascript">
function getContent()
{
var x=document.getElementById("content");
for(var i=0;i<x.childNodes.length;i++)
{
if((content=x.childNodes[i].innerHTML)=="目录")
{
var next=x.childNodes[i].nextSibling.nextSibling.textContent;
alert(next);
}
}
}
window.onload=getContent;
</script>
</head>
<body>
<div id="content">
<h3>商品</h3>
<div id="1">
<p >this is the first paragragh</p>
</div>
<h3>作者</h3>
<div id="2">
<p>this is the second paragragh</p>
</div>
<h3>目录</h3>
<div id="3">
<p>this is the third paragragh</p>
</div>
</div>
</body>
</html>
还需要努力和实践，坚持，加油。