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树形层次，从1开始计数
<!doctype html>
<html lang="en" class="1">
<head class="2">
<meta charset="UTF-8">
<title>Document</title>
</head>
<body class="2">
<div class="3">
<div class="4"></div>
<div class="4">
<div class="5">
<div class="6"></div>
<div class="6"></div>
<div class="6"></div>
<div class="6"></div>
</div>
</div>
</div>
<div class="3">
<div class="4"></div>
</div>
</body>
</html>
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原文地址：http://www.cnblogs.com/htmlphp/p/5022523.html
