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tree.html
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tree.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>javascript和数</title>
<link rel="stylesheet" type="text/css" href="style/tree.css">
<script type="text/javascript" src="style/tree.js"></script>
</head>
<body>
<div class="one">
<div class="two">
<div class="three">
<div class="four"></div>
<div class="four"></div>
</div>
<div class="three">
<div class="four"></div>
<div class="four"></div>
</div>
</div>
<div class="two">
<div class="three">
<div class="four"></div>
<div class="four"></div>
</div>
<div class="three">
<div class="four"></div>
<div class="four"></div>
</div>
</div>
</div>
<div class="button">
<input type="submit" name="" id="pre" value="先序遍历">
<input type="submit" name="" id="in" value="中序遍历">
<input type="submit" name="" id="post" value="后序遍历">
</div>
</body>
</html>