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task022.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>IFE-task022</title>
<link rel="stylesheet" href="task022.css">
</head>
<body>
<div class="first" id="one">
<div class="second" id="two">
<div class="third" id="four">
<div class="fourth" id="eight"></div>
<div class="fourth" id="nine"></div>
</div>
<div class="third" id="five">
<div class="fourth" id="ten"></div>
<div class="fourth" id="eleven"></div>
</div>
</div>
<div class="second" id="three">
<div class="third" id="six">
<div class="fourth" id="twelve"></div>
<div class="fourth" id="thirteen"></div>
</div>
<div class="third" id="seven">
<div class="fourth" id="fourteen"></div>
<div class="fourth" id="fifteen"></div>
</div>
</div>
</div>
<div class="buttons">
<button id="root">前序</button>
<button id="left">中序</button>
<button id="right">后序</button>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script src="task022.js"></script>
</body>
</html>