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Task_22.html
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<!DOCTYPE>
<html>
<head>
<meta charset="utf-8">
<title>IFE JavaScript Task 22</title>
<script src="js/task-22.js"></script>
<style>
* {
font-family: "Microsoft YaHei UI", sans-serif;
}
div {
display: flex;
justify-content: space-around;
align-items: center;
border: 2px solid;
border-radius: 50%;
background-color: #fff;
-webkit-transition: all .5s ease-in-out;
-moz-transition: all .5s ease-in-out;
-o-transition: all .5s ease-in-out;
transition: all .5s ease-in-out;
}
.one {
width: 800px;
height: 800px;
border-color: aqua;
float: left;
}
.two {
width: 350px;
height: 350px;
border-color: gold;
}
.three {
width: 150px;
height: 150px;
border-color: blueviolet;
}
.four {
width: 60px;
height: 60px;
border-color: brown;
}
#choose {
text-align: center;
border-radius: 20px;
}
button {
outline: none;/*Chrome下讨厌的东西*/
border: none;
width: 120px;
height: 50px;
border-radius: 20px;
background: black;
color: white;
-webkit-transition: all .5s ease-in-out;
-moz-transition: all .5s ease-in-out;
-o-transition: all .5s ease-in-out;
transition: all .5s ease-in-out;
}
button:hover {
cursor: pointer;
background: gray;
color: orangered;
}
</style>
</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>
<fieldset id="choose">
<legend>选项卡</legend>
<p>Tips：有些骚年写了二叉树的深度优先遍历，科普下二叉树的先序、中序和后序遍历其实都是二叉树的深度优先遍历的特例，访问节点的顺序一样，只不过进栈顺序不同</p>
<button id="preOrder">先序遍历</button>
<button id="inOrder">中序遍历</button>
<button id="postOrder">后序遍历</button>
<button id="BFS">层次遍历</button>
</fieldset>
</body>
</html>