今天主要是修改了下学习笔记，扩展了一下之前的笔记，同时复习了下浮动、float属性以及相关的知识点，以及JS相关的代码逻辑~~~
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下面是有关浮动的复习
代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
<title>网页标题</title>
<meta name="keywords" content="关键字列表" />
<meta name="description" content="网页描述" />
<link rel="stylesheet" type="text/css" href="" />
<style type="text/css">
._box{
300px;
margin:0 auto;
}
._div1
{
100px;
height:100px;
background-color:blue;
float:left;
}
._div2{
100px;
height:100px;
background-color:red;
float:left;
}
._div3{
100px;
height:100px;
background-color:yellow;
float:left;
}
</style>
<script type="text/javascript"></script>
</head>
<body>
<div class = "_box">
<span class = "_div1"></span>
<div class = "_div2"></div>
<div class = "_div3"></div>
</div>
</body>
</html>