abstrakt：<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0">&
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>浮動</title>
<style>
*{margin: 0;padding: 0;}
.head{
width: 100%;background-color: #ccc;
height: 40px;
}
.main{
width: 70%;height: 40px;background-color: cornflowerblue;
margin: 0 auto;
}
ul li{
list-style: none;
height: 40px;width: 100px;margin: 0 5px;
float: left;background-color: bisque;
text-align: center;line-height: 40px;
}
.php a{
height: 40px;width: 200px;margin: 3px;float: left;
background-color: blueviolet;display: none;
}
.php:hover a{
display: block;
}
</style>
</head>
<body>
<div class="head">
<div class="main">
<ul>
<li>html</li>
<li class="php">php
<a>php中文網(wǎng)學習</a>
<a>php中文網(wǎng)學習</a>
<a>php中文網(wǎng)學習</a>
</li>
<li>js</li>
<li>jq</li>
<li>css</li>
</ul>
</div>
</div>
</body>
</html>
Korrigierender Lehrer：滅絕師太Korrekturzeit：2019-02-13 15:43:45
Zusammenfassung des Lehrers：完成的不錯,前端浮動是魔鬼,要注意浮動的使用場景以及清除浮動的作用