求救各位，为何我的nav_middle_right元素始终在nav_middle_left元素下面，谢谢！
<!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">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<link href="css/main.css" rel="stylesheet" type="text/css"/>
<script src="js/setHomeSetFav.js" type="text/javascript" charset="gb2312"></script>
</head>
<body>
<div class="top">
<div class="top_content">
<ul>
<li><a href="#">联系我们</a></li>
<li><a href="#" onclick="AddFavorite(window.location,document.title)"> 加入收藏</a></li>
<li><a href="#" onclick="SetHome(window.location)">设为首页</a></li>
</ul>
</div>
</div><!--top结束-->
<div class="wrap">
<div class="logo">
<div class="logo_left">
<img src="image/logo.jpg" alt="慕课网"/>
</div>
<div class="logo_right">
<img src="image/tel.jpg" alt="服务热线"/>24小时服务热线<span class="tel"> ：123-456-7890</span>
</div>
</div><!--/*logo结束*/-->
<div class="nav">
<div class="nav_left">
</div>
<div class="nav_middle">
<div class="XP">
<ul>
<li><a href="list.html">关于慕课</a></li>
<li><a href="list.html">新闻动态</a></li>
<li><a href="list.html">课程中心</a></li>
<li><a href="list.html">在线课程</a></li>
<li><a href="list.html">人才招聘</a></li>
</ul>
</div>
<div class="nav_middle_right">
<form action="" method="post">
<input type="text" />
</form>
</div>
</div><!--navmiddle结束-->
<div class="nav_right">
</div>
</div><!--NAV结束-->
</div><!--/*wrap结束*/-->
</body>
</html>
////////////////////////////////////////////////////////////////CSS//////////////////////////////////////////
@charset "utf-8";
/* CSS Document */
*{margin:0;padding:0;font-size:12px}
/*头部*/
body{
background-color:#F5F5F5;
}
.top
{
width:100%;
height:27px;
background:url(../image/top_bg.jpg) repeat-x;}
.top_content
{
width:1000px;
margin:0 auto;}
.top_content li
{
list-style-image:url(../image/li_bg.gif);
float:right;
width:70px;
line-height:27px;
}
.top_content a:link,.top_content a:visited
{
color:#8E8E8E;
text-decoration:none
}
.top_content a:hover,.top_content a:active
{
color:#900;
text-decoration:none;
}
.wrap
{
width:1000px;
margin:0 auto;}
.logo
{
height:80px;
background-color:#FFF
}
.logo_left
{
width:200px;
float:left
}
.logo_right
{
width:300px;
float:right;
height:28px;
margin-top:30px;
color:#8E8E8E;
}
.logo_right img
{ vertical-align:middle;
margin-right:10px
}
.tel
{
font-family:Arial, Helvetica, sans-serif;
font-size:16px;
color:#C00;}
.nav
{
height:40px;
}
.nav_left
{
width:10px;
background:url(../image/nav_left.jpg) no-repeat;
}
.nav_middle
{
width:980px;
background: url(../image/nav_bg.jpg) repeat-x;
}
.nav_right
{
width:10px;
background:url(../image/nav_right.jpg) no-repeat;
}
.nav_left,.nav_middle,.nav_right
{
float:left;
height:40px}}
.XP
{
width: 680px;
float: left;
}
.nav_middle_right
{
width: 300px;
float: left;
}
慕无忌29613842回答
-
cnyballk
兄弟，你根本没有nav_middle_left 这个类 -
FSYu
楼上说的没毛病
随时随地看视频慕课网APP
CSS3
Html5