<div class="nav">
<div class="nav_leif"></div>
<div class="nav_mid">
<div class="nav_mid_left">
<ul>
<li><a href="#">首页</a></li>
<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">关于课程</a></li>
<li><a href="list.html">人才招聘</a></li>
</ul>
</div>
<div class="nav_mid_right">
<form action="" method="post">
<input type="text" />
</form>
</div>
</div> <!--nav_mid结束-->
<div class="nav_right"></div>
</div>
<div class="nav_leif"></div>这个class错了
我的nav是放进wrap里的,但是就是不对齐,wrap宽度设置了1000