二级菜单不能顶头_html/css_WEB-ITnose-HTML Tutorial-php.cn

二级菜单不能顶头_html/css_WEB-ITnose

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Release： 2016-06-24 11:32:45

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<!DOCTYPE html ><html><head>    <title></title>    <style >    #menu,#submenu{ font-family:微软雅黑; font-size:medium;}/*菜单字体*/       #menu{width:100%}    #menu ul,#submenu ul{ list-style:none;} /*去掉列表的点*/     #menu ul li,#submenu ul li{ float:left; padding:10px; width:120px; text-align:center}/*横向显示*/     #submenu{ text-align:left; display: block; position: inherit;}    #menu ul li:hover{ border-bottom-style:solid; border-bottom-color:rgba(0,0,255,.5); cursor:pointer; color:rgba(255,0,0,.5);}    #menu ul li:active{border-bottom-style:none; border-bottom-color:Red;cursor:pointer;color:Red;}    .subfirst{ float:left; display:none;}    </style>    <script src="jquery.2.1.4.min.js" type="text/javascript"></script>    <script type="text/javascript">        function showsub(rootid) {            hidesub();            $('#submenu' + rootid).show();        }        function hidesub() {            for (var i = 1; i <= 3; i++) {                $('#submenu' + i).hide();            }        }    </script></head><body>    <div id="menu">    <ul>    <li id="menu1" onmouseover="showsub(1)";">根菜单一</li>    <li id="menu2" onmouseover="showsub(2)";">根菜单二</li>    <li id="menu3" onmouseover="showsub(3)";">根菜单三</li>    </ul>    </div>    <div id="submenu">    <ul id="submenu1" class="subfirst">    <li id="menu11">二级菜单1-1</li>    <li id="menu12">二级菜单1-2</li>    <li id="menu13">二级菜单1-3</li>    </ul>    <ul id="submenu2" class="subfirst">    <li id="menu21">二级菜单2-1</li>    <li id="menu22">二级菜单2-2</li>    <li id="menu23">二级菜单2-3</li>    </ul>    <ul id="submenu3" class="subfirst">    <li id="menu31">二级菜单3-1</li>    <li id="menu32">二级菜单3-2</li>    <li id="menu33">二级菜单3-3</li>    </ul>    </div></body></html>

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二级菜单不能顶头是什么没有设置好，设置了div百分百的宽度，还是接着后面显示了

想让二级菜单换行显示，CSS怎么控制