页面的hea大部分，需设置要页面元素的样式，代码如下：

* { margin: 0; padding: 0; }
body { margin: 0; padding: 0; text-decoration: none; font-size: 14px; font-family: 'Microsoft YaHei','Lantinghei SC','Open Sans',Arial,'Hiragino Sans GB','STHeiti','WenQuanYi Micro Hei','SimSun',sans-serif; }
li { list-style: none; }
.menu { width: 1000px; height: 600px; margin: 30px auto; background-color: #ececec; }
.menu .menuTop { background-color: #F10215; color: #fff; width: 140px; height: 40px; padding-left: 20px; line-height: 40px; cursor: pointer; }
.menu ul { width: 160px; background-color: #fff; border: 2px solid #F10215; box-sizing: border-box; position: relative; }
.menu ul li { height: 30px; padding-left: 8px; text-align: left; line-height: 30px; font-size: 13px; background: url(image/1.png) no-repeat right; z-index: 2; }
.menu ul li a { color: #707077; }
.menu ul li a:hover { color: red; text-decoration: underline; cursor: pointer; }
.menu ul li:hover { border: 1px solid #DDD; border-right: 0; background-image: none; }
.menu ul li:hover .submenu { display: block; }
.menu ul li:hover span { width: 30px; height: 30px; display: inline-block; background-color: #FFF; float: right; z-index: 100; position: relative; }
.menu ul li .submenu { position: absolute; left: 146px; top: 0; width: 720px; height: 300px; border: 1px solid #DDD; box-shadow: 0 0 8px #DDD; -moz-box-shadow: 0 0 8px #DDD; -webkit-box-shadow: 0 0 8px #DDD; background-color: #FFF; z-index: 3; display: none; }
.menu ul li .submenu .subleft { margin-left: 0px; width: 400px; height: 300px; float: left; padding: 5px; }
.menu ul li .submenu .subleft dl { overflow: hidden; border-bottom: 1px solid #D1D1D1; padding: 10px 0; }
.menu ul li .submenu .subleft dl dt { float: left; height: 22px; line-height: 22px; margin-right: 10px; font-weight: bold; color: #707070; font-size: 12px; cursor: pointer; }
.menu ul li .submenu .subleft dl dd { }
.menu ul li .submenu .subleft dl dd a { display: block; float: left; border-left: 1px solid #707070; padding: 0 5px; color: #707070; height: 14px; line-height: 14px; margin: 3px 0; font-size: 11px; }
.menu ul li .submenu .subright { width: 310px; height: 300px; background-color: blue; float: left; }

页面的body部分，多个li标签放入不同的导航菜单内容，以下省略了部分演示代码：

<div class="menu">
  <div class="menuTop">全部商品分类</div>
  <ul>
    <li> <a herf="javascript:;">一级标题 1</a> <span></span>
      <div class="submenu">
        <div class="subleft">
          <dl>
            <dt>二级标题111</dt>
            <dd> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> </dd>
          </dl>
          <dl>
            <dt>二级标题</dt>
            <dd> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> </dd>
          </dl>
          <dl>
            <dt>二级标题</dt>
            <dd> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> </dd>
          </dl>
          <dl>
            <dt>二级标题</dt>
            <dd> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> </dd>
          </dl>
        </div>
        <div class="subright" style="background-color: antiquewhite"> </div>
      </div>
    </li>

<!-- 省略部分演示代码 -->

    <li> <a herf="javascript:;">一级标题 10</a> <span></span>
      <div class="submenu">
      <div class="subleft">
        <dl>
          <dt>二级标题1010</dt>
          <dd> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> </dd>
        </dl>
        <dl>
          <dt>二级标题</dt>
          <dd> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> </dd>
        </dl>
        <dl>
          <dt>二级标题</dt>
          <dd> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> </dd>
        </dl>
        <dl>
          <dt>二级标题</dt>
          <dd> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题</a> <a href="javascript:;">三级标题10</a> </dd>
        </dl>
      </div>
      <div class="subright" style="background-color:salmon"> </div>
    </li>
  </ul>
</div>