9月25作业解析---点击显示下拉子菜单
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.list{ width:198px; height:30px; text-align:center; line-height:30px; vertical-align:middle; border-left:1px solid #999;border-right:1px solid #999;}
#z4{ border-bottom:1px solid #999;}
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</head>
<body>
<div style="width:200px; height:600px; margin-top:30px">
<div class="zhu" onclick="Show('z1')">
首页
</div>
<div class="zi" id="z1">
<div class="list">你好</div>
<div class="list">首页</div>
</div>
<div class="zhu" onclick="Show('z2')">
教务信息
</div>
<div class="zi" id="z2">
<div class="list">你好</div>
<div class="list">首页</div>
</div>
<div class="zhu" onclick="Show('z3')">
下载专区
</div>
<div class="zi" id="z3">
<div class="list">你好</div>
<div class="list">首页</div>
</div>
<div class="zhu" onclick="Show('z4')">
学员信息管理
</div>
<div class="zi" id="z4">
<div class="list">你好</div>
<div class="list">首页</div>
</div>
</div>
</body>
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function Show(id)
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