js相关小实例——二级菜单

样式代码

<style type="text/css">
*{ margin:0px auto; padding:0px}
#menu{width:150px; height:300px; position:fixed; left:100px; top:200px}
.yiji{ width:150px; height:35px; background-color:#63C; border:1px solid white; text-align:center; line-height:35px; vertical-align:middle; color:white; font-weight:bold}
#erji1{ width:150px; display:none}
.xiang21{width:150px; height:35px; background-color:#F96; border:1px solid white; text-align:center; line-height:35px; vertical-align:middle; color:white; font-weight:bold}
#erji2{ width:150px; display:none}
.xiang22{width:150px; height:35px; background-color:#F96; border:1px solid white; text-align:center; line-height:35px; vertical-align:middle; color:white; font-weight:bold}
#erji3{ width:150px; display:none}
.xiang23{width:150px; height:35px; background-color:#F96; border:1px solid white; text-align:center; line-height:35px; vertical-align:middle; color:white; font-weight:bold}
</style>

代码

<div id="menu">
    <div class="yiji" onclick="showa('erji1')">
        首页
    </div>
    <div id="erji1">
        <div class="xiang21">首页1</div>
        <div class="xiang21">首页2</div>
        <div class="xiang21">首页3</div>
    </div>
    
    
    <div class="yiji" onclick="showa('erji2')">
        产品中心
    </div>
    <div id="erji2">
        <div class="xiang22">产品1</div>
        <div class="xiang22">产品2</div>
        <div class="xiang22">产品3</div>
    </div>
    
    <div class="yiji" onclick="showa('erji3')">
        活动中心
    </div>
    <div id="erji3">
        <div class="xiang23">活动1</div>
        <div class="xiang23">活动2</div>
        <div class="xiang23">活动3</div>
    </div>
</div>

js代码

<script type="text/javascript">
function showa(d)
{
    //找对应的二级菜单
    var ej = document.getElementById(d);
    if(ej.style.display=="block")
    {
        ej.style.display="none";
    }
    else
    {
        ej.style.display = "block";
    }
}
</script>

运行结果