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2018-10-26 05:26:00来源:博客园 阅读 ()

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<style type="text/css">
    *{
        padding: 0;
        margin: 0;
    }
    ul,li{
        list-style: none;
    }
    #warp{
        width: 600px;
        height: auto;
        margin: 0 auto;
        margin-top: 20px;
    }
    #warp .content p{
        width: 300px;
        height: 30px;
        background-color: #000;
        color: #fff;
        line-height: 30px;
        text-align: center;
    }
    #warp .content+ .content{
        margin-top: 2px;
    }
    #warp .content ul{
        display: none;
    }
    #warp .content ul.on{
        display: block;
    }
    #warp .content li{
        background-color: #ccc;
        width: 300px;
        text-align: center;
    }
    #warp .content li + li{
        margin-top: 1px;
    }

</style>
<body>
    <div id="warp">
        <div class="content">
            <p>动物</p>
            <ul>
                <li>猴子</li>
                <li>大象</li>
                <li>狮子</li>
            </ul>
        </div>
        <div class="content">
            <p>山川</p>
            <ul>
                <li>长江</li>
                <li>黄河</li>
                <li>井水</li>
            </ul>
        </div>
        <div class="content">
            <p>美女</p>
            <ul>
                <li>貂蝉</li>
                <li>西施</li>
                <li>秀秀</li>
            </ul>
        </div>      
    </div>
    <script>
        let oP = document.getElementsByTagName("p"),
aUl = document.getElementsByTagName("ul"),
index;
            console.log(oP.length);
            for(var i=0;i<oP.length;i++){
                oP[i].index = i;
                oP[i].onclick = function(){
                index = this.index;
                aUl[index].className = aUl[index].className === ""? "on" : "";
                console.log(i)
            }
        }

            
        
    </script>
</body>
</html>

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