原生js实现tab栏切换功能

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原理:还是排他功能。这个tab栏我用了两个排他功能来实现的。

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
    *{
        margin: 0;
        padding: 0;
    }
    div{
        margin: 100px 100px;
    }
    li{
        list-style-type: none;
    }
    #top{
        width: 500px;
        height: 40px;
        line-height: 40px;
        text-align: center;
        background: #f2f2f2;
    }
    #top li{
        width: 100px;
        float: left;
    }
    #top li.current{
        background: lightcoral;
    }
    #bottom{
        width: 500px;
        height: 140px;
        background: lightcoral;
        position: relative;
    }
    #bottom li{
        position: absolute;
        left: 0;
        top: 0;
        right: 0;
        bottom: 0;
        padding-left: 15px;
        box-sizing: border-box;
        display: none;
    }
    #bottom li.current{
        display: block;
    }
    </style>
</head>
<body>
    <div>
        <ul id="top">
            <li class="current">周一</li>
            <li>周二</li>
            <li>周三</li>
            <li>周四</li>
            <li>周五</li>
        </ul>
        <ul id="bottom">
            <li class="current">我是周一</li>
            <li>我是周二</li>
            <li>我是周三</li>
            <li>我是周四</li>
            <li>我是周五</li>
        </ul>
    </div>
    
<script>

    var navList=document.getElementById('top').getElementsByTagName('li');
    var contents=document.getElementById('bottom').getElementsByTagName('li');
    for(var i=0;i<navList.length;i++){
        //在事件之前我先把索引给准备好
        navList[i].setAttribute("index",i);
        navList[i].onclick=function(){
            for(var j=0;j<navList.length;j++){
            //removeAttribute既可以移除自定义属性,也可以移除非自定义属性
                navList[j].removeAttribute('class');
            }
            this.className="current";
            //将索引值先给存下来
            var num=this.getAttribute("index");
            for(var k=0;k<contents.length;k++){
                contents[k].removeAttribute('class');
            }
            contents[num].className="current";
        }
    }
    
</script>
</body>
</html>

排他功能原理不清楚的小伙伴请戳:原生js实现按钮的排他功能???