简单Tab切换

　　延迟Tab切换，使用css中的flex布局，原生js实现。（京东首页菜单也有此延迟功能哦！）

　　每天进步一丢丢~~

　　

1、延迟Tab切换

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>延迟菜单</title>
    <style>
        * {
            padding: 0;
            margin: 0;
            font-size: 14px;
        }
        li {
            list-style: none;
        }
        a {
            text-decoration: none;
        }
        .container {
            width: 1000px;
            height: 600px;
            margin: 0 auto;
            border: thin solid #000;
            overflow: hidden;
        }
        .container .nav {
            width: 100%;
            height: 40px;
            line-height: 40px;
        }
        .container .nav ul {
            display: flex;
            flex-flow: row nowrap;
            justify-content: space-around;
            background: #2b2b2b;
        }
        .container .nav ul li {
            width: 200px;
            border-right: thin solid #ddd;
            text-align: center;
        }
        .container .nav ul li:last-child {
            border-right: none;
        }
        .container .nav li a {
            color: #fff;
            display: inline-block;
            width: 200px;
            height: 40px;
        }
        .active {
            background: rgb(99, 3, 3);;
        }
    </style>
</head>
<body>

    <div class="container">
        <div class="nav">
            <ul id="list">
                <li class="active"><a href="#">首页</a></li>
                <li><a href="#">年度旅游</a></li>
                <li><a href="#">通知公告</a></li>
                <li><a href="#">企业文化</a></li>
                <li><a href="#">联系我们</a></li>
            </ul>
        </div>
        <div class="content" id="content">
            <div class="mode">首页</div>
            <div class="mode" style="display: none;">年度旅游</div>
            <div class="mode" style="display: none;">通知公告</div>
            <div class="mode" style="display: none;">企业文化</div>
            <div class="mode" style="display: none;">联系我们</div>
        </div>
    </div>

    <script>
        window.onload = function(){
            var lis = $id('list').getElementsByTagName('li');
            var modes = $id('content').getElementsByClassName('mode');
            var timer = null;

            if(lis.length !== modes.length){
                return;
            }

            for(var i=0; i<lis.length; i++){
                lis[i].id = i;
                lis[i].onmouseover = function(){
                    var that = this;
                    if(timer){
                        clearTimeout(timer);
                        timer = null;
                    }
                    timer = setTimeout(function(){
                        for(var j=0; j<lis.length; j++){
                        lis[j].className = '';
                        modes[j].style.display = 'none';
                    }
                    lis[that.id].className = 'active';
                    modes[that.id].style.display = 'block';
                    }, 500);
                };
            }
        };
        function $id(id){
            return typeof id === 'string' ? document.getElementById(id) : id;
        }
    </script>

</body>
</html>

2、自动Tab切换

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>自动切换tab</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }
        li {
            list-style: none;
        }
        a {
            text-decoration: none;
            color: #fff;
        }
        .container  {
            width: 1000px;
            height: 360px;
            margin: 0 auto;
            border: thin solid #d5d5d5;
        }
        .container .nav {
            width: 100%;
            height: 40px;
            line-height: 40px;
            background: #2b2b2b;
        }
        .container .nav ul {
            display: flex;
            flex-flow: row nowrap;
            justify-content: space-around;
        }
        .container .nav ul li {
            border-right: thin solid #eee;
            width: 199px;
            text-align: center;
        }
        .container .nav ul li:last-child {
            border-right: none;
        }
        .container .nav ul li a {
            display: inline-block;
            width: 100%;
        }
        .content {
            height: 320px;
            line-height: 320px;
            text-align: center;
            font-size: 22px;
            font-weight: 700;
        }
        .active {
            background: rgba(121, 16, 24, 0.93);
        }
    </style>
</head>
<body>

<div class="container">
    <div class="nav">
        <ul id="list">
            <li class="active"><a href="#">整装设计</a></li>
            <li><a href="#">家具馆</a></li>
            <li><a href="#">建材馆</a></li>
            <li><a href="#">灯饰馆</a></li>
            <li><a href="#">定制馆</a></li>
        </ul>
    </div>
    <div class="content" id="content">
        <div class="mode">整装设计</div>
        <div class="mode" style="display: none;">家具馆</div>
        <div class="mode" style="display: none;">建材馆</div>
        <div class="mode" style="display: none;">灯饰馆</div>
        <div class="mode" style="display: none;">定制馆</div>
    </div>
</div>

<script>
    window.onload = function(){
        var lis = $id('list').getElementsByTagName('li');
        var modes = $id('content').getElementsByClassName('mode');
        var timer = null;
        var index = 0;

        if(lis.length !== modes.length){
            return;
        }

        changeIndex();

        for(var j=0; j<lis.length; j++){
            lis[j].id = j;
            //鼠标移入时，清除定时器，当前盒子高亮
            lis[j].onmouseover = function(){
                clearInterval(timer);
                box(this.id);
            };
            //鼠标移出时，启动定时器，继续自动切换盒子
            lis[j].onmouseout = function(){
                changeIndex();
            };
        }

        function changeIndex(){
            timer = setInterval(function(){
                index ++;
                if(index >= lis.length){
                    index = 0;
                }
                box(index);
            },2000);
        }

        function box(currentIndex){
            for(var k=0; k<lis.length; k++){
                lis[k].className = '';
                modes[k].style.display = 'none';
            }
            lis[currentIndex].className = 'active';
            modes[currentIndex].style.display = 'block';
            //重置索引为鼠标移入时的盒子
            index = currentIndex;
        }

    };
    function $id(id){
        return typeof id === 'string' ? document.getElementById(id) : id;
    }
</script>

</body>
</html>