jquery tab栏切换

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style type="text/css">
        * {
            margin: 0;
            padding: 0;
        }
        ul {
            list-style: none;
        }
        .wrapper {
            width: 1000px;
            height: 475px;
            margin: 0 auto;
            margin-top: 100px;
        }

        .tab {
            border: 1px solid #ddd;
            border-bottom: 0;
            height: 36px;
            width: 320px;
        }

        .tab li {
            position: relative;
            float: left;
            width: 80px;
            height: 34px;
            line-height: 34px;
            text-align: center;
            cursor: pointer;
            border-top: 4px solid #fff;
        }

        .tab span {
            position: absolute;
            right: 0;
            top: 10px;
            background: #ddd;
            width: 1px;
            height: 14px;
            overflow: hidden;
        }

        .products {
            width: 1002px;
            border: 1px solid #ddd;
            height: 476px;
        }

        .products .main {
            float: left;
            display: none;
        }

        .products .main.selected {
            display: block;
        }

        .tab li.active {
            border-color: red;
            border-bottom: 0;
        }

    </style>

</head>
<body>
<div class="wrapper">
    <ul class="tab">
        <li class="tab-item active">1<span>◆</span></li>
        <li class="tab-item">2<span>◆</span></li>
        <li class="tab-item">3<span>◆</span></li>
        <li class="tab-item">4</li>
    </ul>
    <div class="products">
        <div class="main selected">
            <a href="###"><img src="imgs/1.jpg" alt=""/></a>
        </div>
        <div class="main">
            <a href="###"><img src="imgs/2.jpg" alt=""/></a>
        </div>
        <div class="main">
            <a href="###"><img src="imgs/3.jpg" alt=""/></a>
        </div>
        <div class="main">
            <a href="###"><img src="imgs/4.jpg" alt=""/></a>
        </div>
    </div>
</div>

<script>
    var lis = document.querySelectorAll(".tab-item");
    var divs = document.querySelectorAll(".main");

    // 注册鼠标经过事件
    for(var i = 0; i < lis.length; i++) {
        lis[i].index = i;
        lis[i].onmouseover = function () {
            // 让当前li有active类，其他li没有active类型
            for(var i = 0; i < lis.length; i++) {
                lis[i].classList.remove("active");
                divs[i].classList.remove("selected");
            }

        // 让对应下标的div有selected类，其他div没有selected类
            this.classList.add("active");
            divs[this.index].classList.add("selected");
        };
    }
</script>

</body>
</html>
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