js 实现tab栏切换效果

效果图：
源码：
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        #tab{
            width:1000px; height: 475px; margin: 100px auto;;
        }
        ul{
            list-style: none;
            width: 320px;
            height: 36px;
            border: 1px solid #ddd;
            padding-left: 15px;
        }
        #tab li{
            float: left;
            width: 80px;
            height: 34px;
            line-height: 34px;
            cursor: pointer;
            border-top: 4px solid #fff;
            text-align: center;
            position: relative;
        }
        #tab li.active{
            border-top-color: red;
        }
        span{
            position: absolute;
            right: -2px;
        }
        #option{
            border: 1px solid #ddd;
            margin-top: -1px;
        }
    </style>
</head>
<body>
<div id="tab">
    <ul>
        <li class="active">国际大牌<span>|</span></li>
        <li>国装名牌<span>|</span></li>
        <li>清洁用品<span>|</span></li>
        <li>男士精品</li>
    </ul>
    <div id="option">
        <img src="t1.jpg" alt="" id="picture"/>
    </div>
</div>
<script type="text/javascript">
    var lis = document.getElementById("tab").getElementsByTagName("li");
    var pic = document.getElementById("picture");
    for(var i=0;i<lis.length;i++){
        lis[i].index = i;//获取索引位置
        lis[i].onmouseover = function () {

            for(var j =0;j<lis.length;j++ ){
                lis[j].className = "";
            }
            this.className="active";
            pic.setAttribute("src","t"+(this.index+1)+".jpg");
        }
    }

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