tab鼠标移上切换页面

排他思想
对应控制思想


<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style>
        * {margin:0; padding: 0;}
        ul {
            list-style-type: none;
        }
        .box {
            width: 400px;
            height: 300px;
            border: 1px solid #ccc;
            margin: 100px auto;
            overflow: hidden;
        }
        .hd {
            height: 45px;
        }
        .hd span {
            display:inline-block;
            width: 90px;
            background-color: pink;
            line-height: 45px;
            text-align: center;
            cursor: pointer;
        }
        .hd span.current {
            background-color: skyblue;
        }
        .bd div {
            height: 255px;
            background-color: skyblue;
            display: none;
        }
        .bd div.current {
            display: block;
        }
    </style>

</head>
<body>
    <div class="box">
        <div class="hd" id="hd">
            <span class="current">体育</span>
            <span>娱乐</span>
            <span>新闻</span>
            <span>综合</span>
        </div>
        <div class="bd" id="bd">
            <div class="current">我是体育模块</div>
            <div>我是娱乐模块</div>
            <div>我是新闻模块</div>
            <div>我是综合模块</div>
        </div>
    </div>
    <script src="common.js"></script>
    <script>
        var hd = my$("hd");
        var spans = hd.getElementsByTagName("span");
        var hd = my$("bd");
        var divs = hd.getElementsByTagName("div");
        console.log(divs);

        for(var i=0;i<spans.length;i++){

            //为每个spans设置一个index, 为了后续bd部分可以获取下标 (对应控制思想)
            //因为this里没有下标相关的数据
            spans[i].index = i;

            spans[i].onmouseover = function (){

                console.log(this.index);

                //排他思想
                //排除其他
                for(var j=0;j<spans.length;j++){
                    spans[j].className = "";
                    divs[j].className = "";
                }

                //保留自己
                this.className = "current";
                divs[this.index].className = "current";
            };
        }

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

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