JavaScript DOM操作案例tab切换案例 

<!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: purple;
        }

        .bd li {
            height: 255px;
            background-color: purple;
            display: none;
        }

        .bd li.current {
            display: block;
        }
    </style>

</head>
<body>
<div class="box" id="box">
    <div class="hd">
        <span class="current">体育</span>
        <span>娱乐</span>
        <span>新闻</span>
        <span>综合</span>
    </div>
    <div class="bd">
        <ul>
            <li class="current">我是体育模块</li>
            <li>我是娱乐模块</li>
            <li>我是新闻模块</li>
            <li>我是综合模块</li>
        </ul>
    </div>
</div>
<script src="common.js"></script>
<script>
    //获取最外面的div标签
    var box = my$("box");
    //获取里面的第一个div
    var hd = box.getElementsByTagName("div")[0];
    //获取里面的第二个div
    var db = box.getElementsByTagName("div")[1];
    //获取所有的span标签
    var spans = hd.getElementsByTagName("span");
    //获取所有的li标签
    var lis = db.getElementsByTagName("li");
    //循环遍历的方式添加点击事件
    for (var i = 0; i < spans.length; i++) {
        //在点击之前把索引存储到span标签中
        spans[i].setAttribute("index", i);
        spans[i].onclick = function () {
            //点击的时候获取存储的索引值
            var index = this.getAttribute("index");
            //第一件事,所有的span的类样式全部移除
            for (var j = 0; j < spans.length; j++) {
                spans[j].removeAttribute("class");
                lis[j].removeAttribute("class");
            }
            //第二件事,当前被点击的span添加类样式
            this.className = "current";
            lis[index].className = "current";
        };
    }
</script>
</body>
</html>

 

posted @ 2018-07-25 23:07  {颜逸}  阅读(587)  评论(0)    收藏  举报