JavaScript DOM操作案例显示和隐藏二维码 

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style>
        .nodeSmall {
            width: 50px;
            height: 50px;
            background: url(../images/bgs.png) no-repeat -159px -51px;
            position: fixed;
            right: 10px;
            top: 40%;
        }
        .erweima {
            position: absolute;
            top: 0;
            left: -150px;
        }
        .nodeSmall a {
            display: block;
            width: 50px;
            height: 50px;
        }
        .hide {
            display: none;
        }

        .show {
            display: block;
        }
    </style>


</head>
<body>
<div class="nodeSmall" id="node_small">
    <a href="#"></a><!--锚定-->
    <div class="erweima hide" id="er">
        <img src="../images/456.png" alt=""/>
    </div>
</div>
<script src="common.js"></script>
<script>
    //获取鼠标要进入的a标签

    //先获取最外面的div
    var aObj = my$("node_small").getElementsByTagName("a")[0];
    //为a注册鼠标进入事件
    aObj.onmouseover = function () {
      my$("er").className = "erweima show";
    };
    //为a注册鼠标离开事件
    aObj.onmouseout = function () {
      my$("er").className = "erweima hide";
    };
</script>
</body>
</html>

 

posted @ 2018-07-22 22:50  {颜逸}  阅读(279)  评论(0)  编辑  收藏  举报