局部遮罩 shade（二）

其实它和全局遮罩是一样的思想，只不过就要用position了

<script type="text/javascript">
    function shade(){
     var p = document.getElementById("shade");
     p.className = "d";
     p.style.display = "block";

    
    }
    function shadeDisplay(){
     var p = document.getElementById("shade");
     p.style.display = "none";
    
    }
</script>
<style type="text/css">
    #s{
        width:600px;
        height:500px;
        margin:0px auto;
        z-index:999;
        position:relative;/*使子元素的坐标以父元素的左上角坐标为远点(0,0)*/
        border:1px solid #000;

    }
    .d{
        width:600px;
        height:500px;
        position:absolute;
        left:0px;
        top:0px;
        background-color:green;
        -moz-opacity:0.5;/*Firefox*/
        opacity:0.5;/*Opera*/
        filter:alpha(opacity=50); /*IE*/
    
    }
</style>
</head>

<body>
    <div id="s">
        <a href="javascript:shade()">shade局部遮罩</a>
        <div id="shade"></div>
    </div>
    <a href="javascript:shadeDisplay()">shade遮罩消失</a>
</body>

 

posted @ 2012-08-04 15:21  妍珊  阅读(569)  评论(0)  编辑  收藏  举报