html+js+css实现遮挡层

<style>
#bg{display:none;position:fixed;width:100%;height:100%;background:#000;z-index:2;top:0;left:0;opacity:0.7;}
</style>

<script>
function showMask() {              
    document.getElementById("bg").style.display ="block";  
}  
function hideMask() {  
    document.getElementById("bg").style.display ='none';  
} 
</script>

<body>
<div id="bg"></div> 
</body>

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转载自newjava-sina-cn.iteye.com/blog/2409893