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<html>
<head>
<script src="http://lib.sinaapp.com/js/jquery/1.7.2/jquery.min.js"></script>
<script>
var oldPosition;
var oldPosition;
$(function(){
$('#trigger').bind('click',function(){
$mask=$('#mask-layout');
if($mask.length){
//想显示现实哪个填哪个id
$target=$("#mid");
$target.css("position",oldPosition)
$target.css("z-index",oldPosition)
$mask.remove()
}else{
//想显示现实哪个填哪个id
$target=$("#mid");
oldPosition= $target.css("position")
oldZindex=$target.css("z-index")
$target.css("position","relative")
$target.css("z-index",10000)
$("body").prepend('<div id="mask-layout" style="background-color:#000000;height:'+$(document).height()+'px;width:'+$(document).width()+'px;left:0;right:0;position:absolute;z-index:1000"></div>')
$('#mask-layout').css("opacity",0.5);
}
})
$('#mask-all').bind('click',function(){
$mask=$('#mask-all-layout');
if($mask.length){
$mask.remove()
}else{
$("body").prepend('<div id="mask-all-layout" style="background-color:#000000;height:'+$(document).height()+'px;width:'+$(document).width()+'px;left:0;right:0;position:absolute;z-index:8000"></div>')
$('#mask-all-layout').css("opacity",0.5);
}
})
})
</script>
<style>
.float{float:left;height: 200px;}
#left{background-color: red;width: 200px }
#mid{background-color: yellow;width: 250px}
#right{background-color: blue;width: 300px;}
#trigger{position:relative;z-index: 10000}
#mask-all{position:relative;z-index: 10000}
</style>
</head>
<body>
<div >
<div id="left" class="float">左侧</div>
<div id="mid" class="float">中</div>
<div id="right" class="float">右</div>
<div style="clear: both"></div>
<button id="trigger">狠戳这里显示一个</button><button id="mask-all">猛击全遮罩</button>
<br>(点击显示或取消遮罩)
</div>
</body>
</html>