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js css 实现遮罩层

2024-07-08 13:48:05   224人阅读

<div  style=" position: fixed; width: 100%; height: 100%;
	            left: 0px; top: 0px; background-color: Black; z-index: 9999; filter: alpha(opacity=70); Opacity:0.7;"></div>


z-index 必须大于遮罩元素




demo


<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>

<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1" />
<meta name="apple-mobile-web-app-capable" content="yes" />
<script type="text/javascript" src="jquery-1.7.2.min.js"></script>
<style type="text/css">
	ul, ul ul {
  list-style-type:none;
  margin: 0;
  padding: 0;
  width: 15em;
}

ul a {
  display: block;
  text-decoration: none;	
}

ul li {
  margin-top: 1px;
}

ul li a {
  background: #333;
  color: #fff;	
  padding: 0.5em;
}

ul li a:hover {
  background: #000;
}

ul li ul li a {
  background: #ccc;
  color: #000;
  padding-left: 20px;
}

ul li ul li a:hover,ul li ul .current a {
  background: #aaa;
  border-left: 5px #000 solid;
  padding-left: 15px;
}

</style>
</head>

<body>
<div id="bb" style="background-color: red;display:none;z-index: 99999; max-height:79.3%; position: fixed; filter: alpha(opacity=70); Opacity:0.7; top: 10px; left:5px;"> 
<ul>
	<li>
	<a href="">老大</a>
	<ul>
	<li>
	<a href="javascript:alert('you can do you want');">老大大</a>
	<li>
	<li>
	<a href="javascript:alert('you can do you want');">老大二</a>
	<li>
	<li>
	<a href="javascript:alert('you can do you want');">老大三</a>
	<li>
	<li>
	<a href="javascript:alert('you can do you want');">老大四</a>
	<li>
</ul>
	<li>
	<li>
	<a href="javascript:alert('you can do you want');">老二</a>
	<li>
	<li>
	<a href="javascript:alert('you can do you want');">老三</a>
	<li>
	<li>
	<a href="">老四</a>
	<ul >
	<li><a href="javascript:alert('you can do you want');">老一</a><li>
	</ul>
	<li>
</ul>
</div>
<br>
<br>
<br>
<br>
<br>
<br>

<br>
<br><br><br>
<br>
<br>
<button id="aa">哈哈</button>
<div id="zz"  style="display:none;position: fixed; width: 100%; height: 100%;
	            left: 0px; top: 0px; background-color: Black; z-index: 1999; filter: alpha(opacity=70); Opacity:0.7;"></div>
</body>
<script type="text/javascript">
$(function(){
   $("#aa").click(function(){
     $("#zz").show();
	  $("#bb").show();
	  $("#bb").animate({left:'100px'});
			$("#bb").animate({left:'0px'});
   });
   $("#zz").click(function(){
	   $("#bb").animate({left:'-240px'});
     $("#zz").hide();
   });
   $('#bb ul li ul').hide();
   $("#bb ul li a").click(function(){
    var a= $(this);
	var nextobj=a.next();
	if(nextobj.is("ul")){
	 $('#bb ul li ul:visible').slideUp('normal');
	 if(!nextobj.is(':visible')){
        	nextobj.slideDown('normal');
        }
        return false;
	}
   });
});
</script>
</html>





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