zIndex属性在IE中无效

在ie中他的子类的zindex就以父类为准；

 <!doctype html>
 <html>
 <head>
 <meta charset="utf-8">
 <title>无标题文档</title>
 <style>
 #div1{ width:200px; height:200px;  float:left; border:1px solid red;}
 #div2{ width:200px; height:200px;  float:left; border:1px solid black;}

 .blue{ width:300px; height:300px; background-color:blue;}
 .green{ width:300px; height:300px; background-color:green;}
 </style>
 </head>

 <body>
 <div id="div1" style="position:relative;z-index:1;">
     <div class="blue" style="position:absolute;z-index:9999"><span style="color:red;">zIndex:9999</span></div>
 </div>

 <div id="div2" style="position:relative;z-index:2;">
     <div class="green" style="position:absolute;z-index:10"><span style="color:#fff">zIndex:10</span></div>
 </div>
 </body>
 </html>

div1子类的zindex为9999，父类的zindex为1， div2的子类的zindex为10，父类的zindex为2，比较父类的zindex大小，所以div1，无法覆盖div2

巴特西

zIndex属性在IE中无效

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