层显示在最底层的属性

层显示在最底层的属性 知道的速度

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  1.   


    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>无标题文档</title>
    <style type="text/css">
    <!--
    body,td,th {
    font-size: 12px;
    }
    .a { position:absolute; top:10px; left:10px; background-color:#CCCCCC; width:200px; height:200px; z-index:1; }
    .b { position:absolute; top:30px; left:30px; background-color:#009900; width:200px; height:200px; z-index:2; }
    .c { position:absolute; top:50px; left:50px; background-color:#FFCC00; width:200px; height:200px; z-index:3; }
    -->
    </style></head><body>
    <div class="a">1</div>
    <div class="b">2</div>
    <div class="c">3</div>
    </body>
    </html>
    浏览查看效果