css实现shadow窗口
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/*关键点： 1 半透明的兼容写法：opacity:0.5,filter:alpha(opacity:50); 2 z-index:要想z-index起作用必须给dom元素添加position:absolute; 3 窗口遮挡效果的实现：shadow的div添加：display="display" 不是disabled */
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<html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>shadow窗口</title><style>.shadow{opacity:0.5 !important;/*关键*/padding:0px;margin:0px;position:absolute;/*关键*/top:0px;left:0px;z-index:100;/*关键*/width:100%;height:100%;background:gray;/*关键*/filter:alpha(opacity:50);/*关键*/}</style></head><body style="border:1px solid red;padding:0px;margin:0px;"><div readonly="readonly"></div><input type="button" value="alert('aaaaaaaaaaa')" onclick="alert('aaaaaaaaaaa')"><div style="z-index:20000;position:absolute;top:20%;left:30%;"><input type="button" value="alert('bbbbbbbbbbbbbb')" onclick="alert('bbbbbbbbbbbbbb')"></div></body></html>