div 遮罩层
<html><head> <title></title> <script type="text/javascript"> function show() { document.getElementById("forbidden").style.display = ""; document.getElementById("content").style.display = ""; //透明度 document.getElementById("forbidden").style.filter = "Alpha(Opacity=50)"; document.getElementById("content").innerHTML = "你的内容<input onclick='hide()' type='button' value='确定'/>"; } function hide() { document.getElementById("forbidden").style.display = "none"; document.getElementById("content").style.display = "none"; } </script></head><body><div style="width: 100%; background-color:Gray; display:none; height: 100%; position:absolute; left: 0; top: 0;" id="forbidden"></div><div style="width: 260px; background-color:Blue; display:none; height: 113px; position:absolute; left: 244px; top: 137px;" id="content"></div><div id="fuck"><inputtype="button" value="显示"/></div></body></html>摘要：在页面中放两个div 第一个宽高都设置成100% 第二个设置成自己想要的大小
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