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DIV CSS遮罩层

<!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><title>DIV CSS遮罩层</title><script language="javascript" type="text/javascript">function showdiv() {                        document.getElementById("bg").style.display ="block";            document.getElementById("show").style.display ="block";        }function hidediv() {            document.getElementById("bg").style.display =none;            document.getElementById("show").style.display =none;        }</script><style type="text/css">        #bg{ display: none;  position: absolute;  top: 0%;  left: 0%;  width: 100%;  height: 100%;  background-color: black;  z-index:1001;  -moz-opacity: 0.7;  opacity:.70;  filter: alpha(opacity=70);}        #show{display: none;  position: absolute;  top: 25%;  left: 22%;  width: 53%;  height: 49%;  padding: 8px;  border: 8px solid #E8E9F7;  background-color: white;  z-index:1002;  overflow: auto;}</style></head><body><input id="btnshow" type="button" value="Show" onclick="showdiv();"/><div id="bg"></div><div id="show">测试<input id="btnclose" type="button" value="Close" onclick="hidediv();"/></div></body></html>