要求在css和js下解决不知有没可能??
<!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=gb2312" /><title>无标题文档</title><style>body{ margin: 0px; padding: 0px;}#box{ margin-top: 500px; margin-left: 200px;}#top{ margin-top: 100px; margin-left: 300px;}#bottom{ margin-top: 1240px; margin-left: 300px;}#sig{ height: 20px; width: 90px; margin-left: 100px; margin-top: 100px; background-color: #0066FF; font-weight: bold; color: #FFFFFF;}#ajax{ background-color: #CCCCCC; position: absolute; z-index: 9999; left: 0px; top: 0px; right: 0px; bottom: 0px;}</style></head><body><div onclick="ec()" id="sig">点击注册</div><div id="top">求这能看到(要求灰色背景在的前提下)</div><div id="box">求这能看到(要求灰色背景在的前提下)</div><div id="bottom">求这也能看到</div></body><script>function $(x){ return document.getElementById(x);}function ec() {if($('ajax')){$('ajax').parentNode.removeChild($('ajax'));} var div = document.createElement("div") div.setAttribute("id", "ajax"); div.style.height =document.body.clientHeight+"px"; //定位 div.style.width =document.body.clientWidth+"px"; document.body.appendChild(div); $('ajax').innerHTML="<b>aaaaaaaaaaaaaaaa </b>" }</script></html>
方法一
使用
opacity
filter
确实有遮罩的效果，即 页面的button click不能触发
产生的问题是， 遮罩层上的文字也会产生透明的效果
#ajax{ background-color: #CCCCCC; position: absolute; z-index: 9999; left: 0px; top: 0px; right: 0px; bottom: 0px; opacity:.4; filter:alpha(opacity=40); }#ajax{ background-color: #CCCCCC; position: absolute; z-index: 9999; left: 0px; top: 0px; right: 0px; bottom: 0px; background-color:rgba(0,0,0,.4); filter:progid:DXImageTransform.Microsoft.Gradient(GradientType=0, StartColorStr='#4c000000', EndColorStr='#4c000000');} div.style.height =document.body.clientHeight+"px"; //定位
div.style.width =document.body.clientWidth+"px";
div.style.filter = "alpha(opacity=50)"; //IE
div.style.opacity = ".50"; //chromeium
document.body.appendChild(div);
$('ajax').innerHTML="aaaaaaaaaaaaaaaa "
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