1.页面代码：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title> 遮层 </title>
<script type="text/javascript" src="js/jquery-1.9.0.min.js"></script>
<script type="text/javascript" src="js/layer.js"></script>
</head>
<body>
<br>
<center><input type="button" value="显示层" onclick="showLoad(‘加载中，请稍候。。。‘);alert(‘5秒后将关闭提示层！‘);window.setTimeout(function(){closeLoad();},5000);"></center>
</body>
</html>
2.JS代码(layer.js)：
//加载遮层
function showLoad(tipInfo) {
var iWidth = 150; //弹出窗口的宽度;
var iHeight = 0; //弹出窗口的高度;
var scrolltop = 0;
var scrollleft = 0;
var cheight = 0;
var cwidth = 0;
var eTip = document.createElement(‘div‘);
eTip.setAttribute(‘id‘, ‘tipDiv‘);
eTip.style.position = ‘absolute‘;
eTip.style.display = ‘none‘;
eTip.style.border = ‘solid 0px #D1D1D1‘;
//eTip.style.backgroundColor = ‘#4B981D‘;
eTip.style.padding = ‘5px 5px‘;
eTip.style.zindex = "9999999";
if(document.body.scrollTop){//这是一个js的兼容
scrollleft=document.body.scrollLeft;
scrolltop=document.body.scrollTop;
cheight=document.body.clientHeight;
cwidth=document.body.clientWidth;
}else{
scrollleft=document.documentElement.scrollLeft;
scrolltop=document.documentElement.scrollTop;
cheight=document.documentElement.clientHeight;
cwidth=document.documentElement.clientWidth;
}
iHeight = eTip.offsetHeight;
var v_left=(cwidth-iWidth)/2 + scrollleft; //
var v_top=(cheight-iHeight)/2+ scrolltop-50;
eTip.style.left = v_left + ‘px‘;
eTip.style.top = v_top + ‘px‘;
window.onresize=function(){
if(document.body.scrollTop){
eTip.style.left = (document.body.clientWidth-iWidth)/2+document.body.scrollLeft;
eTip.style.top =(document.body.clientHeight-iHeight)/2+document.body.scrollTop-50;
}else{
eTip.style.left = (document.documentElement.clientWidth-iWidth)/2+document.documentElement.scrollLeft;
eTip.style.top =(document.documentElement.clientHeight-iHeight)/2+document.documentElement.scrollTop-50;
}
}
eTip.innerHTML = ‘<center><span style=\‘color:#238CAF; font-weight:bold; font-color:#238CAF;cursor:default; font-size:15px\‘>‘ + tipInfo + ‘</span><br><img src=\‘images/loading.gif\‘ style=\‘width:60px;height:60px;\‘ /></center>‘;
try {
document.body.appendChild(eTip);
} catch (e) { }
$("#tipDiv").css("float", "right");
$("#tipDiv").css("z-index", "999999999");
$(‘#tipDiv‘).show();
ShowMark();
}
//关闭层
function closeLoad() {
try{
$(‘#tipDiv‘).hide();
HideMark();
}catch(e){}
}
//显示蒙灰层
function ShowMark() {
var xp_mark = document.getElementById("xp_mark");
if (xp_mark != null) {
//设置DIV
xp_mark.style.left = 0 + "px";
xp_mark.style.top = 0 + "px";
xp_mark.style.position = "absolute";
xp_mark.style.backgroundColor = "#F1EDED";
xp_mark.style.zIndex = "999999998";
if (document.all) {
xp_mark.style.filter = "alpha(opacity=75)";
var Ie_ver = navigator["appVersion"].substr(22, 1);
if (Ie_ver == 6 || Ie_ver == 5) {
hideSelectBoxes();
}
}else { xp_mark.style.opacity = "0.7"; }
xp_mark.style.width = "100%";
xp_mark.style.height = "100%";
xp_mark.style.display = "block";
}else {
//页面添加div explainDiv,注意必须是紧跟body 内的第一个元素.否则IE6不正常.
$("body").prepend("<div id=‘xp_mark‘ style=‘display:none;‘></div>");
ShowMark(); //继续回调自己
}
}
//隐藏蒙灰层
function HideMark() {
var xp_mark = document.getElementById("xp_mark");
xp_mark.style.display = "none";
var Ie_ver = navigator["appVersion"].substr(22, 1);
if (Ie_ver == 6 || Ie_ver == 5) {
showSelectBoxes();
}
}
动态gif图片：
效果图：
原文：http://my.oschina.net/u/658145/blog/311688