js来实现popup的生成，带钟罩，可移动popup，点击body可自动消失

核心代码

var errorCode="111";

var errorMsg = "error";

var neirong = "<table style='margin: auto; border: 1px solid rgb(204, 204, 204); border-image: none; 400px;'>"+
"<tr class='clsHeadingFont'><td style='border-top- 0px;'><td style='border-top- 0px;color: red; font-weight: bold;'>Error</td><td colspan='2' style='border-top- 0px;'></td></tr>" +
"<tr><td width='100%' height='0.5' style='background-color: rgb(204, 204, 204);' colspan='4'></td></tr>"+
"<tr ><td style='color: red; font-weight: bold;'></td><td style='color: red; font-weight: bold;'>Code</td><td colspan='2' style='color: red; font-weight: bold;'>Message</td></tr>"+
"<tr ><td style='padding-bottom: 230px;'>"+ errorCode+ "</td><td colspan='2' style='padding-bottom: 230px;'>"+ errorMsg+ "</td></tr>"+
"<tr><td width='100%' height='0.5' style='background-color: rgb(204, 204, 204);' colspan='4'></td></tr>"+
"<tr ><td colspan='2' ></td><td style='padding-left: 50px;padding-top: 15px; padding-bottom: 15px;'><a href='javaScript:fnClose()' id='closeButton'>Close</a></td><td colspan='1'></td></tr></table>";

cwxbox.box.show(neirong);

function fnClose(){
cwxbox.box.hide();
}
var cwxbox = {};
cwxbox.box = function(){
var bg,wd,cn,ow,oh,o = true,time = null;
return {
show:function(c,t,w,h){
if(o){
bg = document.createElement('div'); bg.id = 'cwxBg';
wd = document.createElement('div'); wd.id = 'cwxWd';
cn = document.createElement('div'); cn.id = 'cwxCn';
document.body.appendChild(bg);
document.body.appendChild(wd);
wd.appendChild(cn);
bg.onclick = cwxbox.box.hide;
window.onresize = this.init;
window.onscroll = this.scrolls;
o = false;
}
if(w && h){
var inhtml = '<iframe src="'+ c +'" width="'+ w +'" height="'+ h +'" frameborder="0"></iframe>';
}else{
var inhtml = c;
}
cn.innerHTML = inhtml;
oh = this.getCss(wd,'offsetHeight');
ow = this.getCss(wd,'offsetWidth');
this.init();
this.alpha(bg,50,1);
this.drag(wd);
if(t){
time = setTimeout(function(){cwxbox.box.hide()},t*1000);
}
},
hide:function(){
cwxbox.box.alpha(wd,0,-1);
clearTimeout(time);
},
init:function(){
bg.style.height = cwxbox.page.total(1)+'px';
bg.style.width = '';
bg.style.width = cwxbox.page.total(0)+'px';
var h = (cwxbox.page.height() - oh) /2;
wd.style.top=(h+cwxbox.page.top())+'px';
wd.style.left=(cwxbox.page.width() - ow)/2+'px';
},
scrolls:function(){
var h = (cwxbox.page.height() - oh) /2;
wd.style.top=(h+cwxbox.page.top())+'px';
},
alpha:function(e,a,d){
clearInterval(e.ai);
if(d==1){
e.style.opacity=0;
e.style.filter='alpha(opacity=0)';
e.style.display = 'block';
}
e.ai = setInterval(function(){cwxbox.box.ta(e,a,d)},40);
},
ta:function(e,a,d){
var anum = Math.round(e.style.opacity*100);
if(anum == a){
clearInterval(e.ai);
if(d == -1){
e.style.display = 'none';
if(e == wd){
this.alpha(bg,0,-1);
}
}else{
if(e == bg){
this.alpha(wd,100,1);
}
}
}else{
var n = Math.ceil((anum+((a-anum)*.5)));
n = n == 1 ? 0 : n;
e.style.opacity=n/100;
e.style.filter='alpha(opacity='+n+')';
}
},
getCss:function(e,n){
var e_style = e.currentStyle ? e.currentStyle : window.getComputedStyle(e,null);
if(e_style.display === 'none'){
var clonDom = e.cloneNode(true);
clonDom.style.cssText = 'position:absolute; display:block; top:-3000px;';
document.body.appendChild(clonDom);
var wh = clonDom[n];
clonDom.parentNode.removeChild(clonDom);
return wh;
}
return e[n];
},
drag:function(e){
var startX,startY,mouse;
mouse = {
mouseup:function(){
if(e.releaseCapture)
{
e.onmousemove=null;
e.onmouseup=null;
e.releaseCapture();
}else{
document.removeEventListener("mousemove",mouse.mousemove,true);
document.removeEventListener("mouseup",mouse.mouseup,true);
}
},
mousemove:function(ev){
var oEvent = ev||event;
e.style.left = oEvent.clientX - startX + "px";
e.style.top = oEvent.clientY - startY + "px";
}
}
e.onmousedown = function(ev){
var oEvent = ev||event;
startX = oEvent.clientX - this.offsetLeft;
startY = oEvent.clientY - this.offsetTop;
if(e.setCapture)
{
e.onmousemove= mouse.mousemove;
e.onmouseup= mouse.mouseup;
e.setCapture();
}else{
document.addEventListener("mousemove",mouse.mousemove,true);
document.addEventListener("mouseup",mouse.mouseup,true);
}
}

}
}
}()

cwxbox.page = function(){
return{
top:function(){return document.documentElement.scrollTop||document.body.scrollTop},
function(){return self.innerWidth||document.documentElement.clientWidth||document.body.clientWidth},
height:function(){return self.innerHeight||document.documentElement.clientHeight||document.body.clientHeight},
total:function(d){
var b=document.body, e=document.documentElement;
return d?Math.max(Math.max(b.scrollHeight,e.scrollHeight),Math.max(b.clientHeight,e.clientHeight)):
Math.max(Math.max(b.scrollWidth,e.scrollWidth),Math.max(b.clientWidth,e.clientWidth))
}
}
}()

CSS控制popup的大小，可以根据需求来调节

<style type="text/css">
#cwxBg{ position:absolute; display:none; background:#000; 100%; height:100%; left:0px; top:0px; z-index:1000;}
#cwxWd{ position:absolute; display:none; border:3px solid #CCC; padding:10px;background:#FFF; z-index:1500;450px;height:350px;}
#cwxCn{ background:#FFF; display:block;}
</style>