简易的javascript遮罩层弹框,支持ie(7~10),ff,goole

// JavaScript Document
/**
 * libo/2013/12/03
 * 简易可移动遮罩层
 */
var pop = {
bodyDiv    : '',
quyuheight : '',
quyuwidth  : '',
boxDivTop  : '',
boxDivleft : '',
hidenWidth : 450,
hidenHeight: 350,
title      : ' 温馨提示',
data       : 'ffd',
setBody : function(){
pop.bodyDiv   = document.createElement('div');
pop.bodyDiv.setAttribute('id','bgDiv'); 
pop.bodyDiv.style.position   = "absolute"; 
pop.bodyDiv.style.top        = "0"; 
pop.bodyDiv.style.background = "#000000"; 
pop.bodyDiv.style.opacity    = "0.4"; 
pop.bodyDiv.style.filter     = "alpha(opacity=30)"; 
pop.bodyDiv.style.left       = "0"; 
//可见区域宽度
pop.quyuwidth  = Math.max(document.documentElement.clientWidth, document.body.clientWidth); 
//可见区域高度
pop.quyuheight = Math.max(document.documentElement.clientHeight, document.body.clientHeight);
pop.bodyDiv.style.width      = pop.quyuwidth + "px"; 
pop.bodyDiv.style.height     = pop.quyuheight + "px"; 
pop.bodyDiv.style.zIndex     = "10000"; 
document.body.appendChild(pop.bodyDiv); 
},
//遮罩层创建
creatbox : function(){
var boxDiv =  document.createElement('div');
boxDiv.setAttribute('id','boxDiv'); 
boxDiv.style.position   = "absolute"; 
boxDiv.style.zIndex     = "10100"; 
boxDiv.style.background = "#fff"; 
boxDiv.style.border     = "5px solid #333333";
boxDiv.style.height     = pop.hidenHeight + 'px';
boxDiv.style.width      = pop.hidenWidth + 'px';
boxDiv.innerHTML = 
"

"+
"

"+
"
• "+pop.title+"
"+
"
• "+
  "关闭"+
  "

"+
"

"+
"

"+ pop.data +"

";
//返回当前屏幕高度(分辨率值) 
var pingmu = window.screen.height;
if (pingmu < pop.quyuheight) {
pop.boxDivTop = (pingmu - pop.hidenHeight)/3 + 'px';
} else {
    pop.boxDivTop = (pingmu - pop.hidenHeight)/3 + 'px';
}
pop.boxDivleft    = (pop.quyuwidth - pop.hidenWidth)/2;
boxDiv.style.left =  pop.boxDivleft + 'px'; 
boxDiv.style.top  = pop.boxDivTop; 

document.body.appendChild(boxDiv);
},
//Y坐标滚动条事件动作,保持遮罩层在中央
scrolled : function(){
var topScroll  = '';
var topTmp    = parseInt(pop.boxDivTop);
if (document.documentElement && document.documentElement.scrollTop) { 
topScroll = parseInt(document.documentElement.scrollTop); 
} else if (document.body) { 
topScroll = parseInt(document.body.scrollTop); 
} 
document.getElementById('boxDiv').style.top = (topTmp + topScroll) + 'px';
},
//绑定滚动条事件
bindScroll : function(){
if (document.all) { 
window.attachEvent('onscroll', pop.scrolled);
} else { 
window.addEventListener('scroll', pop.scrolled);
}
},
lt : function () {
return {
left : document.documentElement.scrollLeft ||document.body.scrollLeft, 
top :  document.documentElement.scrollTop || document.body.scrollTop
};
},
//弹出框移动事件
moved:function(o, mvObj){
var lt = pop.lt(), d = document;
if (typeof o == 'string') {
o = document.getElementById(o);
}
if (typeof mvObj == 'string') {
mvObj = document.getElementById(mvObj);
}
o.orig_x = parseInt(o.style.left) - lt.left;
o.orig_y = parseInt(o.style.top) - lt.top;
mvObj.onmousedown = function () {
d.onmousedown = function (e) {
e = e || window.event;
var x = e.clientX + lt.left - o.offsetLeft;
var y = e.clientY + lt.top - o.offsetTop;
d.ondragstart   = "return false;";
d.onselectstart = "return false;";  
d.onselect      = "document.selection.empty();";

d.onmousemove = function (e) {
e = e || window.event;
var _left = e.clientX + lt.left - x;
var _top = e.clientY + lt.top - y;
//阻止弹出框移出网页可视化区域
if(_left < 0) {
_left = 0;
}
if(_top < 0) {
_top = 0;
}
if (( pop.hidenWidth + _left) >= pop.quyuwidth) {
_left = pop.quyuwidth - (pop.hidenWidth + 20);
}

o.style.left = _left + 'px';
o.style.top  = _top + 'px';
o.orig_x = parseInt(o.style.left) - lt.left;  
o.orig_y = parseInt(o.style.top) - lt.top; 
};

d.onmouseup = function() {  
d.onmousemove   = null;  
d.onmouseup     = null;  
d.ondragstart   = null;  
d.onselectstart = null;  
d.onselect      = null;
d.onmousedown   = null;
};
}
}
},
colose : function(){
if (document.all) { 
window.detachEvent('onscroll', pop.scrolled);
} else { 
window.removeEventListener('scroll', pop.scrolled);
}
var obj1= document.getElementById('boxDiv');
var obj2= document.getElementById('bgDiv');
obj1.innerHTML  = '';
obj2.innerHTML  = '';
var parent1 = obj1.parentNode;
var parent2 = document.body;
parent1.removeChild(obj1);
parent2.removeChild(obj2);

},

/*
* height:遮罩层高度
* width:遮罩层宽度
* titlet:遮罩层标题
* msg : 遮罩层内容
* move : 是否可移动
*/
box : function(obj){
if (obj.height) {
pop.hidenHeight = obj.height;
}
if (obj.width) {
pop.hidenWidth = obj.width;
}
if (obj.title) {
pop.title = obj.title;
}
if (obj.msg) {
pop.data = obj.msg;
}
pop.setBody();
pop.creatbox();
pop.bindScroll();
if (obj.move) {
pop.moved('boxDiv', 'boxTop');
}
}
}