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以下为引用的内容：
Function.prototype.binding = function() {
if (arguments.length < 2 && typeof arguments[0] == "undefined") return this;
var __method = this, args = jQuery.makeArray(arguments), object = args.shift();
return function() {
return __method.apply(object, args.concat(jQuery.makeArray(arguments)));
}
}
var Class = function(subclass){
subclass.setOptions = function(options){
this.options = jQuery.extend({}, this.options,options);
for(var key in options){
if(/^on[A-Z][A-Za-z]*$/.test(key)){
$(this).bind(key,options[key]);
}
}
}
var fn = function(){
if(subclass._init && typeof subclass._init == 'function'){
this._init.apply(this,arguments);
}
}
if(typeof subclass == 'object'){
fn.prototype = subclass;
}
return fn;
}
var PopupLayer = new Class({
options:{
trigger:null, //触发的元素或id,必填参数
popupBlk:null, //弹出内容层元素或id,必填参数
closeBtn:null, //关闭弹出层的元素或id
popupLayerClass:"popupLayer", //弹出层容器的class名称
eventType:"click", //触发事件的类型
offsets:{ //弹出层容器位置的调整值
x:0,
y:0
},
useFx:false, //是否使用特效
useOverlay:false, //是否使用全局遮罩
usePopupIframe:true, //是否使用容器遮罩
isresize:true, //是否绑定window对象的resize事件
onBeforeStart:function(){} //自定义事件
},
_init:function(options){
this.setOptions(options); //载入设置
this.isSetPosition = this.isDoPopup = this.isOverlay = true; //定义一些开关
this.popupLayer = $(document.createElement("div")).addClass(this.options.popupLayerClass); //初始化最外层容器
this.popupIframe = $(document.createElement("iframe")).attr({border:0,frameborder:0}); //容器遮罩,用于屏蔽ie6下的select
this.trigger = $(this.options.trigger); //把触发元素封装成实例的一个属性，方便使用及理解
this.popupBlk = $(this.options.popupBlk); //把弹出内容层元素封装成实例的一个属性
this.closeBtn = $(this.options.closeBtn); //把关闭按钮素封装成实例的一个属性
$(this).trigger("onBeforeStart"); //执行自定义事件。
this._construct() //通过弹出内容层，构造弹出层，即为其添加外层容器及底层iframe
this.trigger.bind(this.options.eventType,function(){ //给触发元素绑定触发事件
if(this.isSetPosition){
this.setPosition(this.trigger.offset().left + this.options.offsets.x, this.trigger.offset().top + this.trigger.get(0).offsetHeight + this.options.offsets.y);
}
this.options.useOverlay?this._loadOverlay():null; //如果使用遮罩则加载遮罩元素
(this.isOverlay && this.options.useOverlay)?this.overlay.show():null;
if(this.isDoPopup && (this.popupLayer.css("display")== "none")){
this.options.useFx?this.doEffects("open"):this.popupLayer.show();
}
}.binding(this));
this.isresize?$(window).bind("resize",this.doresize.binding(this)):null;
this.options.closeBtn?this.closeBtn.bind("click",this.close.binding(this)):null; //如果有关闭按钮，则给关闭按钮绑定关闭事件
},
_construct:function(){ //构造弹出层
this.popupBlk.show();
this.popupLayer.append(this.popupBlk.css({opacity:1})).appendTo($(document.body)).css({position:"absolute",'z-index':2,width:this.popupBlk.get(0).offsetWidth,height:this.popupBlk.get(0).offsetHeight});
this.options.usePopupIframe?this.popupLayer.append(this.popupIframe):null;
this.recalculatePopupIframe();
this.popupLayer.hide();
},
_loadOverlay:function(){ //加载遮罩
pageWidth = ($.browser.version=="6.0")?$(document).width()-21:$(document).width();
this.overlay?this.overlay.remove():null;
this.overlay = $(document.createElement("div"));
this.overlay.css({position:"absolute","z-index":1,left:0,top:0,zoom:1,display:"none",width:pageWidth,height:$(document).height()}).appendTo($(document.body)).append("<div style='position:absolute;z-index:2;width:100%;height:100%;left:0;top:0;opacity:0.3;filter:Alpha(opacity=30);background:#000'></div><iframe frameborder='0' border='0' style='width:100%;height:100%;position:absolute;z-index:1;left:0;top:0;filter:Alpha(opacity=0);'></iframe>")
},
doresize:function(){
this.overlay?this.overlay.css({width:($.browser.version=="6.0")?$(document).width()-21:$(document).width(),height:($.browser.version=="6.0")?$(document).height()-4:$(document).height()}):null;
if(this.isSetPosition){
this.setPosition(this.trigger.offset().left + this.options.offsets.x, this.trigger.offset().top + this.trigger.get(0).offsetHeight + this.options.offsets.y);
}
},
setPosition:function(left,top){ //通过传入的参数值改变弹出层的位置
this.popupLayer.css({left:left,top:top});
},
doEffects:function(way){ //做特效
way == "open"?this.popupLayer.show("slow"):this.popupLayer.hide("slow");
},
recalculatePopupIframe:function(){ //重绘popupIframe,这个不知怎么改进，只好先用这个笨办法。
this.popupIframe.css({position:"absolute",'z-index':-1,left:0,top:0,opacity:0,width:this.popupBlk.get(0).offsetWidth,height:this.popupBlk.get(0).offsetHeight});
},
close:function(){ //关闭方法
this.options.useOverlay?this.overlay.hide():null;
this.options.useFx?this.doEffects("close"):this.popupLayer.hide();
}
});
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