Website/Admin/Picture/Scripts/LightBox.js

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    var isIE = (document.all) ? true : false;
    var isIE6 = isIE  &&  ([/MSIE (\d)\.0/i.exec(navigator.userAgent)][0][1] == 6);
    
    var $ = function (id) { return "string" == typeof id ? document.getElementById(id) : id;};
    
    var Class = { create: function() {
        return function() { this.initialize.apply(this, arguments); }
    }}

    var Extend = function(destination, source) {
        for (var property in source) {
            destination[property] = source[property];
    }}
    
    
    var Bind = function(object, fun) {
        return function() {
            return fun.apply(object, arguments);
    }}

    var Each = function(list, fun){
    for (var i = 0, len = list.length; i < len; i++) { fun(list[i], i); }};

    var Contains = function(a, b){
    return a.contains ? a != b && a.contains(b) : !!(a.compareDocumentPosition(b) & 16);}  
    
    var OverLay = Class.create();
    OverLay.prototype = {
    initialize: function(options) 
    { 
        this.SetOptions(options);
        
        
        this.Lay = $(this.options.Lay) || document.body.insertBefore(document.createElement("div"), document.body.childNodes[0]);

        this.Color = this.options.Color;
        this.Opacity = parseInt(this.options.Opacity);
        this.zIndex = parseInt(this.options.zIndex);
        with(this.Lay.style){ display = "none"; zIndex = this.zIndex; left = top = 0; position = "fixed"; width = height = "100%"; }
        if(isIE6)
        {
            this.Lay.style.position = "absolute";
            //ie6设置覆盖层大小程序
            this._resize = Bind(this, function(){
                this.Lay.style.width = Math.max(document.documentElement.scrollWidth, document.documentElement.clientWidth) + "px";
                this.Lay.style.height = Math.max(document.documentElement.scrollHeight, document.documentElement.clientHeight) + "px";
            });
            //遮盖select
            this.Lay.innerHTML = '<iframe style="position:absolute;top:0;left:0;width:100%;height:100%;filter:alpha(opacity=0);"></iframe>'
        }
    },
  //设置默认属性
  SetOptions: function(options) 
  {
    this.options = {//默认值
        Lay:        null,//覆盖层对象
        Color:        "#333",//背景色
        Opacity:    50,//透明度(0-100)
        zIndex:        1000//层叠顺序