简单的懒加载图片数据

        /********************************************         * 懒加载图片数据         * 作者： [e-mail]         * 时间:  2012-11-22         ********************************************/        var Lazyload = function (obj) {            this.content = $(obj);            this.min = $(document).scrollTop();            this.max = $(document).scrollTop() + $(window).height();            this.fnLoad = (function (object,handler) {                return function () {                    return handler.apply(object, arguments);                };            })(this, this.load);            this.load();            $(window).bind('scroll', this.fnLoad)                     .bind('resize', this.fnLoad);        };        Lazyload.prototype = {            load: function () {                var sT = $(document).scrollTop(), //滚动条高度                    wH = $(window).height(), //窗口高度                    cH = wH + sT,                    oLoad, top, bottom;                if (this.check(sT, cH, wH)) return;                this.img = $('img[data-img][lazy!=1]', this.content);                if (this.loaded(1).length != this.img.length) {                    oLoad = this.loaded(0);                    $.each(oLoad, function () {                        top = $(this).offset().top;                        bottom = top + $(this).outerHeight();                        if ((top > sT && top < cH) || (bottom > sT && bottom < cH)) {                            $(this).attr('lazy', 1)                                   .attr('src', $(this).attr('data-img'));                        }                    });                }                else this.endLoad();            },            loaded: function (status) {                var arr = [], temp;                status = !!status;                this.img.each(function () {                    temp = !!$(this).attr('lazy');                    if (status) {                        temp && arr.push($(this));                    }                    else {                        temp || arr.push($(this));                    }                });                return arr;            },            check: function (t, h, wh) {                if (t > this.min && h < this.max) return true;                if (t < this.min && Math.abs(this.min - t) <= wh) this.min = t;                if (h > this.max && Math.abs(this.max - h) <= wh) this.max = h;                return false;            },            endLoad: function () {                $(window).unbind('scroll', this.fnLoad)                         .unbind('resize', this.fnLoad);            }        };