页面的懒加载

        'lazyQueue': {},
        'isVisiable': function(elem) {
            if (!elem) return false;
            // console.log(($(window).scrollTop()+"::"+($(elem).offset().top+$(elem).outerHeight()))+"::"+(($(window).scrollTop()+$(window).height())+"::"+$(elem).offset().top))
            return ($(window).scrollTop() <= ($(elem).offset().top + $(elem).outerHeight())) && (($(window).scrollTop() + $(window).height()) > $(elem).offset().top);
        },
        'lazyload': function(elem, htmlcode, item, cb) {
            elem.html(htmlcode.html);
            elem.css('display', 'block');
            if (elem && elem.length != 0) {
                var top = elem.offset().top;

                if (this.isVisiable(elem)) {
                    this.showImg(elem);
                    cb && cb.apply(this, arguments);
                    return;
                }
                if (this.lazyQueue[top]) {
                    this.lazyQueue[top].push({
                        'elem': elem,
                        'html': htmlcode,
                        'item': item,
                        'loaded': false,
                        'callback': cb
                    });
                } else {
                    this.lazyQueue[top] = [{
                        'elem': elem,
                        'loaded': false,
                        'callback': cb
                    }];
                }
            }

        },
        'showImg': function(elem) {
            var imgs = elem.find('img');
            for (var i = 0; i < imgs.length; i++) {
                $(imgs[i]).attr('src', $(imgs[i]).attr('data-src')).fadeIn(500);
            }
        },

?

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$(window).bind("scroll", function() {        var Ad = LETV.using('Plugin').AD;        if (Ad.lazySt)            clearTimeout(Ad.lazySt);        Ad.lazySt = setTimeout(function() {            var curHeight = $(window).height() + $(window).scrollTop(),                lazyQueue = Ad.lazyQueue;            for (var key in lazyQueue) {                if (lazyQueue.hasOwnProperty(key)) {                    var item = lazyQueue[key];                    if (!item) continue;                    for (var j = 0; j < item.length; j++) {                        var mItem = item[j];                        if (mItem && !mItem.loaded && Ad.isVisiable(mItem.elem)) {                            if (mItem.loaded === false) {                                mItem.cb && typeof mItem.cb == 'function' && mItem.cb();                                Ad.showImg(mItem.elem);                                mItem.loaded = true;                            } else {                                mItem = null;                            }                        }                    }                }            }          }, 200);    });