LazyLoad 懒加载控件。 Usage 123456789101112var widget = require('saber-widget');require('saber-widget/LazyLoad');var lazyload = widget.lazyLoad();lazyload.on('load', function (ev, node) { console.info('load', node);});lazyload.on('complete', function () { console.info('complete');}); API Methods refresh() 强制重新获取懒加载元素