npm install @dreamland/react-lazy-img --save INSTALL
import LazyImg from '@dreamland/react-lazy-img' USEAGE
<LazyImg src='imgurl' alt='lazyimg' />
PARAMS
@param src {!url}
@param alt {!string}
@param transElement {?selector} 需要绑定transitionend触发图片加载的dom selector,为空则不监听该事件
@param scroller {?selector} 需要绑定scroll触发图片加载的dom selector,默认为document