code: function(mescroll, downwarp) {
  				//初始化完毕的回调,可缓存dom
  				mescroll.downOnLoadDom = downwarp.getElementsByClassName("downwarp-onload")[0];
  				mescroll.downUnloadDom = downwarp.getElementsByClassName("downwarp-unload")[0];
  				mescroll.downTipDom = downwarp.getElementsByClassName("downwarp-tip")[0];
  				mescroll.downArrowDom = downwarp.getElementsByClassName("downwarp-arrow")[0];
  			}
docs: 布局内容