code: function(mescroll, downwarp) {
  				//初始化完毕的回调,可缓存dom
  				mescroll.downCircleDom = downwarp.getElementsByClassName("downwarp-circle")[0];
  				mescroll.downBallDom = downwarp.getElementsByClassName("downwarp-ball")[0];
  			}
docs: 布局内容