code: function (paintAll) {
  
          var list = this.storage.getDisplayList(true);
  
          var zlevelList = this._zlevelList;
  
          this._redrawId = Math.random();
  
          this._paintList(list, paintAll, this._redrawId);
  
          // Paint custum layers
          for (var i = 0; i < zlevelList.length; i++) {
              var z = zlevelList[i];
              var layer = this._layers[z];
              if (!layer.__builtin__ && layer.refresh) {
                  var clearColor = i === 0 ? this._backgroundColor : null;
                  layer.refresh(clearColor);
              }
          }
  
          this.refreshHover();
  
          return this;
      }
docs: 刷新
  @param {boolean} [paintAll=false] 强制绘制所有displayable