之前使用scroll-view实现组件内部的滚动，但是因为canvas导致不得不使用cover-view，但是cover-view中不支持scroll-view，所以只能手写组件内部上下滚动，主要是解决手指上下拖动其内容。

    但是因为监听touchmove导致不断更新Animation.translateY,在真机上测试出现非常严重的卡顿，到了无法忍受的地步，

代码略丑，如有想法可以提出

flootTouchStart: function(e){     // console.log(e.touches[0].clientY)     this.setData({       floorTouchStart: e.touches[0]     })   },   flootTouchMove: function(e) {     // const flootTouchStartX = this.data.floorTouchStart.clinetX;     const flootTouchStartY = this.data.floorTouchStart.clientY;     // console.log(flootTouchStartY);       // const flootMoveX = e.touches[0].clinetX;     const floorMoveY = e.touches[0].clientY;       let curMove = floorMoveY - flootTouchStartY;     this.setData({       floorTouchStart: e.touches[0]     })           if (this.data.floorList.length > 5 ) {               if (this.data.floorMove > -(this.data.floorList.length - 5) * 32 && curMove < 0 ) { // 向下滚                   // console.log(curMove);         this.setData({           floorMove: curMove + this.data.floorMove         })       } else if (this.data.floorMove < 0 && curMove > 0) { // 向上滚         this.setData({           floorMove: curMove + this.data.floorMove         })       }     }     console.log('xx' + curMove)     this.floorAnimation.translateY(this.data.floorMove).step()     this.setData({       floorAnimationData: this.floorAnimation.export()     })         },

// index.wxml <cover-view class='chooseFloor' wx:if="{{chooseFloorShow}}" catchtouchstart='flootTouchStart' catchtouchmove='flootTouchMove'>         <cover-view animation="{{floorAnimationData}}" class='inner-container'>           <cover-view           wx:for="{{floorList}}"           wx:key="{{index}}"           data-num="{{index}}"           class='floorItem {{curFloor == item?"curfloor": ""}}'           bindtap='confirmFloor'>             <cover-view>{{item}}</cover-view>           </cover-view>         </cover-view>       </cover-view>