我想实现一个列表的下拉刷新，但是scroll-view没法做过渡动画，因此使用监听touch事件的方式手动实现。但是每次touchstart后的第一次监听到touchmove事件时，都是移动了至少30个坐标，请问是我使用有问题还是本来微信的设计就是如此? // wxml <scroll-view scroll-y="true" scroll-top="{{scrollTop}}" bindtouchstart="touchstart"     bindtouchend="touchend"     catchtouchmove="touchmove"     bindscroll="scroll"     bindscrolltoupper="refresh"     bindscrolltolower="getmore"   >     <view class="loading" style="height:{{refreshHeight}}px;transition-duration:{{loadingTime}}s">       load     </view>     <view style="height：100%">       <view class="item" wx:for="{{list}}" wx:key="text">             <text class="description">{{item.text}}</text>         </view>     </view>     </scroll-view> // js   touchstart:function(event){    console.log("touch-start");     console.log(event.touches[0].pageY);     if(this.data.scrollTop==0){       this.setData({startY:event.touches[0].pageY,touchNum:this.data.touchNum+1})     }   },   touchend:function(event){     console.log("touch-end");     if(event.touches.length==0)       this.setData({refreshHeight:20,loadingTime:0.2})   },   touchmove:function(event){     if(this.data.scrollTop==0){       var changeY=(event.touches[0].pageY-this.data.startY)*1.5;       console.log("changeY-before",changeY);       var newH=this.data.refreshHeight+changeY;       newH=(newH>=20?newH:20);       newH=(newH<=150?newH:150);       changeY=changeY>0?changeY:-changeY;       this.setData({loadingTime:changeY*0.01});       this.setData({refreshHeight:newH,startY:event.touches[0].pageY});     }   } [图片][图片][图片]