小程序监听屏幕滑动事件

<view  bindtouchstart="touchStart" bindtouchend="touchEnd">
	<!--待监听功能模块-->
</view>

    touchStart(e) {
      console.log(e)
      var that = this;
      that.setData({
        touchx: e.changedTouches[0].clientX,
        touchy: e.changedTouches[0].clientY
      })
    },
    touchEnd(e) {
      console.log(e)
      var that = this;
      let x = e.changedTouches[0].clientX;
      let y = e.changedTouches[0].clientY;
      let turn = "";
      if (x - that.data.touchx > 50 && Math.abs(y - that.data.touchy) < 50) {      //右滑
        turn = "right";
      } else if (x - that.data.touchx < -50 && Math.abs(y - that.data.touchy) < 50) {   //左滑
        turn = "left";
      }
      if(y - that.data.touchy > 50 && Math.abs(x - that.data.touchx) < 50){ //下滑
        turn = "down";
      }else if(y - that.data.touchy < -50 && Math.abs(x - that.data.touchx) < 50){ //上滑
        turn="up";
      }
      //根据方向进行操作
      if(turn == 'down'){
        //下滑触发操作
      }
    },