小程序-监听手势滑动

bindtouchstart="touchStart" //开始
bindtouchend="touchEnd"//结束

<view bindtouchstart="touchStart" bindtouchend="touchEnd" ></view>

  data: {
    touchDotX:0,//X按下时坐标
    touchDotY:0,//y按下时坐标
    interval:null,//计时器
    time:0,//从按下到松开共多少时间*100
  },

// 触摸开始事件
  touchStart: function(e) {
    this.setData({
      touchDotX: e.touches[0].pageX // 获取触摸时的原点
    })
    this.setData({
      touchDotY: e.touches[0].pageY // 获取触摸时的原点
    })
    this.setData({
      interval: setInterval(() => {
        this.setData({
          time: this.data.time++ // 获取触摸时的原点
        })
      }, 100)
    })

  },
  // 触摸结束事件
  touchEnd: function(e) {
    let touchDotX = this.data.touchDotX;//X按下时坐标
    let touchDotY = this.data.touchDotY;//y按下时坐标
    let touchMoveX = e.changedTouches[0].pageX;
    let touchMoveY = e.changedTouches[0].pageY;
    let tmX = touchMoveX - touchDotX;
    let tmY = touchMoveY - touchDotY;
    if (this.data.time < 20) {
      let absX = Math.abs(tmX);
      let absY = Math.abs(tmY);
      if (absX > 2 * absY) {
        if (tmX<0){
          console.log("左滑=====")
        }else{
          this.bindBack();
          console.log("右滑=====")
        }
      }
      if (absY > absX * 2 && tmY<0) {
        console.log("上滑动=====")
      }
    }
    clearInterval(this.data.interval); // 清除setInterval
    this.setData({
      time: 0
    })
  },