Page({
 
  /**
   * 页面的初始数据
   */
  data: {
    scrollindex: 0,  //当前页面的索引值
    totalnum: 4,  //总共页面数
    starty: 0,  //开始的位置x
    endy: 0, //结束的位置y
    critical: 80, //触发翻页的临界值
    margintop: 0,  //滑动下拉距离
  },
  scrollTouchstart: function (e) {
    let py = e.touches[0].pageY;
    console.log(py);
    this.setData({
      starty: py
    })
  },
  scrollTouchend: function (e) {
    let py = e.changedTouches[0].pageY;
    let d = this.data;
    this.setData({
      endy: py,
    })
    console.log(e.changedTouches[0].pageY, d.starty);
    if (py - d.starty > d.critical && d.scrollindex > 0) {
      this.setData({
        scrollindex: d.scrollindex - 1
      })
    } else if (py - d.starty < -(d.critical) && d.scrollindex < this.data.totalnum - 1) {
      this.setData({
        scrollindex: d.scrollindex + 1
      })
    }
    this.setData({
      starty: 0,
      endy: 0,
      margintop: 0
    })
  },
  goIndex(){
    wx.navigateTo({
      url: '/pages/index/index',
    })
  },
  goMy(){
    wx.navigateTo({
      url: '/pages/personal/personal',
    })
  }
})