code: function fnTouchmove (e) {
      var me = this
      var options = me._options
      var domUp = options.domUp
      me._curY = e.touches[ 0 ].pageY
      me._moveY = me._curY - me._startY
  
      if (me._moveY > 0) {
        me.direction = 'up'
      } else if (me._moveY < 0) {
        me.direction = 'down'
      }
  
      var _absMoveY = Math.abs(me._moveY)
  
      // 加载上方
      if (options.loadUpFn != ''
        && me.touchScrollTop <= 0
        && me.direction == 'up'
      ) {
        e.preventDefault()
        fnTransition(domUp.dom, 0)
  
        if (_absMoveY <= domUp.getDistance()) {
          // 下拉
        } else if (_absMoveY > domUp.getDistance()
          && _absMoveY <= domUp.getDistance() * 2) {
          // 指定距离 < 下拉距离 < 指定距离*2
          _absMoveY = domUp.getDistance() + (_absMoveY - domUp.getDistance()) * 0.5
        } else {
          // 下拉距离 > 指定距离*2
          _absMoveY = domUp.getDistance() + domUp.getDistance() * 0.5 + (_absMoveY - domUp.getDistance() * 2) * 0.2
        }
        domUp.dom.style.height = _absMoveY + "px"
        domUp.pullingCall(_absMoveY)
  
      }
    }
docs: touchmove