code: function _initPullUp() {
        var _this4 = this;
  
        this.scroll.on('pullingUp', function () {
          if (_this4.pullUpFinally) {
            _this4.scroll.finishPullUp();
          } else {
            _this4.pullUpNow = true;
  
            _this4.$emit('pullingUp');
          }
        });
      }
docs: 初始化上拉加载