code: function pullUpTxt() {
        var moreTxt = this.pullUpConfig && this.pullUpConfig.txt && this.pullUpConfig.txt.more;
        var noMoreTxt = this.pullUpConfig && this.pullUpConfig.txt && this.pullUpConfig.txt.noMore;
        return this.pullUpFinally ? noMoreTxt : moreTxt;
      }
docs: 上拉的文本