docs: function (enable) {
              if (enable && !this._isIE7OrLess) {
                  this.$logWarn(this.INVALID_HASHPOLLING_TRIGGER);
              }
              enable = enable && this._isIE7OrLess;
              if (enable && !this._enableIEpolling) {
                  this._enableIEpolling = enable;
                  this._hashPoll();
              } else {
                  this._enableIEpolling = enable;
              }
          }