if (typeof eventType === "string" && eventType) {
        events = eventType.toLowerCase().split(/\s+/);
      } else if (typeof eventType === "object" && eventType && typeof listener === "undefined") {
        for (i in eventType) {
          if (_hasOwn.call(eventType, i) && typeof i === "string" && i && typeof eventType[i] === "function") {