docs: function UcWords(str) {
      if (typeof str != "string") {
          return "";
      }
      var retStr = "";
      var tmpStrList = str.split(" ");
  
      for (var index in tmpStrList) {
          if (tmpStrList.hasOwnProperty(index)) {
              retStr += UcFirst(tmpStrList[index]) + " ";
          }
      }
  
      return trim(retStr);
  }