code: function _$setMulti(keyMap) {
          if (_destroy) return _destroyNotice()
  
          if (!keyMap || $type(keyMap) != OBJECT) return
          var changes = []
          $util.objEach(keyMap, function (key, item) {
              var cg = _$set(key, item, true)
              if (cg) changes.push(cg)
          })
  
          changes.forEach(function (args) {
              _emitChange.apply(null, args)
          })
      }
docs: sync props's value in batch and trigger change event
  @param keyMap <Object> properties object