code: function merge(_old, _new) {
          for (var i in _new) {
              if (_new.hasOwnProperty(i)) {
                  _old[i] = _new[i];
              }
          }
          return _old;
      }
docs: 简单merge两个对象
  @param {object} _old
  @param {object} _new
  @returns {*}