code: function kv2List( source ) {
          var list = [];
          for ( var key in source ) {
              if ( source.hasOwnProperty( key ) ) {
                  list.push( {
                      k: key,
                      v: source[ key ]
                  } );
              }
          }
  
          return list;
      }
docs: 将对象数据转换成数组，数组每项是带有k和v的Object
  
  @ignore
  @param {Object} source 对象数据
  @return {Array.<Object>}