code: function modFireDefined( id ) {
          var listeners = modDefinedListener[ id ] || [];
          var len = listeners.length;
          while ( len-- ) {
              var listener = listeners[ len ];
              listener && listener();
          }
  
          // 清理listeners
          listeners.length = 0;
          delete modDefinedListener[ id ];
      }
docs: 派发模块定义完成事件
  
  @ignore
  @param {string} id 模块标识