先上代码：

var __mplayer_process;

function __loop(keys,mplayer){
  jingCore.search(keys,function(results){
      logger.correct('播放中>>');
        mplayer = exec('mplayer -slave -quiet '+results.toString().replace(/,/g,' '),{
        maxBuffer:20000*1024
      },function(error,stdout,stderr){
        if(error)
          logger.error('error occur');

        logger.correct('finished and next list is coming');
        return __loop(keys,mplayer);
      })
    })
}

__loop(‘a’,__mplayer_process)的时候内层无法传递mplayer参数。