return fs.readFile

@lian774739140 还是报同样的错

var dfd = Q.defer();
fs.readFile(path, function(err, data) {
  if(err) {
    dfd.reject(err);
  }else {
    dfd.resolve(data);
  }
});
return dfd.promise;

读这篇文章 https://cnodejs.org/topic/560dbc826a1ed28204a1e7de