与你相遇好幸运，async解决循环回调问题

var count = 0;
var tmpArr = [];
async.whilst(
  function() { return count < arg.length; },
  function(callback) {
    Users.find({u_number:arg[count].u_number}).exec(function(err,resul){
      err && sails.log.error(err);
      if(resul.length == 0){
        sails.log.error(‘notfound‘);
        var tmp = "";
      }else{
        var tmp =  resul[0].properties[‘u_hometown‘]
      }
      arg[count][‘u_homwtown‘] = tmp;
      tmpArr.push(arg[count]);
      count++;
      callback(null, count);
    });
  },
  function (err, result) {
    err && sails.log.error(err);
    console.dir(result);
    console.dir(tmpArr);
  }
);