text: /**
   * Created by haoxiao on 2017-05-29.
   */
  let parallel = require('async');
  parallel.parallel([function (callback) {
      setTimeout(function () {
          console.log(1);
          callback(null,1)
      },3000)
  },function (callback) {
      setTimeout(function () {
          console.log(2);
          callback(null,2)
      },2000)
  },function (callback) {
      setTimeout(function () {
          console.log(3);
          callback(null,4);
      },1000)
  }
  ],function (err,result) {
      console.log(err);
      console.log(result);
  });