Node.js-在回调之间管理JavaScript作用域的更好方法？

Question

我正在使用Node.JS，并通过回调在两个对象之间移动。 我想出了一种解决方案，以维护对正确对象的范围引用。 我正在尝试确定是否有更好的方法可以做到这一点，或者这是一种好的做法。

function Worker () {}

Worker.prototype.receiveJob = function(callback, bossReference) {
  this.doJob(callback, bossReference);
};

Worker.prototype.doJob = function(callback, bossReference) {
  callback.call(bossReference);
  // callback(); // this will not work
};

function Boss () {
  this.worker = new Worker();
}

Boss.prototype.delegateJob = function() {
  this.worker.receiveJob(this.whenJobCompleted, this);
};

Boss.prototype.whenJobCompleted = function() {
  this.sayGoodJob();
};

Boss.prototype.sayGoodJob = function() {
  console.log('Good job');
};

var boss = new Boss();
boss.delegateJob();

Answer 1

使用Function.prototype.bind()

function Worker () {}

Worker.prototype.receiveJob = function(callback) {
  this.doJob(callback);
};

Worker.prototype.doJob = function(callback) {
  callback()
};

function Boss () {
  this.worker = new Worker();
}

Boss.prototype.delegateJob = function() {
  this.worker.receiveJob(this.whenJobCompleted.bind(this));
};

Boss.prototype.whenJobCompleted = function() {
  this.sayGoodJob();
};

Boss.prototype.sayGoodJob = function() {
  console.log('Good job');
};

var boss = new Boss();
boss.delegateJob();

你将不再需要那些愚蠢的bossReference小号aftewards除非你需要在你的功能