我正在使用Node.JS并且有两个我通过回调移动的对象。我想出了一个解决方案来维护对正确对象的范围引用。我想弄清楚是否有更好的方法来做到这一点,或者这是不是很好的做法。
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();
答案 0 :(得分: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();
除非你在函数中需要它,否则你不需要那些愚蠢的bossReference