Javascript 方法错误：未定义方法名称

为什么这个代码不起作用？我正在尝试使用该方法来添加属性，然后将添加的属性分配给它自己的值

function howLongILivedSomewhere(college, home1, home2) {
    this.birthHome = 18;
    this.college = college;
    this.home1 = home1;
    this.home2 = home2;

    this.calcYearsAlive = function() {
    return birthHome + college + home1 +home2;
    };

    this.yearsAlive = calcYearsAlive();
}

var me = new howLongILivedSomewhere(4, 2, 3);

console.log(me);

---

将构造函数更新为：

function howLongILivedSomewhere(college, home1, home2) {
    this.birthHome = 18;
    this.college = college;
    this.home1 = home1;
    this.home2 = home2;

    this.calcYearsAlive = function() {
      return this.birthHome + this.college + this.home1 + this.home2;
    };

    this.yearsAlive = this.calcYearsAlive();
}

var me = new howLongILivedSomewhere(4, 2, 3);

console.log(me);

---

当您需要访问对象属性（更多详细信息）时，请使用

this

关键字。

您在方法/属性调用期间错过了

this

关键字。试试下面的方法

  function howLongILivedSomewhere(college, home1, home2) {
    this.birthHome = 18;
    this.college = college;
    this.home1 = home1;
    this.home2 = home2;

    this.calcYearsAlive = function() {
      return this.birthHome + this.college + this.home1 + this.home2;
    };

    this.yearsAlive = this.calcYearsAlive();
}

var me = new howLongILivedSomewhere(4, 2, 3);

console.log(me.yearsAlive); // output: 27

这个关键字是什么？ 与其他语言相比，函数的this关键字在JavaScript中的行为稍有不同。严格模式和非严格模式也有一些区别

参考资料：

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在方法或方法调用中使用此关键字作为well@Venkatraman非常感谢。检查我的答案，它有解决方案给你！事实上，这仍然不起作用。它给了我一个错误消息：calcYearsAlive没有定义。你说得对。答案更新。太棒了！这次成功了。谢谢你的帮助！