javascript - 街道未定义javascript中的错误

Question

我是 Javascript 的初学者，我有以下代码:

let address = {
  street: 'Brighton',
  city: 'NY',
  zipcode: 121212,

  showAddress() {
    console.log(street + ' ' + city + ' ' + zipcode);// here is the issue I cannot understand why
  }
}

let address1 = address.showAddress(); 

上面的代码显示错误

Uncaught ReferenceError: street is not defined at Object.showAddress

Answer 1

在上面的 {} 充当对象文字而不是 block 。在 showAddress() 的范围内没有名为 street 的变量.

您可以使用 this 访问它，它将引用父对象。根据MDN

When a function is called as a method of an object, its this is set to the object the method is called on

let address = {
  street: 'Brighton',
  city: 'NY',
  zipcode: 121212,

  showAddress() {
    console.log(this.street + ' ' + this.city + ' ' + this.zipcode);// here is the issue I cannot understand why
  }
}

let address1 = address.showAddress();