javascript - 对象的 getFullYear()

Question

不确定标题，但我对对象文字值有疑问。我有一个名为“人”的对象，其中包含名字、姓氏、国籍和出生。当我初始化它时，我将一些值带入对象中，“出生”值以“YYYY-MM-DD”的形式出现，但我必须提供全年“YYYY”。

let person = {
    firstName: '',
    lastName: '',
    nationality: '',
    born: '',

    print3: function() {
    return 'My name is ' + this.firstName + ' ' + this.lastName + ' from ' + this.nationality + '.' + ' I was born ' + this.born + '.';
    },

    init: function(firstName, lastName, nationality, born) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.nationality = nationality;
        this.born = born;
    }
};

初始化:

person2.init('Henri', 'Becquerel', 'France', '1852-12-15')

预期结果应该是:

"My name is Henri Becquerel from France. I was born 1852."

我知道我必须在代码中的某个地方使用 .getFullYear 函数，但我已经尝试了所有我能想到的地方，但我没有想法。

问候

Answer 1

new Date() 将像您一样解析 ISO 8601 格式的字符串。因此，您的 init() 函数可以保存日期对象而不是字符串。然后你可以在 this.born 上调用 getFullYear():

let person = {
  firstName: '',
  lastName: '',
  nationality: '',
  born: '',

  print3: function() {
    return 'My name is ' + this.firstName + ' ' + this.lastName + ' from ' + this.nationality + '.' + ' I was born ' + this.born.getFullYear() + '.';
  },

  init: function(firstName, lastName, nationality, born) {
    this.firstName = firstName;
    this.lastName = lastName;
    this.nationality = nationality;
    this.born = new Date(born);  // create a Date object
  }
};

person.init('Henri', 'Becquerel', 'France', '1852-12-15')
console.log(person.print3())