Javascript 对象构造函数和 boolean 变量

Question

我正在尝试创建一个 JS 对象构造函数，但想使用 boolean 运算声明该对象的属性之一。不知怎的，我弄错了 - 请指教!

谢谢!交流

function Student(gender, name, id, age, likes) {
this.gender = gender;
this.name = name;
this.id = id;
this.age = Boolean () {
    var age = x;
    if (age >= 21) {
    return "adult";
    } else {
    return "minor";
  }     
  };
this.likes = likes;
 }

window.onload = init;

function init() {
var jessica = new Student("female", "Jessica", 12, 21, ["butterflies", "flowers", "music"]);
var jessicaJSON = JSON.stringify(jessica);
console.log(jessicaJSON);

var anotherJessica = JSON.parse(jessicaJSON);
console.log(anotherJessica);

}

Answer 1

这是为您固定的学生功能。使用三元 if 语句而不是“Boolean() {}”，这实际上不是有效的 Javascript 代码 + boolean 值要么是 true 要么是 false，您返回了“adult”或“minor”，它们是字符串，并且与无论如何， boolean 类型。

function Student(gender, name, id, age, likes) {
  this.gender = gender;
  this.name = name;
  this.id = id;
  this.likes = likes;
  this.age = (age >= 21 ? "adult" : "minor");
}