js构造函数返回值

function Person(name, age) {
  this.name = name;
  this.age = age;
}

const person = new Person('Alice', 30);
console.log(person); // 输出: Person { name: 'Alice', age: 30 }

function Car(make, model) {
  this.make = make;
  this.model = model;
  return { brand: make }; // 显式返回一个对象
}

const car = new Car('Toyota', 'Corolla');
console.log(car); // 输出: { brand: 'Toyota' }

function Person(name, age) {
  this.name = name;
  this.age = age;
  return 'This will be ignored'; // 基本类型返回值会被忽略
}

const person = new Person('Alice', 30);
console.log(person); // 输出: Person { name: 'Alice', age: 30 }

function Car(make, model) {
  this.make = make;
  this.model = model;
  return { brand: make }; // 显式返回一个对象，覆盖新创建的对象实例
}

const car = new Car('Toyota', 'Corolla');
console.log(car); // 输出: { brand: 'Toyota' }