instanceof 运算符用于检测构造函数的 prototype 属性是否出现在某个实例对象的原型链上。
function Car(make, model, year) {
this.make = make;
this.model = model;
this.year = year;
}
const auto = new Car('Honda', 'Accord', 1998);
console.log(auto instanceof Car);
// expected output: true
console.log(auto instanceof Object);
// expected output: true
