My proto“mike”实例的引用指向“Student”，但正如其名称显示“Person”，我不知道为什么会这样。下面是我的代码和控制台的屏幕截图：
const Person = function (firstName,birthYear) {
this.firstName = firstName;
this.birthYear = birthYear;
}
Person.prototype.calcAge = function () {
console.log(2037 - this.birthYear);
}
const Student = function (firstName, birthYear, course){
Person.call(this,firstName,birthYear);
this.course = course;
};
Student.prototype = Object.create(Person.prototype)
Student.prototype.constructor = Student;
Student.prototype.introduce = function () {
console.log(`My name is ${this.firstName} and ,I study ${this.course}`);
}
const mike = new Student('Mike',2020, 'Computer Science');
console.log(mike);当我检查控制台时，它显示人员：
Student.prototype = Object.create(Person.prototype)在这种情况下，您将创建一个新对象并使其值为Student.prototype。新对象Student has Person.prototype作为它的原型。