【prototype】What's the output?

function Person(firstName, lastName) {
  this.firstName = firstName;
  this.lastName = lastName;
}

const member = new Person("Lydia", "Hallie");
Person.getFullName = function() {
  return `${this.firstName} ${this.lastName}`;
};

console.log(member.getFullName());

A: TypeError B: SyntaxError C: Lydia Hallie D: undefined undefined

Answer

解析： new Person()做了什么

const obj = {}
Person.call(obj, para)
obj.__proto__ = Person.prototype
return obj

思考：

如何实现输出 Lydia Hallie

参考：https://github.com/lydiahallie/javascript-questions， 11

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【prototype】What's the output? #11