复制
1class Dog {
2  constructor(name) {
3    this.name = name;
4  }
5}
6
7Dog.prototype.bark = function() {
8  console.log(`Woof I am ${this.name}`);
9};
10
11const pet = new Dog("Mara");
12
13pet.bark();
14
15delete Dog.prototype.bark;
16
17pet.bark();