复制
1const person = {
2	name: "Lydia Hallie",
3	hobbies: ["coding"]
4};
5
6function addHobby(hobby, hobbies = person.hobbies) {
7	hobbies.push(hobby);
8	return hobbies;
9}
10
11addHobby("running", []);
12addHobby("dancing");
13addHobby("baking", person.hobbies);
14
15console.log(person.hobbies);