习题二

1. 哪个方法会返回 'Hello world'

const myMap = new Map();
const myFunc = () => "greeting";
myMap.set(myFunc, "Hello world");
//1
myMap.get("greeting");
//2
myMap.get(myFunc);
//3
myMap.get(() => "greeting");

2. 选择以下代码输出值

const items = ["a", "b", "c"];
({ item: items[3] } = { item: "d" });
console.log(items);

3. 选择以下代码输出值

const person = { name: "Lydia" };
function sayHi(age) {
  console.log(`${this.name} is ${age}`);
}
sayHi.call(person, 21);
sayHi.bind(person, 21);