const person = { name: 'Lydia' }function sayHi(age) { console.log(`${this.name} is ${age}`)}sayHi.call(person, 21)sayHi.bind(person, 21)- A:
undefined is 21Lydia is 21 - B:
functionfunction - C:
Lydia is 21Lydia is 21 - D:
Lydia is 21function
参考答案
const person = { name: 'Lydia' }function sayHi(age) { console.log(`${this.name} is ${age}`)}sayHi.call(person, 21)sayHi.bind(person, 21)undefined is 21 Lydia is 21function functionLydia is 21 Lydia is 21Lydia is 21 function参考答案