155个JavaScript基础问题（11-20）

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());

function Person(firstName, lastName) {
  this.firstName = firstName
  this.lastName = lastName
}
const lydia = new Person('Lydia', 'Hallie')
const sarah = Person('Sarah', 'Smith')
console.log(lydia)
console.log(sarah)

function sum(a, b) {
  return a + b
}
sum(1, '2')

let number = 0
console.log(number++)
console.log(++number)
console.log(number)

function getPersonInfo(one, two, three) {
  console.log(one)
  console.log(two)
  console.log(three)
}
const person = 'Lydia'
const age = 21
getPersonInfo`${person} is ${age} years old`

function checkAge(data) {
  if (data === { age: 18 }) {
    console.log('You are an adult!')
  } else if (data == { age: 18 }) {
    console.log('You are still an adult.')
  } else {
    console.log(`Hmm.. You don't have an age I guess`)
  }
}
checkAge({ age: 18 })

function getAge(...args) {
  console.log(typeof args)
}
getAge(21)

function getAge() {
  'use strict'
  age = 21
  console.log(age)
}
getAge()