构造函数和实例化原理

前言

我是歌谣最好的种树是十年前其次是现在今天继续给大家带来的是构造函数和实例化原理的讲解

环境配置

npm init -y
yarn add vite -D

修改page.json配置端口

{
  "name": "demo1",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "dev": "vite --port 3002"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "vite": "^4.4.9"
  }
}

案例1

function Car(color,brand){
    this.color=color,
    this.brand=brand
    this.drive=function(){
        console.log("i am running")
    }
}
var car = new Car('黑色',"geyao")
console.log(car.color)
console.log(car.brand)
car.drive()

运行结果

案例2

function Car(color,brand){
    var me={};
    me.color=color;
    me.brand=brand
    return me
}
var car=new Car("red","geyao")
console.log(car.color)
console.log(car.brand)

运行结果