构造函数和实例化

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

console.log("geyao")
var teacher={
    name:"geyao",
    age:18,
    sex:"male",
    height:176,
    weight:130,
    teach:function(){
        console.log("wo hui jiaoshu")
    },
    eat:function(){
        console.log("wo hui eat")
    }
}

案例2

var attendance={
    students:[],
    total:6,
    join:function(name){
        this.students.push(name)
        console.log(this.students)
        if(this.students.length===this.total){
            console.log(name+"到课,学生已经全部到齐")
        }else{
            console.log(name+"到课,学生已经未到齐")
        }
    },
    leave:function(name){
        var idx=this.students.indexOf(name)
        if(idx!==-1){
            this.students.splice(idx,1)
        }
        console.log(name+"早退")
        console.log(this.students)
    }
}
attendance.join("歌谣")
attendance.join("方方")
attendance.join("康康")
attendance.leave("轩轩")

运行结果

案列3

function Teacher(){
    this.name="geyao",
    this.age="男"
    this.smoke=function(){
        console.log("wo hui smoking")
    }
}
var teacher1=new Teacher()
var teacher2=new Teacher()
teacher1.name="方方"
console.log(teacher1,teacher2)

运行结果

案例4

function Teacher(opt){
    this.name=opt.name,
    this.sex=opt.sex,
    this.weight=opt.weight,
    this.course=opt.course
    this.smoke=function(){
        this.weight--
        console.log("wo hui smoking")
    },
    this.eat=function(){
        this.weight++
    }
    
}
var teacher1=new Teacher({
    name:"晓晓",
    sex:"男",
    weight:130,
    course:"java"
})
var teacher2=new Teacher({
    name:"晓晓",
    sex:"男",
    weight:130,
    course:"java"
})
console.log(teacher1,teacher2)

运行结果