关于原型

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原型的讲解

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"
  }
}

声明方式

 const obj={}
 
 
 
 
function Obj1(){}
 
 
 
 
const obj1=new Obj1()
 
 
 
 
const obj2=Object.create(null)
 
 
 
 
const obj3=new Object()
 
 
 
 
console.log(obj,obj1,obj2,obj3)

运行结果

原型案例

 function Test(){
    this.a=1;
    this.b=2;
}
Test.prototype.c=3
Test.prototype.d=4
Object.prototype.e=5
Object.prototype.f=6
const test=new Test()
console.log(test)

运行结果

原型案例

 function test(){}
console.dir(test.__proto__===Function.prototype)
console.log(Function.__proto__===Function.prototype)
function Test1(){
    this.a=1
}
Test1.prototype.b=2
const test1=new Test1()
//test.__proto__
const testPrototype=Object.getPrototypeOf(test1)
console.log(testPrototype===test1.__proto__)
const obj={
    a:1
}
Object.setPrototypeOf(obj,{
    b:1
})
console.log(obj)

运行结果

对象参数属性

 const obj=Object.create({
    a:1,
    b:2
},{
    a:{
        value:3,
        writable:false,
        configurable:true,
        enumerable:true
    }
})
console.log(obj)

监听状态改变

index.html

 <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <h1>
 
 
 
 
    </h1>
    <h2></h2>
    <p></p>
    <span></span>
    <script type="module" src="./index5.js"></script>
</body>
</html>

index5.js

 import { useReacttive, useWatcher } from "./Delfin.js"
const state = useReacttive({
    title: `This is title`,
    content: `This is content`
})
function render() {
    document.querySelector("h1").innerText = state.title
    document.querySelector("h2").innerText = state.title
    document.querySelector("p").innerText = state.content
    document.querySelector("span").innerText = state.content
}
render()
useWatcher([
    document.querySelector('h1'), document.querySelector('h2')
],'title',(prev,cur)=>{
    console.log(prev,cur)
})
useWatcher([
    document.querySelector('p'), document.querySelector('span')
],'content',(prev,cur)=>{
    console.log(prev,cur)
})
setTimeout(()=>{
    state.title="这是标题",
    state.content="这是内容"
},1000)

delfin.js

 import WatcherMap from "./WacthMap"
import Watcher from './Watcher'
 
 
 
 
const watcherMap=new WatcherMap()
export function useReacttive(state){
   return new Proxy(state,{
    get(target,key){
        return Reflect.get(target,key)
    },
    set(target,key,value){
        watcherMap[key].update(target[key],value)
        return Reflect.set(target,key,value)
    }
   })
}
 
 
 
 
export function useWatcher(collection,dep,callback){
   const watcher=new Watcher()
   watcher.set(collection,callback)
   watcherMap.set(dep,watcher)
}

WatchMap.js

 export default function WactherMap(){
 
 
 
 
}
 
 
 
 
WactherMap.prototype.set=function(dep,watcher){
    this[dep]=watcher;
}

Wacther.js

 export default function Watcher(){
   this.collection=[];
   this.cb=null
}
Watcher.prototype.set=function(collection,callback){
   this.collection=collection
   this.cb=callback
}
Watcher.prototype.update=function(prevValue,currentValue){
  this.collection.forEach(el=>{
    el.innerText=currentValue
  })
  this.cb[prevValue,currentValue]
}

运行结果

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posted @ 2023-09-22 14:49 前端导师歌谣阅读(7) 评论(0) 编辑收藏举报来源

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推荐排行榜

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

	const obj={}




	function Obj1(){}




	const obj1=new Obj1()




	const obj2=Object.create(null)




	const obj3=new Object()




	console.log(obj,obj1,obj2,obj3)

	function Test(){
	this.a=1;
	this.b=2;
	}
	Test.prototype.c=3
	Test.prototype.d=4
	Object.prototype.e=5
	Object.prototype.f=6
	const test=new Test()
	console.log(test)

	function test(){}
	console.dir(test.__proto__===Function.prototype)
	console.log(Function.__proto__===Function.prototype)
	function Test1(){
	this.a=1
	}
	Test1.prototype.b=2
	const test1=new Test1()
	//test.__proto__
	const testPrototype=Object.getPrototypeOf(test1)
	console.log(testPrototype===test1.__proto__)
	const obj={
	a:1
	}
	Object.setPrototypeOf(obj,{
	b:1
	})
	console.log(obj)

	const obj=Object.create({
	a:1,
	b:2
	},{
	a:{
	value:3,
	writable:false,
	configurable:true,
	enumerable:true
	}
	})
	console.log(obj)

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Document</title>
	</head>
	<body>
	<h1>




	</h1>
	<h2></h2>
	<p></p>
	<span></span>
	<script type="module" src="./index5.js"></script>
	</body>
	</html>

	import { useReacttive, useWatcher } from "./Delfin.js"
	const state = useReacttive({
	title: `This is title`,
	content: `This is content`
	})
	function render() {
	document.querySelector("h1").innerText = state.title
	document.querySelector("h2").innerText = state.title
	document.querySelector("p").innerText = state.content
	document.querySelector("span").innerText = state.content
	}
	render()
	useWatcher([
	document.querySelector('h1'), document.querySelector('h2')
	],'title',(prev,cur)=>{
	console.log(prev,cur)
	})
	useWatcher([
	document.querySelector('p'), document.querySelector('span')
	],'content',(prev,cur)=>{
	console.log(prev,cur)
	})
	setTimeout(()=>{
	state.title="这是标题",
	state.content="这是内容"
	},1000)

	import WatcherMap from "./WacthMap"
	import Watcher from './Watcher'




	const watcherMap=new WatcherMap()
	export function useReacttive(state){
	return new Proxy(state,{
	get(target,key){
	return Reflect.get(target,key)
	},
	set(target,key,value){
	watcherMap[key].update(target[key],value)
	return Reflect.set(target,key,value)
	}
	})
	}




	export function useWatcher(collection,dep,callback){
	const watcher=new Watcher()
	watcher.set(collection,callback)
	watcherMap.set(dep,watcher)
	}

	export default function WactherMap(){




	}




	WactherMap.prototype.set=function(dep,watcher){
	this[dep]=watcher;
	}

	export default function Watcher(){
	this.collection=[];
	this.cb=null
	}
	Watcher.prototype.set=function(collection,callback){
	this.collection=collection
	this.cb=callback
	}
	Watcher.prototype.update=function(prevValue,currentValue){
	this.collection.forEach(el=>{
	el.innerText=currentValue
	})
	this.cb[prevValue,currentValue]
	}

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微信公众号关注前端小歌谣 每日分享前端知识

关于原型

公告

搜索

常用链接

最新随笔

我的标签

积分与排名

随笔分类

随笔档案

相册

阅读排行榜

推荐排行榜

微信公众号关注前端小歌谣每日分享前端知识