Vue family barrel (implementation of Vue router source code)

9na1lmr9 2020-11-11 11:46:22
vue family barrel implementation vue


vue-router

Vue Router yes Vue.js Officer, ⽅ The routing manager for . It and Vue.js The core of ⼼ Deep integration , Make it easy to build a single page application .

  • Nested routing / View table
  • Modular 、 Component based routing configuration
  • Routing parameters 、 Inquire about 、 wildcard
  • be based on Vue.js Transition system view transition effect
  • Fine grained navigation control
  • With automatic activation CSS class Link to
  • HTML5 Historical patterns or hash Pattern , stay IE9 Auto downgrade in
  • Custom scrollbar behavior

install : vue add router

nucleus ⼼ step :

step ⼀: send ⽤vue-router plug-in unit ,router.js

import Router from 'vue-router'
Vue.use(Router)

Step two : Declare a routing table ( Is a mapping table ,path And component is a mapping relationship )

const routes = [
{

path: '/',
name: 'Home',
component: Home
},
{

path: '/about',
name: 'About',
component: () => import(/* webpackChunkName: "about" */ '../views/About.vue')
}
]

Step three : establish Router example ,router.js( Then export )

const router = new VueRouter({

mode: 'history',
base: process.env.BASE_URL,
routes
})

Step four : Add the instance to the root component ,main.js

import router from './router'
new Vue({

router,
}).$mount("#app")

Step five : Add routing view ,App.vue

<router-view></router-view>

Navigation links

<router-link to="/">Home</router-link>
<router-link to="/about">About</router-link>

The above is probably vue-router Basic use of , The following into the simple version of the source code implementation part

vue-router The source code to achieve

Demand analysis

  • spa Page cannot be refreshed
    • hash The way for example : #/home
    • perhaps History api for example : /about
  • according to url Show the corresponding content
    • router-view
    • Data responsive : current Variable holding url Address , Once changed , Dynamically re execute render

Mission

  • Implement a plug-in ( establish VueRouter Classes and install⽅ Law )
    • Realization VueRouter class
      • Handling routing options
      • monitor url The change of
      • Change accordingly
    • Achieve one install Method
      • $router Registration of
      • Two global components

establish kvue-router.js

let Vue; // lead ⽤ Constructors ,VueRouter In order to make ⽤
// Save options 
class VueRouter {

constructor(options) {

this.$options = options;
}
}
// plug-in unit : Realization install⽅ Law , register $router
VueRouter.install = function(_Vue) {

// lead ⽤ Constructors ,VueRouter In order to make ⽤
Vue = _Vue;
// Mission 1: mount $router
Vue.mixin({

beforeCreate() {

// Only the root component has router Options 
if (this.$options.router) {

// vm.$router
Vue.prototype.$router = this.$options.router;
}
}
});
// Mission 2: Implement two global components router-link and router-view
Vue.component('router-link', Link)
Vue.component('router-view', View)
};
export default VueRouter;

Why ⽤ mixed ⼊⽅ Write in style ? The main reason is use Code before ,Router The instance is created after ,⽽install Logic ⼜ need ⽤ To this instance , Here's a clever way ( Mainly to delay execution )

establish router-view and router-link

establish krouter-link.js

 export default {

// Define the parameters passed in 
props: {

to: {

type: String,
require: true
}
},
render(h) {

// <router-link to="/home"/>
// <a href="#/home">XXX</a>
// Better versatility 
return h('a',{

attrs: {

href: '#' + this.to
}
}, this.$slots.default)
// Need current environment support jsx
// return <a href={'#' + this.to}> {this.$slots.default}</a>
}
}

establish krouter-view.js

export default {

render(h) {

// Don't render anything for now 
return h(null);
}
}

monitor url change
Defining responsive current attribute , monitor hashchange event

class VueRouter {

constructor(options) {

// current It should be responsive 
Vue.util.defineReactive(this, 'current', '/')
// Define the properties of a response current
const initial = window.location.hash.slice(1) || '/'
Vue.util.defineReactive(this, 'current', initial)
// monitor hashchange event 
window.addEventListener('hashchange', this.onHashChange.bind(this))
window.addEventListener('load', this.onHashChange.bind(this))
}
onHashChange() {

this.current = window.location.hash.slice(1)
}
}

Get the corresponding component dynamically ,krouter-view.js

export default {

render(h) {

// Get the corresponding component dynamically 
let component = null;
this.$router.$options.routes.forEach(route => {

if (route.path === this.$router.current) {

component = route.component
}
});
return h(component);
}
}

Process routing table ahead of time
Process the routing table ahead of time to avoid loops every time

class VueRouter {

constructor(options) {

// cache path and route The mapping relationship 
this.routeMap = {
}
this.$options.routes.forEach(route => {

this.routeMap[route.path] = route
});
}
}

send ⽤,krouter-view.js

export default {

render(h) {

const {
routeMap, current} = this.$router
const component = routeMap[current] ? routeMap[current].component : null;
return h(component);
}
}

The complete code is attached below

// Implement a plug-in 
// 1. Returns a function 
// 2. Or return an object , It has one install Method 
let _Vue = null
/**
* @class VueRouter
* @param options Options
*/
class VueRouter {

constructor(options) {

// options configuration option : router - Routing table 
this.$options = options
// cache path and route The mapping relation of 
this.routeMap = {
}
// Find the current url For components of 
this.$options.routes.forEach(route => {

this.routeMap[route.path] = route
})
// Need to define a responsive current attribute 
const initial = window.location.hash.slice(1) || '/'
// defineReactive Define responsive data for an object 
_Vue.util.defineReactive(this, 'current', initial)
// monitor url The change of 
window.addEventListener('hashchange', this.onHashChange.bind(this))
}
onHashChange () {

this.current = window.location.hash.slice(1)
console.log(this.current)
}
}
VueRouter.install = function(Vue) {

// quote Vue Constructors , Above VueRouter Use in 
_Vue= Vue
// 1. mount $router
// Use to mix in , Delay the 
Vue.mixin({

// Here this refer to vue The root instance 
beforeCreate() {

if(this.$options.router) {

Vue.prototype.$router = this.$options.router
}
}
})
// 2. Define two global components router-link, router-view
Vue.component('router-link', {

// Define the parameters passed in 
props: {

to: {

type: String,
require: true
}
},
render(h) {

// <router-link to="/home"/>
// <a href="#/home">XXX</a>
// Better versatility 
return h('a',{

attrs: {

href: '#' + this.to
}
}, this.$slots.default)
// Need current environment support jsx
// return <a href={'#' + this.to}> {this.$slots.default}</a>
}
})
Vue.component('router-view', {

render(h) {

// Find the current url Corresponding components 
const {
 routeMap, current } = this.$router
const component = routeMap[current] ? routeMap[current].component : null
return h(component)
}
})
}
export default VueRouter
版权声明
本文为[9na1lmr9]所创,转载请带上原文链接,感谢

  1. [front end -- JavaScript] knowledge point (IV) -- memory leakage in the project (I)
  2. This mechanism in JS
  3. Vue 3.0 source code learning 1 --- rendering process of components
  4. Learning the realization of canvas and simple drawing
  5. gin里获取http请求过来的参数
  6. vue3的新特性
  7. Get the parameters from HTTP request in gin
  8. New features of vue3
  9. vue-cli 引入腾讯地图(最新 api,rocketmq原理面试
  10. Vue 学习笔记(3,免费Java高级工程师学习资源
  11. Vue 学习笔记(2,Java编程视频教程
  12. Vue cli introduces Tencent maps (the latest API, rocketmq)
  13. Vue learning notes (3, free Java senior engineer learning resources)
  14. Vue learning notes (2, Java programming video tutorial)
  15. 【Vue】—props属性
  16. 【Vue】—创建组件
  17. [Vue] - props attribute
  18. [Vue] - create component
  19. 浅谈vue响应式原理及发布订阅模式和观察者模式
  20. On Vue responsive principle, publish subscribe mode and observer mode
  21. 浅谈vue响应式原理及发布订阅模式和观察者模式
  22. On Vue responsive principle, publish subscribe mode and observer mode
  23. Xiaobai can understand it. It only takes 4 steps to solve the problem of Vue keep alive cache component
  24. Publish, subscribe and observer of design patterns
  25. Summary of common content added in ES6 + (II)
  26. No.8 Vue element admin learning (III) vuex learning and login method analysis
  27. Write a mini webpack project construction tool
  28. Shopping cart (front-end static page preparation)
  29. Introduction to the fluent platform
  30. Webpack5 cache
  31. The difference between drop-down box select option and datalist
  32. CSS review (III)
  33. Node.js学习笔记【七】
  34. Node.js learning notes [VII]
  35. Vue Router根据后台数据加载不同的组件(思考-&gt;实现-&gt;不止于实现)
  36. Vue router loads different components according to background data (thinking - & gt; Implementation - & gt; (more than implementation)
  37. 【JQuery框架,Java编程教程视频下载
  38. [jQuery framework, Java programming tutorial video download
  39. Vue Router根据后台数据加载不同的组件(思考-&gt;实现-&gt;不止于实现)
  40. Vue router loads different components according to background data (thinking - & gt; Implementation - & gt; (more than implementation)
  41. 【Vue,阿里P8大佬亲自教你
  42. 【Vue基础知识总结 5,字节跳动算法工程师面试经验
  43. [Vue, Ali P8 teaches you personally
  44. [Vue basic knowledge summary 5. Interview experience of byte beating Algorithm Engineer
  45. 【问题记录】- 谷歌浏览器 Html生成PDF
  46. [problem record] - PDF generated by Google browser HTML
  47. 【问题记录】- 谷歌浏览器 Html生成PDF
  48. [problem record] - PDF generated by Google browser HTML
  49. 【JavaScript】查漏补缺 —数组中reduce()方法
  50. [JavaScript] leak checking and defect filling - reduce() method in array
  51. 【重识 HTML (3),350道Java面试真题分享
  52. 【重识 HTML (2),Java并发编程必会的多线程你竟然还不会
  53. 【重识 HTML (1),二本Java小菜鸟4面字节跳动被秒成渣渣
  54. [re recognize HTML (3) and share 350 real Java interview questions
  55. [re recognize HTML (2). Multithreading is a must for Java Concurrent Programming. How dare you not
  56. [re recognize HTML (1), two Java rookies' 4-sided bytes beat and become slag in seconds
  57. 【重识 HTML ,nginx面试题阿里
  58. 【重识 HTML (4),ELK原来这么简单
  59. [re recognize HTML, nginx interview questions]
  60. [re recognize HTML (4). Elk is so simple