[Vue, Ali P8 teaches you personally

Programmer Soto 2021-08-08 20:16:33
vue ali p8 teaches personally

 ![ Insert picture description here ](https://s2.51cto.com/images/20210808/1628424256690507.jpg)

The core of front-end routing : change URL, But the page does not refresh as a whole

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)URL Of hash

URL Of hash That is to say Anchor point (#), It's essentially a change window.location.href attribute

  • We can do this by assigning values directly location.hash To change href, But the page doesn't refresh

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)HTML5 Of history Pattern (5 Kind of )

history Interface is HTML5 Newly added , It has five pattern changes URL Without refreshing the page

  • history.pushState()

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  • history.replaceState()

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  • history.go()

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Add :

  • history.back() Equivalent to history.go(-1)

  • history.forward() Equivalent to history.go(1)

  • These interfaces are equivalent to the forward and backward of the browser interface



At present, there are three popular frameworks in the front end , Each has its own routing implementation :

  • Angular Of ngRouter
  • React Of ReactRouter
  • Vue Of vue-router

vue-router yes Vue.js The official routing plug-in , It and Vue.js It's deeply integrated , Suitable for building single page applications

vue-router Official website : https://router.vuejs.org/zh/

vue-router It's based on Routing and components

  • Routing is used to set the access path , Mapping paths and components

  • stay vue-router In a single page application , The change of page path is the switch of components .

Installation and use vue-router

We have learned webpack, In the follow-up development, we mainly develop in an engineering way

install vue-router

npm install vue-router --save

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Use it in modular Engineering ( Because it's a plug-in , So you can go through Vue.use() To install the routing function )

  • Import routing objects , And call Vue.use(VueRouter)

  • Create a routing instance , And incoming route mapping configuration

  • stay Vue The created routing instance is mounted in the instance

Use vue-router Steps for :

  • Create routing component

  • Configure route mapping : Component and path mapping relationships

  • Using routing : adopt <router-link> and <router-view>

Routing configuration generally does not need to be configured by yourself , It's all equipped in the scaffold , Focus on the use of routing .

  • <router-link>: The label is a vue-router Built in components in , It will be rendered as a <a> label

  • <router-view>: The tag will be based on the current path , Dynamic rendering of different components

  • The rest of the page , Like the title at the top / Navigation , Or some copyright information at the bottom will be related to <router-view> At the same level

  • When routing is switched , The switch is <router-view> Mounted components , Nothing else will change

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Routing effect :

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) The default path for routing

By default , Go to the home page of the website , We hope <router-view> Rendering the content of the home page

  • How to make the path jump to the home page by default , also <router-view> Rendering the home page component ?

  • Configure pair in routing configuration '/' The mapping of paths ,redirect Is redirection

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)HTML5 Of History Pattern

As we said earlier, there are two ways to change the path :

  • URL Of hash

  • HTML5 Of history

  • By default , The change of path uses URL Of hash

Can be configured to use HTML5 Of History Pattern , Reference resources Official documents

Road load by lazy

Official explanation : When you package and build an application ,Javascript The bag will get very big , Affects page loading . If we can divide the components corresponding to different routes into different code blocks , Then the corresponding component is loaded when the route is accessed , It's more efficient .

The main function of lazy route loading is : Package the components corresponding to the route into one by one js Code block , Only when this route is accessed , Load the corresponding component .

The effect of routing lazy loading :

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Lazy loading in code :

  • Mode one : combination Vue The asynchronous components and Webpack Code analysis of

const Home = resolve => { require.ensure(['../components/Home.vue'],
() => { resolve(require('../components/Home.vue')) })};

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  • Mode two :AMD How to write it

const About = resolve => require(['../components/About.vue'], resolve);

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  • Mode three : Use ES6 Grammar to organize Vue Asynchronous components and Webpack Code segmentation for

const Home = () => import('../components/Home.vue')

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Nested Route

Nested routing is a very common feature ,

  • For example home On the page , Hope to pass /home/news and /home/message Visit some content

  • A path maps to a component , Accessing these two paths will also render two components separately

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Two steps to implement nested routing :

  • Create the corresponding sub component , And configure the corresponding sub route in the routing map

  • Use... Inside the component <router-view> label

Nested routing examples :

  1. Define two components

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  2. Use router-link and router-view Show subcomponents

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  3. Configure the routing

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  4. Show the effect

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) Default path for nested routes

Nested routes can also be configured with default paths , The configuration is as follows :

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Routing parameters

There are two main types of passing parameters :params and query

params The type of

  • Configure routing format :/router/:id

  • The way of transmission : stay path Follow the corresponding value

  • The path formed after transmission :/router/123,/router/abc

query The type of

  • Configure routing format :/router, It's a normal configuration

  • The way of transmission : Use in object query Of key As a means of delivery

  • The path formed after transmission :/router?id=123,/router?id=abc

Two ways of use :

  • <router-link>

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  • JavaScript Code mode

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$route To obtain parameters

Get parameters by $route Object acquired

In the use of the vue-router The application of , Routing objects are injected into each component , The assignment is this.$route, And when the route switches , The routing object is updated .

adopt $route The information to be transmitted is as follows :

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$route and $router The difference between :

  • $router by VueRouter example , Want to navigate to different URL, Use $router.push Method
  • $route by At present router Jump object , You can get name、path、query、params etc.

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