How to use VueRouter4.x? Quick start guide

How to use VueRouter4.x? The following article will share with you a quick tutorial and introduce how to quickly get started with VueRouter4.x in 10 minutes. I hope it will be helpful to everyone!

Vue Router is a routing plug-in developed by the Vue team that is deeply integrated with the core of Vue.js, making it very simple to build single-page programs with Vue; The latest version of Vue Router is 4.X, which is also the recommended version for Vue3. In this article, we will learn about Vue Router 4.X. (Learning video sharing: vue video tutorial)

URL.hash and History

There are two types of history## in Vue Router # (Record historical routing), respectively URL.hash and History provided in HTML5.

Hash history is useful for web applications without hosts (such as

file://), or when the configuration server cannot handle arbitrary URLs, but hashing is very poor for SEO;

History History is new in HTML5 and is not very friendly to IE, but Vue3 has given up on IE, so you don’t have to consider IE; this method is currently the most common method. But the application must be served over the http protocol.

Installation and usage process

First we install Vue Router, the command is as follows:

npm i vue-router

Then in

main.js Write the following code:

import { createApp } from 'vue'
import App from './App.vue'
// 1 引入 createRouter
import { createRouter, createWebHistory } from 'vue-router'
// 2 定义路由映射表
const routes = [
  /* more router */
]
// 3 创建路由实例，并传递对应配置
const router = createRouter({
  // history 模式 这里使用createWebHistory
  history: createWebHistory(),
  // 传递路由映射表
  routes
})
createApp(App).use(router).mount('#app')

If there are too many

routes in the above code, you can define a router.js file and extract it, sample code As follows:

router.js

export default [
  /* more router */
]

main.js

import { createApp } from 'vue'
import App from './App.vue'
// 2 引入路由映射表
import routes from './router'

// 1 引入 createRouter
import { createRouter, createWebHistory } from 'vue-router'
// 3 创建路由实例，并传递对应配置
const router = createRouter({
  // history 模式 这里使用createWebHistory
  history: createWebHistory(),
  // 传递路由映射表
  routes
})
createApp(App).use(router).mount('#app')

or **directly in ****# Directly export a routing instance in ##router.js

and use it in main.js**（ This method is more commonly used).

router-link and router-view

router-link

##

is a custom component provided by Vue, used to create links. The native

is not used in Vue, because will be reset after changing the URL. Loading the page but will not; for details about which properties the component supports, please refer to the documentation. router-view

## component is used for the component corresponding to the URL, such as the following code:

<template>
  <router-link to="/hello"
    ><img alt="Vue logo" src="./assets/logo.png"
  /></router-link>
  <router-view></router-view>
</template>

Then our router.js code is as follows:

import RootComponent from './components/root.vue'
export default [
  {
    path: '/',
    // 引入组件
    component: RootComponent
  },
  {
    path: '/hello',
    // 路由懒加载引入组件
    component: () => import('./components/HelloWorld.vue')
  }
]

For other configuration items, you can refer to the documentation.

The code running results are as follows:

Routing lazy loading

When our application becomes more and more When the JavaScript code is large, the packaged JavaScript code will also be particularly large. At this time, we need to split the entire application into different blocks, and Vue Router supports this function. We only need toreplace the static import with dynamic import. , such as the above code:

component: () => import('./components/HelloWorld.vue')

Then the packaging (webpack, Vite) tool will package these dynamically imported components separately, as shown in the following figure:

Dynamic routing

VueRouter allows us to dynamically set routing matching rules. For example, we now have a User component, and the content of the component will Different content is displayed according to different IDs. The setting method only needs to be set in the form of

:parameter name

. For example: <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:js;toolbar:false;">{ path: &amp;#39;/user/:id&amp;#39;, component: () =&gt; import(&amp;#39;@/components/User&amp;#39;) }</pre><div class="contentsignin">Copy after login</div></div> Jump in the template as follows:

<router-link to="/user/10010"></router-link>

Or use the

push

method provided by

useRouter

For example: <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:js;toolbar:false;">import { useRouter } from &amp;#39;vue-router&amp;#39; const {push} = useRouter() push({ path: &amp;#39;/user&amp;#39;, params: { id: 10010 } }) // 或者 let id = 10010 push(&amp;#39;/user/&amp;#39; + id)</pre><div class="contentsignin">Copy after login</div></div> You can obtain the routing address through the useRoute hook. The usage is consistent with

useRouter

. Match all routes

VueRouter’s dynamic routing allows us to match routes that are not matched. The sample code is as follows:

{
  path: '/:pathMatch(.*)',
  component: () => import('./components/Page404.vue'),
},

The current route If the match is unsuccessful, this route will be matched.

Routing nesting

Now we have a requirement, which is to store two components under the HelloWorld component and need to switch between the two components.

这个时候路由嵌套的就发挥作用了，其实路由嵌套比较简单，就是通过路由配置中的一个children属性来实现，示例代码如下：

HelloWorld.vue

<template>
  <h1>Hello World</h1>
  <div
    style="
      display: flex;
      justify-content: space-between;
      width: 240px;
      margin: 0 auto;
    "
  >
    <router-link to="about">about</router-link>
    <router-link to="user">user</router-link>
  </div>
  <router-view></router-view>
</template>

router.js

{
  path: '/hello',
  // 路由懒加载引入组件
  component: () => import('./components/HelloWorld.vue'),
  children: [
    {
      path: 'about',
      component: () => import('./components/about.vue'),
    },
    {
      path: 'user',
      component: () => import('./components/user.vue'),
    },
  ],
},

子组件比较简单，只有一个<h1></h1>标签，最终效果如下：

写在最后

这篇文章到这就结束了，总的来说比较简单没有什么太深入的东西，比较适合入门。

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