How is route matching done in Vue Router?

Vue Router is the official routing manager of Vue.js. It can help us switch and jump between pages in single-page applications, making web applications have a better user experience. One of the core functions in Vue Router is route matching. This article will introduce how route matching is performed in Vue Router.

In Vue Router, route matching is completed through the routing table (Route Table). The routing table is defined by the developer, and each routing table item contains the path, the corresponding component, and its related configuration. When creating a Vue Router instance, we can define the routing table by passing a routing configuration object.

import Vue from 'vue'
import VueRouter from 'vue-router'
import Home from './components/Home.vue'
import About from './components/About.vue'
import NotFound from './components/NotFound.vue'

Vue.use(VueRouter)

const routes = [
  { path: '/', component: Home },
  { path: '/about', component: About },
  { path: '*', component: NotFound },
]

const router = new VueRouter({
  routes
})

export default router

Three routing table entries are defined in the above code. { path: '/' } indicates the root path, and the corresponding component is Home; { path: '/about' } indicates the path is / about, the corresponding component is About; { path: '*' } represents other unmatched paths, and the corresponding component is NotFound.

At runtime, when a user accesses a certain path, Vue Router will match the current path and find the corresponding routing table entry. Vue Router provides two matching modes: Hash-based (Hash Mode) and History-based (History Mode).

Hash-based matching mode implements route matching by monitoring changes in location.hash. For example, when a user accesses the /about path, the value of location.hash will change to #/about, and Vue Router will match based on this hash value. Corresponding routing table entry, and load the corresponding components.

History-based matching mode uses HTML5's History API to implement route matching by monitoring changes in location.pathname. For example, when a user accesses the path /about, the value of location.pathname will change to /about, and Vue Router will match the corresponding path name based on this path name. routing table entries and load the corresponding components.

Vue Router internally implements a route matching algorithm. It will split the routing path according to /, and then match them in sequence. For each path segment, Vue Router will determine whether it matches the path segment of the current routing table entry.

Route matching supports dynamic parameters. We can use dynamic parameters in the path of routing table entries. For example, :id in { path: '/user/:id' } is a dynamic parameter. During the actual matching process, when the id part of the path changes, Vue Router will re-match and pass the value of the dynamic parameter to the component.

In addition to path matching, Vue Router also supports other matching conditions, such as redirection (Redirect) and alias (Alias). By configuring these matching conditions, we can control the routing behavior more flexibly.

To summarize, route matching in Vue Router is completed through the routing table. The routing table is defined by the developer, and each routing table entry contains the path and corresponding components and their related configurations. At runtime, Vue Router will match the current path, find the corresponding routing table entry, and load the corresponding component. Route matching supports dynamic parameters, and the behavior of the route can be controlled by configuring other matching conditions.

I hope this article can help readers understand the route matching process in Vue Router and be able to use it flexibly in actual projects.

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