Vue Router Lazy-Loading routing: a trend to help improve page performance

Vue Router is the official routing manager in the Vue.js framework. It allows developers to switch page content through route mapping, making single-page applications more controllable and easier to maintain. However, as applications become more complex, the loading and parsing of routes can become a performance bottleneck. In order to solve this problem, Vue Router provides a function of lazy loading of routes, which defers the loading of routes until actually needed.

Lazy-loading is a loading technique that delays the loading of resources until they are actually needed. For large single-page applications, lazy loading can greatly improve page loading speed and performance. By splitting larger chunks of code into smaller chunks and loading them on demand when needed, you can avoid loading the entire application at once. Here, we will learn about lazy loading routing in Vue Router and provide some specific code examples.

Lazy loading routing in Vue Router can be implemented through the dynamic import function. Dynamic import is a feature of ES6, which allows us to import different modules as needed during code execution. In Vue Router, we can define the component corresponding to each route as a function, which returns an import() Promise. When this Promise is parsed, the corresponding component will be dynamically loaded.

Let us use a simple example to illustrate the use of lazy loading routing. Let's say we have a page called Home and a page called About. We can define them as lazy loading routes as follows:

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

In the above code, Home and About are both functions, and they use the import() function to dynamically load the corresponding components. Note that component paths are relative to the current module. Now, we can configure these lazy loading routes into Vue Router:

const router = new VueRouter({
  routes: [
    {
      path: '/',
      component: Home
    },
    {
      path: '/about',
      component: About
    }
  ]
});

In the above code, we configure Home and About to the root paths '/' and '/about' respectively. When users access these routes, the corresponding components will be dynamically loaded and rendered.

In addition to basic lazy loading routing, Vue Router also provides a more advanced lazy loading method, namely asynchronous components. An asynchronous component is a special component that does not render immediately when it is first loaded. Instead, it loads and renders the component when it is needed.

Let us take an example to illustrate the usage of asynchronous components. Suppose we have a page called Post whose data needs to be obtained from the server via AJAX. We can define Post as an asynchronous component and load and render it when needed.

const Post = () => ({
  component: import('./components/Post.vue'),
  loading: LoadingComponent,
  error: ErrorComponent,
  delay: 200,
  timeout: 3000
});

In the above code, Post is a function that returns a configuration object containing the configuration required for dynamic loading and rendering of components. Among them, the component attribute represents the component to be loaded, the loading attribute represents the placeholder component displayed before the component is loaded, the error attribute represents the component displayed when loading fails, the delay attribute represents the delayed loading time (milliseconds), and the timeout attribute represents the loading timeout. time (milliseconds).

When configuring Post into Vue Router, we can directly use it as an asynchronous component:

const router = new VueRouter({
  routes: [
    {
      path: '/post/:id',
      component: Post
    }
  ]
});

In the above code, we configure Post to a path with parameters '/post/:id'. When the user accesses the path, the Post component will be dynamically loaded and rendered.

In summary, Vue Router's lazy loading of routes can postpone the loading of routes until actually needed. By splitting larger blocks of code into smaller chunks and loading them on demand when needed, you can greatly improve the performance and loading speed of your pages. In this article, we learned about the basic usage of lazy routing in Vue Router and provided some concrete code examples. I hope this article can help you understand and use lazy loading routing!

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