How does the lazy loading of vue routes work

Vue routing lazy loading is an optimization technique designed to reduce the initial loading time of an application and improve performance. Specifically, it allows us to load the corresponding component code when the user actually needs to access a certain route, rather than loading all components at once when the application starts.

Let's give an example to illustrate how lazy loading of Vue routes works:

Suppose we have a Vue application with two page components: Home and About. Usually, we will directly reference these components in the routing configuration, such as:

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

However, if the two components have a large amount of code, loading them at the start of the application may result in a longer loading time. To optimize this we can use lazy loading techniques.

In Vue, we can use Webpack's dynamic import function to achieve lazy loading of routing. The modified routing configuration may look like this:

const router = new VueRouter({
  routes: [
    { path: '/', component: () => import('./views/') },
    { path: '/about', component: () => import('./views/') }
  ]
});

In this example, instead of directly referring to the Home and About components, we use arrow functions and import() syntax to load them dynamically. When the user accesses the root path/, Vue Router checks whether the Home component has been loaded. If not, it uses Webpack to load the file asynchronously and creates a new component instance. Similarly, when the user accesses the /about path, the About component is also loaded asynchronously.

In this way, we implement lazy loading of routing components, i.e. loading them only when needed. This helps reduce the initial loading time of the application and improves the user experience.

It should be noted that lazy loading technology is not limited to Vue and Webpack, and other front-end frameworks and build tools also provide similar features. But the integration of Vue and Webpack makes it relatively simple and direct to implementing lazy routing loading in Vue applications.

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