Lazy loading of routes in Vue

As web applications continue to increase in complexity, the use of front-end frameworks and libraries is becoming more widespread. Vue is a popular JavaScript framework for building reusable and easy-to-maintain user interfaces. Vue includes many features, and it continues to grow with each version.

In Vue, routing is a common feature that allows you to navigate to different pages in a single page application (SPA). As applications become more complex, routing functionality requires further optimization, especially in terms of page load times. This is the background of lazy loading of routes in Vue.

Routing lazy loading, as the name suggests, refers to delayed loading of routing components. When using traditional routing, all components are loaded once when the application starts. This means that the component always exists in memory even if the user does not access it, which can lead to longer application load times, especially for large applications. Routing lazy loading will load the component when the user accesses the page, which will significantly reduce the loading time of the application and improve the user experience.

Vue has a built-in routing lazy loading function, which is implemented through Webpack's code splitting function, and components can be easily divided into different blocks. Using routing lazy loading requires installing and configuring Webpack and Babel plug-ins. In addition, we also need to use the dynamic import syntax in Vue to load components asynchronously.

Dynamic import syntax can convert the import of our component into a function that returns a Promise object. When the component is accessed, this function starts executing and automatically loads the component. The following is an example of dynamic import syntax:

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

In the above example, we use arrow functions to import the component. In routing, we use these functions to define the components associated with the route. For example:

const routes = [
  {
    path: '/',
    name: 'Home',
    component: () => import('./views/Home.vue')
  }
]

This way, when we access the "/" path, the component will be automatically loaded when needed.

In addition to using arrow functions for component loading, you can also use the dynamically imported global API Vue.component() and Vue.mixin(). These APIs can define common behavior for handling lazy-loaded components globally.

In short, lazy loading of routes is a very useful feature in Vue. It can greatly optimize application performance, especially for large applications and mobile applications. When using routing, we should use routing lazy loading as much as possible to improve user experience.

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