Lazy function in Vue3: Lazy loading of components improves performance

With the continuous development of front-end technology, web applications are becoming more and more complex, and the number of components is also increasing. At this time, how to improve the loading speed of applications and give users a better experience has become a very important issue. The lazy function in Vue3 can implement lazy loading of components, thereby improving the performance of the application.

Vue3 is a very popular front-end framework with a very efficient component system. However, in applications, we often encounter a problem: some components are not commonly used or need to be loaded under certain circumstances, but when the application starts, all components will be loaded, which will cause the application to The loading speed slows down, affecting the user experience. To solve this problem, Vue3 introduced the lazy function.

The lazy function can delay the loading of the component until the first time the component is used. In this way, the initial loading time of the application can be greatly reduced and the performance of the application can be improved. The use of the lazy function is very simple, just add the lazy function before the import statement of the component.

Illustrate with an example:

// 普通方式引入组件
import NormalComponent from './components/NormalComponent.vue'

// 使用lazy函数引入组件
const LazyComponent = () => import('./components/LazyComponent.vue')

In the above code, NormalComponent is a normal component, and LazyComponent is a component optimized using the lazy function. When the application starts, the NormalComponent will be loaded as the application loads, while the LazyComponent will be loaded lazily and will only be loaded when the component is used. This way, we can make the initial load time of the application faster and users can start using the application faster.

In addition to using the lazy function to lazily load ordinary components, Vue3 also supports using the lazy function to lazily load routing components. Lazy loading of routes can help us reduce initial loading time, save bandwidth, and thereby improve application performance. The following is a sample code that uses routing lazy loading:

const router = createRouter({
  history: createWebHistory(),
  routes: [
    {
      path: '/',
      name: 'Home',
      component: () => import('./views/Home.vue')
    },
    {
      path: '/about',
      name: 'About',
      component: () => import('./views/About.vue')
    }
  ]
})

In the above code, we use the arrow function to lazily load the routing component. This method is similar to the lazy loading method of ordinary components. You only need to use the lazy function to wrap the component.

When using the lazy function to lazy load components, you need to pay attention to the following two points:

1. The lazy function can only act on the import statement of the component. If you use the lazy function inside the component it will have no effect.
2. The component wrapped in the lazy function must be an asynchronously loaded component, so it needs to be wrapped using an arrow function.

In general, using the lazy function can effectively improve the performance of the application, save bandwidth, and thus provide users with a better experience. You need to pay attention to the above two points during use, especially the use of arrow functions. We believe that by using lazy functions, we can better optimize applications and improve the efficiency and quality of front-end development.

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