How to use Vue to implement asynchronous loading and on-demand loading of components?

In the development of Vue, in order to improve the performance of the application and reduce the size of the application, we often use asynchronous loading and on-demand loading of components. Asynchronous loading of components allows the application to load component code only when needed, instead of loading all component codes at once, thus improving loading speed and reducing application size. On-demand loading allows applications to dynamically load components through routing, reducing the application's first loading time and initialization time.

This article will introduce how to use Vue to implement asynchronous loading and on-demand loading of components. We will discuss how to use Vue's asynchronous components and routing lazy loading to achieve these two purposes respectively.

1. Asynchronous components

Vue asynchronous components load component code only when needed. It is a way to achieve asynchronous loading of components. The way to use asynchronous components is as follows:

1. Define asynchronous components

We need to define an asynchronous component first, and in the component declaration, use the resolve and require.ensure functions to load the component code.

Vue.component('async-component', function(resolve) {
  require.ensure(['./AsyncComponent.vue'], function() {
    resolve(require('./AsyncComponent.vue'));
  });
});

In the above example, we defined an asynchronous component AsyncComponent and used require.ensure to load the component code. The resolve function is used to receive the component code and execute it after the component code is loaded. Note that the require function must be returned for the component code to be loaded successfully.

2. Using asynchronous components

We can use asynchronous components directly in Vue templates.

<template>
  <async-component></async-component>
</template>

Wherever you need to use an asynchronous component, just use the component name directly. The component code is loaded and displayed when the component is rendered.

2. Routing lazy loading

Vue routing lazy loading is to dynamically load component code through routing configuration, which is a way to achieve on-demand loading of components. The way to use routing lazy loading is as follows:

1. Define routing lazy loading

We need to define a route first and use the dynamic import method to load the component code.

const Foo = () => import('./Foo.vue');
const Bar = () => import('./Bar.vue');

const routes = [
    { path: '/foo', component: Foo },
    { path: '/bar', component: Bar }
]

In the above example, we defined two components Foo and Bar, and loaded the component code through the dynamic import method.

2. Use routing lazy loading

We can use routing lazy loading directly in the Vue routing configuration.

import Vue from 'vue'
import Router from 'vue-router'

const Foo = () => import('./Foo.vue');
const Bar = () => import('./Bar.vue');

Vue.use(Router)

export default new Router({
  routes: [
    {
      path: '/foo',
      name: 'foo',
      component: Foo
    },
    {
      path: '/bar',
      name: 'bar',
      component: Bar
    }
  ]
})

In routes that require on-demand loading, use the dynamic import method to load component code. When the route is accessed, the component code will be loaded and displayed.

3. Summary

The above is a method to use Vue to implement asynchronous loading and on-demand loading of components. We can use different methods to optimize components according to actual needs, improve application performance and reduce application size.

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