What does lazy loading of vue routing mean?

Lazy loading of vue routing means loading the code of a routing component only when the component needs to be used, in order to reduce the initial loading time and improve application performance. The implementation principle is to dynamically load the code of a routing component when the component needs to be used. Specifically, when the user navigates to a route, Vue Router will check whether the component of the route has been loaded. If not, it will use Webpack's dynamic import function to asynchronously load the code of the component. When using lazy loading, you must ensure that the name of the asynchronous component is unique.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

Vue Router lazy loading (Vue Router lazy loading) refers to loading the code of a routing component only when the component needs to be used, in order to reduce the initial loading time and improve application performance. In a Vue.js application, if the routing configuration and components are included in the application's packaging file, it will cause the initial load time to increase, especially when the application has many routes and components. To solve this problem, Vue.js provides a routing lazy loading mechanism.

The implementation principle of lazy loading of Vue routing is to dynamically load the code of a routing component when you need to use it. Specifically, when the user navigates to a route, Vue Router will check whether the component of the route has been loaded. If not, it will use Webpack's dynamic import function to asynchronously load the code of the component. This way, the corresponding component code is loaded only when the user actually needs to access the route, reducing initial load time.

To implement lazy loading of Vue routing, you need to use the asynchronous component function of Vue Router. An asynchronous component is a factory function that returns a Promise object that should resolve a component. In Vue Router, asynchronous components can be specified by using the component attribute in the route configuration. For example:

const routes = [{path: '/user',component: () => import(/* webpackChunkName: "user" */ './UserComponent.vue')}]

In this example, when the user navigates to the /user route, Vue Router asynchronously loads the UserComponent.vue component. Webpack will package the component into an independent code chunk (chunk), and use webpackChunkName in the comment to specify the name of the code chunk. This way, when the component needs to be loaded, Webpack can quickly find and load the corresponding code block.

In addition to using the dynamic import function of Webpack to implement lazy loading of routes, you can also use the navigation guard function of Vue Router to achieve this. Navigation guards are code segments that are executed before and after navigation is triggered. Components can be dynamically loaded in navigation guards as needed. For example:

router.beforeEach((to, from, next) => {const isIE = navigator.userAgent.indexOf('MSIE') !== -1;if (isIE) {// 如果使用ie浏览器，则不进行懒加载  next(false);} else {// 否则进行懒加载  next();}})

In this example, the beforeEach navigation guard function of Vue Router is used. This function is executed before the navigation is triggered, and components can be loaded dynamically as needed. For example, here it is determined whether the user is using IE browser. If so, lazy loading will not be performed; otherwise, lazy loading will be performed. It should be noted that when using navigation guards, the next function must be used to end the callback function. If the next function is not called, the navigation will be canceled.

In short, Vue routing lazy loading is a very useful performance optimization technique, which can reduce the initial loading time of the application to a minimum and improve the performance and response speed of the application. When implementing lazy loading of Vue routes, you can use the dynamic import function of Webpack or the navigation guard function of Vue Router. It should be noted that when using lazy loading, you must ensure that the name of the asynchronous component is unique to avoid problems.

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