The unique advantages of Vue Router Lazy-Loading routing, how to optimize page performance?

Vue Router is a route management plug-in officially provided by Vue.js. It can help us implement page navigation and route switching in Vue applications. The Lazy-Loading feature is a unique advantage of Vue Router, which can greatly optimize page performance. In this article, we’ll introduce Vue Router’s Lazy-Loading routing feature and provide some practical code examples for optimizing page performance.

Lazy-Loading means loading a module or component only when needed, rather than loading all resources when the application is initially loaded. This means that when a user first visits the website, only the necessary resources are loaded without having to wait for all components to load. Lazy-Loading routing is especially useful for large applications and SPAs (Single Page Applications) as it can significantly reduce initial load time.

In Vue Router, implementing Lazy-Loading routing is very simple. We only need to use the import() function when defining routes to dynamically import the corresponding components. For example, assuming we have a component named Home, we can use the following method for Lazy-Loading:

const Home = () => import('./components/Home.vue');

In the above code, the Home component only It is only loaded when the route is accessed. This means that the code for the Home component will only be loaded when the user visits the /home page. For other pages, we can use the same method for Lazy-Loading.

One of the benefits of using Lazy-Loading routing is the significant reduction in page initial load time. Since only the components required for the current route will be loaded, the initial load time will be greatly reduced. This is important to improve user experience and reduce wait time for first load.

Another advantage is that components can be loaded on demand. This means that as users browse the website, every time they click on a new route link, only the components required for that route will be loaded. This is very beneficial for reducing network requests and reducing resource usage.

In addition to Lazy-Loading routing, we can also further optimize page performance through other methods. Here are some common optimization tips:

1. Use Webpack’s code splitting plugin. Webpack is a commonly used JavaScript packaging tool that can divide our code into multiple chunks so that only the code required for the current route is loaded. This reduces initial load time and allows additional code blocks to be loaded on demand when needed.

// webpack.config.js
module.exports = {
  // ...
  optimization: {
    splitChunks: {
      chunks: 'all',
    },
  },
};

2. Lazy loading of third-party libraries. For some larger third-party libraries, we can consider lazy loading them to reduce the initial loading time. It can be loaded on demand using the import() function.

// 组件中
import(/* webpackChunkName: "lodash" */ 'lodash').then((_) => {
  // 使用lodash库
  _.chunk(array, [size=1]);
});

3. Pictures are lazy loaded. For a large number of image resources, you can use image lazy loading technology to only load images when they enter the visible area. This can significantly reduce initial load time and the amount of network requests.

//使用vue-lazyload
import VueLazyload from 'vue-lazyload';
Vue.use(VueLazyload, {
  preLoad: 1.3,
  error: 'dist/error.png',
  loading: 'dist/loading.gif',
  attempt: 1,
});

In short, Vue Router's Lazy-Loading routing is an effective way to optimize the page performance of Vue applications. It can drastically reduce initial load time and load components and resources on demand. At the same time, we can also use other optimization techniques such as code splitting and lazy loading of third-party libraries to further optimize performance. By rationally using these optimization techniques, we can provide a better user experience and reduce page loading time and resource usage.

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