How to optimize the performance of vue and Element-plus and improve web page loading speed

How to optimize the performance of Vue and Element Plus and improve web page loading speed

In modern web applications, performance is a very important consideration. When we build applications using Vue.js and Element Plus, we need to ensure that web pages load quickly to provide users with a good experience. This article will introduce some methods to optimize the performance of Vue and Element Plus, and provide corresponding code examples.

1. Build using production environment

Before deploying your web application, make sure to use Vue's production environment build. The production environment build will remove the debugging code during the development phase and compress the code to reduce the file size. Use the following command to build:

npm run build

2. Introduce Vue and Element Plus using CDN

Introduce Vue and Element Plus from the CDN instead of directly in the application. CDNs (Content Delivery Networks) can provide high download speeds, and users may have loaded the same script on other sites, which can use caching to speed up loading. The following is a CDN link to introduce Vue and Element Plus:

<!-- Vue.js -->
<script src="https://cdn.jsdelivr.net/npm/vue"></script>

<!-- Element Plus -->
<link rel="stylesheet" href="https://unpkg.com/element-plus/lib/theme-chalk/index.css">
<script src="https://unpkg.com/element-plus/lib/index.js"></script>

3. Introduce components on demand

Element Plus has a very rich component library. However, if we don’t need all the components, we can introduce them on demand to reduce the file size of the entire application. Using the [babel-plugin-component](https://github.com/element-plus/babel-plugin-component) plug-in provided by Element Plus, components can be introduced on demand through configuration. The sample code is as follows:

First, install the plug-in:

npm install babel-plugin-component -D

Then, add the following content in the babel.config.js configuration file:

module.exports = {
  presets: [
    '@vue/cli-plugin-babel/preset'
  ],
  plugins: [
    [
      'component',
      {
        libraryName: 'element-plus',
        styleLibrary: {
          name: 'theme-chalk',
          base: false
        },
        // 需要按需引入的组件
        components: [
          'ElButton',
          'ElInput',
          // 其他组件...
        ]
      }
    ]
  ]
}

By introducing components on demand, you can reduce file size and improve web page loading speed.

4. Use keep-alive caching component

In Vue, you can use the <keep-alive> component to cache instances of other components, This avoids re-rendering the component every time, thus improving performance. For example, when we use the Element Plus table component, we can use <keep-alive> to cache the table instance. The sample code is as follows:

<template>
  <keep-alive>
    <el-table
      v-if="showTable"
      :data="tableData">
      <!-- 表格列定义 -->
    </el-table>
  </keep-alive>
</template>

<script>
export default {
  data() {
    return {
      showTable: true,
      tableData: []
    }
  },
  mounted() {
    // 获取表格数据
    this.getTableData()
  },
  methods: {
    getTableData() {
      // 异步获取表格数据
      // ...
      // 获取成功后，将数据赋值给tableData
      this.tableData = data
      // 显示表格
      this.showTable = true
    }
  }
}
</script>

By using the <keep-alive> component, you can avoid re-rendering the table component every time, thereby improving performance.

5. Use routing lazy loading

If the application has multiple pages, using Vue's routing lazy loading can load page components on demand to improve the initial loading speed. By configuring import() to dynamically import page components in Vue Router, lazy loading of routes can be achieved. The sample code is as follows:

// 路由配置
const router = new VueRouter({
  routes: [
    {
      path: '/',
      name: 'Home',
      component: () => import('./views/Home.vue')
    },
    {
      path: '/about',
      name: 'About',
      component: () => import('./views/About.vue')
    },
    // 其他路由...
  ]
})

By using routing lazy loading, the corresponding components can be loaded again when the user accesses a specific page, thereby reducing the size of the initially loaded file and improving the loading speed.

Summary

By following the above optimization methods, we can improve the performance of Vue and Element Plus applications and speed up web page loading. While these methods may require some additional configuration and coding work, they can provide a better experience for users and make your application more competitive. Optimizing the performance of Vue and Element Plus is not only a technical task, but also a key factor in providing a good user experience.

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