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Using SSR in Vue to improve the first screen loading speed of applications

WBOYOriginal: 2023-07-19 10:07:471568browse

With the continuous development of front-end technology, the performance optimization of front-end applications has also become the focus of developers. In modern front-end development, single-page applications (SPA) have become mainstream, and with the popularity of frameworks such as Vue and React, more and more developers choose to use these frameworks to build applications. However, SPA applications need to download and parse a large amount of JavaScript code when loading for the first time, resulting in a slow loading speed of the first screen. To solve this problem, we can use server-side rendering (SSR) to improve the loading speed of the first screen of the application.

Vue provides an officially supported server-side rendering solution, which allows us to put the rendering logic of Vue applications on the server side for execution, and send the rendering results directly to the browser, reducing the time it takes for the browser to parse JavaScript. , thus improving the loading speed of the first screen of the application.

The following is a simple example that shows how to use server-side rendering in Vue to improve the application's first screen loading speed.

First, we need to install the vue-cli scaffolding tool and create a new project:

npm install -g @vue/cli
vue create my-app

Then, we need to install some necessary dependencies in the project:

cd my-app
npm install vue-server-renderer express

Create a server.js file and write server-side logic in it. The code is as follows:

const Vue = require('vue')
const server = require('express')()
const renderer = require('vue-server-renderer').createRenderer()

server.get('*', (req, res) => {
  const app = new Vue({
    data: {
      message: 'Hello, Vue SSR!'
    },
    template: '<div>{{ message }}</div>'
  })

  renderer.renderToString(app, (err, html) => {
    if (err) {
      res.status(500).end('Internal Server Error')
      return
    }

    res.end(`
      <!DOCTYPE html>
      <html lang="en">
        <head><title>Hello</title></head>
        <body>${html}</body>
      </html>
    `)
  })
})

server.listen(3000, () => {
  console.log('Server is running at http://localhost:3000')
})

Next, add a command to package.json to start the server:

{
  "scripts": {
    "serve": "node server.js"
  }
}

Finally, We can run the following command to start the server:

npm run serve

At this point, we can view the results of server rendering by accessing http://localhost:3000. We will see that the rendering results are returned directly to the browser, and there is no delayed loading problem, which improves the loading speed of the first screen of the application.

Through the above examples, we can see that using Vue's server-side rendering technology can significantly improve the application's first screen loading speed. However, the introduction of server-side rendering also brings some additional complexity, which requires us to pay attention to some special places during the development process. For example, we cannot directly use global objects in the browser (such as window and document) in server-side rendering. We need to use special global objects provided by Vue instead. In addition, you also need to pay attention to compatibility and performance issues during the development process.

To sum up, Vue’s server-side rendering technology is a powerful tool that can help us improve the loading speed of the first screen of the application. However, there are some special considerations that need to be taken into account during use and some additional complexity is introduced. If our application requires high first-screen loading speed, then using server-side rendering is a good choice.

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