How to reference vue in nodejs

With the popularity of Vue, more and more developers hope to use Vue in Node.js. So, how to reference Vue in Nodejs? This article will cover this aspect in detail.

First of all, it should be clear that Node.js, as a server-side JavaScript running environment, cannot directly render Vue components. However, there are some ways we can use Node.js with Vue, the most commonly used of which is to use Vue's SSR (Server-Side Rendering) mode.

Using SSR mode allows us to precompile Vue components on the server side and output HTML files to the browser. This can improve the rendering speed of the page and is more conducive to SEO optimization. Next, we will use SSR to reference Vue as an example to introduce how to use Node.js to reference Vue.

1. Installing Vue

First, we need to install Vue in Node.js. You can use npm to install:

npm install vue

2. Write Vue component

Next, we need to write a Vue component. In this article, we only need a simple component to demonstrate, as shown below:

<template>
  <div>
    <h1 id="message">{{ message }}</h1>
  </div>
</template>

<script>
export default {
  data () {
    return {
      message: 'Hello, Vue!'
    }
  }
}
</script>

In this component, we just output a simple message: Hello, Vue!.

3. Using Vue SSR

Next, we need to use Vue’s SSR mode to precompile. In Node.js, we can use the createRenderer method in Vue SSR to precompile. It will return a renderer that we can use to render Vue components as follows:

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

renderer.renderToString(new Vue({
  template: '<div>Vue组件</div>'
}), (err, html) => {
  console.log(html) // 输出预编译后的HTML
})

In this code, we first introduce vue and vue- server-renderer depends on it and uses the createRenderer method to create a renderer. Then, we call the renderToString method to render using the precompiled Vue component and output the HTML file. As you can see here, we need to convert the Vue component into a template before it can be used.

4. Convert components to templates

In the process of using SSR, we need to convert Vue components into templates. We can use some tools to handle this conversion process. For example, we can install vue-template-compiler to convert:

npm install vue-template-compiler

Then, we can use vue-template-compiler’s compileMethod to convert the Vue component into a template, as shown below:

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

const template = compiler.compile('<div>Hello, {{ name }}!</div>').render
const context = { name: 'Vue' }

renderer.renderToString(new Vue({
  template: template,
  data: context
}), (err, html) => {
  console.log(html) // 输出预编译后的HTML
})

In this code, we use the compile method of vue-template-compiler to convert the Vue component Convert to a template, and pass the rendering context (that is, the data of the component) into the renderer for rendering.

5. Conclusion

In this article, we introduced how to reference Vue in Node.js and use its SSR mode for precompilation. It should be noted that using SSR requires precompiling Vue components on the server side, so it will occupy server resources. Therefore, in actual development, we need to weigh which method of using SSR and front-end rendering is more suitable for our application scenarios.

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