Understand the compilation optimization techniques in Vue 3 to improve application loading speed

Understand the compilation optimization techniques in Vue 3 and improve the loading speed of applications

With the development of web applications, front-end performance optimization has become the focus of developers one. Vue.js, as a popular front-end framework, not only provides rich functions, but also introduces a series of compilation optimization techniques in Vue 3 to improve the loading speed of applications. This article will introduce you to some compilation optimization techniques in Vue 3 and provide corresponding code examples.

1. Template inlining

In Vue 3, you can use the compile() function to compile the .vue file into a rendering function. Vue 3 also introduces template inlining, which can directly inline templates into rendering functions, reducing template parsing time and memory usage.

The sample code is as follows:

import { compile } from 'vue'
import HelloWorld from './HelloWorld.vue'

const { render } = compile(`
  <div>
    <h1>{{ msg }}</h1>
    <button @click="changeMessage">Change Message</button>
  </div>
`)

const app = {
  data() {
    return {
      msg: 'Hello, World!'
    }
  },
  methods: {
    changeMessage() {
      this.msg = 'Welcome to Vue 3!'
    }
  },
  render
}

createApp(app).mount('#app')

2. Static node promotion

In Vue 3, the compiler will automatically find those static nodes that will not change and add them Promoted to a constant, which can reduce traversal and comparison overhead during rendering. We can enable static node promotion by setting the hoistStatic option.

The sample code is as follows:

import { createVNode, h } from 'vue'

const app = {
  render() {
    return h('div', null, [
      h('h1', null, 'Hello, World!'),
      h('p', null, 'This is a static node.'),
      createVNode(HelloWorld)
    ])
  }
}

createApp(app).mount('#app')

3. Caching of event listeners

In Vue 3, event processing functions achieve higher performance through caching. Event listeners are cached, reducing the overhead of re-creating event listeners for each render.

The sample code is as follows:

import { createVNode, h } from 'vue'
import HelloWorld from './HelloWorld.vue'

const app = {
  data() {
    return {
      msg: 'Hello, World!'
    }
  },
  methods: {
    changeMessage() {
      this.msg = 'Welcome to Vue 3!'
    }
  },
  render() {
    return h('div', null, [
      h('h1', null, this.msg),
      h('button', { onClick: this.changeMessage }, 'Change Message'),
      createVNode(HelloWorld)
    ])
  }
}

createApp(app).mount('#app')

Through the above optimization techniques, we can significantly improve the loading speed and rendering performance of Vue 3 applications. Of course, in addition to the above tips, we can also use some auxiliary tools provided by Vue 3 to further optimize the performance of the application.

Summary:

The compilation optimization techniques in Vue 3 can help us improve the loading speed and rendering performance of the application. Through template inlining, static node promotion and event listener caching, we can reduce template parsing time, reduce traversal and comparison overhead, and reduce the number of event listener creation times, thereby improving application performance. In actual development, we can choose appropriate optimization techniques according to specific needs to obtain a better user experience.

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