The difference between Vue3 and Vue2: lighter package size

The difference between Vue3 and Vue2: More lightweight packaging size

Vue.js is a popular JavaScript framework for building user interfaces and single-page applications. Since the release of Vue.js version 2.x, it has become a very popular choice among front-end developers. However, with the release of Vue.js 3, many new features and improvements have made it a better choice. One of the most significant improvements is Vue3's optimization of package size, making applications more lightweight.

The optimization of Vue3 packaging size is mainly reflected in 4 aspects:

1. More efficient Tree-Shaking

Vue3 adopts a new compilation template method , which compiles templates into smaller and more efficient code. In the new version, the process of compiling templates is more intelligent, and better code tree shaking performance is achieved through Tree-Shaking technology. This means that in Vue3, only the parts actually used in the application will be packaged into the final build result, reducing unnecessary code, thereby reducing the packaging size of the application.

2. Support modularity

Vue3 fully supports ES modularization and organizes and loads code by using the ES module system. Compared with the previous Vue2, this modular approach is more lightweight. By splitting an application into independent modules, code can be better managed, and modules can be more easily shared and reused during development. In this way, duplicate code can be reduced, and only the modules used during the build process need to be packaged, thus reducing the packaging size.

3. Static component promotion

Vue3 introduces an optimization technology called static component promotion. In Vue2, every time a component is rendered, a new reactive instance is created, which consumes a certain amount of memory and performance. In Vue3, through a new compilation method, static components can be detected and converted into ordinary JavaScript objects, thereby reducing unnecessary instantiation and having a lighter packaging size.

The following is a simple example showing how to use static component promotion in Vue3:

<!-- MyComponent.vue -->
<template>
  <div>
    <h1>我是静态组件</h1>
    <p>{{ message }}</p>
  </div>
</template>

<script>
export default {
  setup() {
    const message = 'Hello Vue3!'
    return { message }
  }
}
</script>

<!-- App.vue -->
<template>
  <div>
    <MyComponent />
  </div>
</template>

<script>
import MyComponent from './MyComponent.vue'

export default {
  components: { MyComponent }
}
</script>

In the above example, the MyComponent component is marked as a static component, and Referenced in App.vue. This means that the MyComponent component will only be instantiated once when the application is initialized, and will not be re-instantiated as the component is repeatedly rendered, thereby improving application performance and reducing bundle size .

4. Better Tree-Shaking and lazy loading

In Vue3, through the new composition API and import()Asynchronous loading, Vue .js allows for more precise tree-shaking and lazy loading. This means that the relevant code will only be loaded and run when needed. This optimization can help reduce the size of your application and improve loading speed and performance.

To sum up, Vue3 makes the application more lightweight at runtime by optimizing several aspects of packaging size. Through more efficient Tree-Shaking, support for modularization, static component promotion, and better Tree-Shaking and lazy loading, Vue3 reduces unnecessary code and resources and optimizes application performance and loading speed. Therefore, when choosing a Vue.js version, it is well worth considering Vue3's packaging optimization.

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