How to see vue version 2 and 3

Vue.js is an open source web front-end JavaScript framework and a progressive framework for building interactive user interfaces. Vue.js 2 is the current mainstream version of Vue.js, and Vue.js 3 is the latest version of the framework, which has been officially released. This article will compare the following four aspects to help you better understand the similarities and differences between Vue.js 2 and Vue.js 3.

1. Differences in performance

Compared with Vue.js 2, Vue.js 3 has a certain improvement in performance. Vue.js 3 provides faster compilation and runtime by using Proxy objects to enhance the performance of tracking reactive variables and shorten initialization time. At the same time, Vue.js 3 has also been optimized in terms of Virtual DOM and Tree Shaking, which can reduce the performance consumption caused by DOM operations and reduce the packaging volume.

2. Changes in API

There are certain differences in API usage between Vue.js 2 and Vue.js 3. Vue.js 3 introduces some new APIs, such as:createRenderer,createAppandTeleport (introducing the concept of Portals). These APIs can improve development efficiency, but they also require developers to relearn and adapt. In addition, Vue.js 3 has modified some existing APIs, such as the implementation method ofv-modeland the declaration method of components.

3. Complete TypeScript support

Vue.js 3 has more complete support for TypeScript. Vue.js 3 adds type definition files to TypeScript, which can provide better code hints and type checking support during development. At the same time, in Vue.js 3, there have been some changes in data types, for example: the type declaration method of component props has changed.

4. Introduction of Composition API

Composition API is a new feature introduced by Vue.js 3. It allows developers to organize and reuse component logic more flexibly. The Composition API is more powerful and flexible than the Options API of Vue.js 2, which can improve code reusability and make logical code easier to maintain and manage.

Summary:

Vue.js 2 and Vue.js 3 have their own advantages and changes, and developers need to choose the appropriate version for development. If you have high performance requirements, you can choose Vue.js 3. If the project is already running stably under Vue.js 2, you can consider using Vue.js 3 for migration and upgrade. No matter which version you use, you need to choose according to the actual situation and use the relevant APIs and features reasonably.

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