How to advance vue3

With the continuous development and changes of front-end technology, Vue.js has become one of the most popular and widely used JavaScript frameworks, and the new features of Vue3 have been sought after by the majority of front-end engineers. Vue3 has improved in terms of performance, maintainability, ease of learning, adaptability, etc., and the API changes brought about by internal reconstruction have also increased the difficulty of upgrading, so how to upgrade Vue3 is more important.

1. Understand the new features of Vue3

The core of Vue3 is the reconstructed data responsive system. Vue3's data responsive system uses Proxy API instead of Object.defineProperty API. This makes Vue3 more performant and maintainable, while also enabling responsive processing of defined objects, arrays, and Maps. For Vue3, data responsiveness revolves around the Reactivity API. Among them, ref() and reactive() are the most important APIs that can be used to implement reactive data.

In Vue3, setup() is a newly added API that replaces the original data, computed and methods in 2.x. setup() is called before the component is initialized. It accepts two parameters: props and context, where props is an object of all props received by the component instance, and context is a Context object containing the component instance. The return value of setup() is an object, which defines the state and behavior that the component needs to use. It can be a responsive object, a function or a composite object.

2. Handwritten Vue3 source code

Learning Vue3 requires not only understanding its new features, but also its internal implementation. Handwritten Vue3 source code can help us deepen our understanding of its internal principles. For engineers who are new to Vue3, you can directly view the github source code of Vue3 to gain an in-depth understanding of its implementation process. If you are not familiar enough with the Vue3 source code, you can use the Vue3 source code analysis blog or online documentation to learn.

3. Using Composition API

Composition API is one of the new features in Vue3, which can achieve logic reuse and component abstraction. The Composition API of Vue3 can replace the Mixins in Vue2, solving the problems of naming conflicts and confusion caused by the use of Mixins. Compared with Vue2's Options API, the Composition API can make components clearer and more convenient for code reuse.

In Vue3, the most important functions in the Composition API are provide and inject. Provide is used to define a property in the parent component, and the child component can receive the property through inject. This enables data sharing between components. In addition, Vue3's Composition API also provides many practical functions.

4. Applying TypeScript

TypeScript is a superset of JavaScript and a JavaScript language designed for large-scale projects. TypeScript provides strong type checking, better IDE support and better code prompts, which can improve code readability and development efficiency. At the same time, Vue3's support for TypeScript has also been improved. Using TypeScript in Vue3 can make the code more readable, maintainable and easier to test.

Before using Vue3 and TypeScript, we need to install @vue/cli-plugin-typescript, and then add the content of vue.config.js to the vue attribute in package.json. If you want to use Vue3 mixing, you also need to add the <script lang="ts"> declaration in the header of the file.

5. Use with third-party libraries

While Vue3 is popular, it has also been supported by more third-party libraries. For example, Vuetify is a very popular Vue UI library that already supports Vue3. Use Vuetify to quickly build a beautiful Vue application.

In addition, the Vue3 ecosystem is already very complete. For example, vue-router already supports Vue3. If you have used vue-router in Vue2 before, you can easily migrate to Vue3.

Summary

Vue3 has been improved in terms of performance, maintainability, ease of learning, adaptability, etc. Using Vue3 is also a continuous learning process, which requires continuous understanding of its internal principles, and at the same time Combine with third-party libraries to improve efficiency. I hope this article can provide you with some advanced ideas.

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