Improvements of Vue3 compared to Vue2: better development experience

Improvements of Vue3 over Vue2: Better development experience

With the continuous development of front-end technology, Vue.js, as a popular JavaScript framework, is also constantly being improved and updated. Vue.js 3.0 is the latest version of Vue.js. Compared with Vue.js 2.x, it brings some exciting improvements so that developers can enjoy a better development experience.

1. Composition API

Vue3 introduces the Composition API, which is one of the biggest improvements of Vue3. The Composition API provides developers with a more flexible and reusable way of writing components. It allows developers to organize code according to functionality or logic rather than according to component lifecycle hook functions.

The following is an example of a counter component written using the Composition API:

<template>
  <div>
    <button @click="increment">增加</button>
    <p>{{ count }}</p>
  </div>
</template>

<script>
import { ref } from 'vue';

export default {
  setup() {
    const count = ref(0);

    const increment = () => {
      count.value++;
    };

    return {
      count,
      increment,
    };
  },
};
</script>

In the above example, we use the ref function to create a responsive state variable count, and then defines an increment function to increment the counter value. Finally, return these two variables and functions in the setup function.

Through the Composition API, we are no longer limited to the life cycle hook function of Vue2, can organize the code more freely, and can reuse logic more easily. This greatly improves development efficiency and code maintainability.

2. Better TypeScript support

Vue3’s support for TypeScript has also been improved. In Vue3, type inference is more accurate and more friendly when using TypeScript in components. Vue3 also introduces a new defineComponent function, which can help TypeScript correctly infer the this type.

The following is an example of a simple component written in TypeScript:

<template>
  <div>
    <p>{{ message }}</p>
  </div>
</template>

<script lang="ts">
import { defineComponent, ref } from 'vue';

export default defineComponent({
  setup() {
    const message = ref('Hello, Vue3!');

    return {
      message,
    };
  },
});
</script>

In the above example, we used TypeScript type annotations to declare that the type of message is string, and use the defineComponent function to define the component. Vue3 will correctly infer the type of message based on the type annotation. In this way, we can use type checking more easily and avoid some errors and hidden dangers when writing components.

3. Better performance

Vue3 optimizes performance to make the application more efficient at runtime. Vue3 introduces a responsive system based on Proxy. Compared with Vue2's Object.defineProperty, Proxy can track changes and update views more efficiently.

In addition, Vue3 also improves the virtual DOM algorithm, introduces static marking and promotion, and reduces unnecessary re-rendering and updates. These optimizations have significantly improved the performance of Vue3.

4. Better tool chain support

The improvements of Vue3 are not only reflected in the framework itself, but also in its cooperation with the tool chain. Vue CLI is the official scaffolding tool of Vue.js. Vue3 upgrades Vue CLI and supports more functions and optimizations.

Vue3 also provides better developer tool support, including browser plug-ins and VS Code plug-ins. These tools provide developers with a better debugging and development experience.

To sum up, Vue3 brings a better development experience compared to Vue2. Through the Composition API, developers can organize code more flexibly; better TypeScript support allows developers to use type checking more conveniently; performance optimization and tool chain upgrades make applications more efficient, easier to develop and debug.

Whether it is a new project or the migration of an existing project, using Vue3 is a good choice. It not only brings a lot of improvements, but also maintains the elegance and simplicity of Vue.js, allowing us to develop high-quality web applications more quickly.

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