Improvements of Vue3 over Vue2: a better open source community

Improvements of Vue3 over Vue2: A better open source community

With the continuous development of Internet technology, the front-end framework is also constantly updated and iterated. As a popular front-end framework, Vue.js has always been loved by developers. Vue3, which was officially released in 2020, has made many important improvements compared to Vue2, making Vue.js even more outstanding in the open source community.

First of all, Vue3 has made many optimizations in the implementation of virtual DOM, which has significantly improved rendering performance. The virtual DOM in Vue2 needs to perform a complete diff algorithm every time the data is updated to compare the differences before updating the DOM. This method has lower performance when updating large-scale data. Vue3 uses static compilation optimization based on the observer mechanism to compile templates into rendering functions, avoiding the complete diff process, thereby improving rendering performance.

Let's look at a specific code example:

// Vue2 的代码示例
<template>
  <div>
    <p>{{ message }}</p>
    <button @click="changeMessage">修改消息</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      message: 'Hello Vue2'
    }
  },
  methods: {
    changeMessage() {
      this.message = 'Hello Vue2.0'
    }
  }
}
</script>

In this example, when the button is clicked, the value of the message will be modified to 'Hello Vue2.0'. Vue2 will then perform a complete diff process, find the differences, and then update the DOM.

Now let’s take a look at the improvements of Vue3:

// Vue3 的代码示例
<template>
  <div>
    <p>{{ message }}</p>
    <button @click="changeMessage">修改消息</button>
  </div>
</template>

<script>
import { reactive } from 'vue'

export default {
  setup() {
    const data = reactive({
      message: 'Hello Vue3'
    })

    const changeMessage = () => {
      data.message = 'Hello Vue3.0'
    }

    return {
      message: data.message,
      changeMessage
    }
  }
}
</script>

In Vue3, we use the reactive function to turn the data object into a responsive one. When the data is When the properties of the dependencies change, Vue3 will automatically track the dependencies and perform partial updates without the need for a complete diff process.

In addition to optimizing virtual DOM performance, Vue3 also adds many new features and APIs to make the development experience more powerful. For example, the introduction of the Composition API allows the logic of components to be organized and reused more clearly. Compared with the Options API in Vue2, the Composition API can group related function codes together, improving the maintainability of the code.

In addition, Vue3 has also optimized its support for TypeScript, making it easier for developers to use type checking and smart prompts, reducing errors during the development process.

To sum up, Vue3 has significantly improved performance and functionality compared to Vue2, making it a better open source front-end framework. Developers can improve project development efficiency and user experience by using Vue3.

Reference materials:

1. Vue.js official documentation: https://v3.vuejs.org/
2. Evan You’s Vimeo video: https:// vimeo.com/376032605

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