The difference between Vue3 and Vue2: faster build tool chain

The difference between Vue3 and Vue2: faster construction tool chain

Upgrading from Vue2 to Vue3, developers can look forward to a faster and more efficient construction tool chain. Vue3 introduces many new features and improvements, making the development process more concise, flexible and easy to maintain. This article will introduce the differences between Vue3 and Vue2 in building tool chains and provide some specific code examples.

1. Composition API
Vue3 introduces a new Composition API, thus providing developers with a more flexible code organization method. Compared with Vue2's Options API, the Composition API is more intuitive, easier to read and maintain.

Code example:

Vue2 Options API:

export default {
  data() {
    return {
      message: 'Hello, Vue2!'
    }
  },
  methods: {
    handleClick() {
      this.message = 'Vue2 is awesome!'
    }
  }
}

Vue3 Composition API:

import { ref } from 'vue'

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

    const handleClick = () => {
      message.value = 'Vue3 is awesome!'
    }

    return {
      message,
      handleClick
    }
  }
}

2. Faster rendering
Vue3 passes the updated Virtual DOM algorithm and optimized rendering process achieve faster rendering performance. This significantly improves page response speed in large applications.

Code example:

Vue2 Rendering process:

<div>
  <h1>{{ title }}</h1>
  <ul>
    <li v-for="item in list" :key="item.id">{{ item.name }}</li>
  </ul>
</div>

Vue3 Rendering process:

<template>
  <div>
    <h1>{{ title }}</h1>
    <ul>
      <li v-for="item in list" :key="item.id">{{ item.name }}</li>
    </ul>
  </div>
</template>

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

const title = ref('Vue3 Demo')
const list = ref([
  { id: 1, name: 'Apple' },
  { id: 2, name: 'Banana' },
  { id: 3, name: 'Orange' }
])
</script>

3. More powerful TypeScript support
Vue3 in TypeScript The support has been comprehensively upgraded, providing more powerful type derivation and type checking functions. This makes writing code more reliable and secure, reducing the likelihood of errors.

Code example:

Using TypeScript in Vue2:

<template>
  <div>
    <h1>{{ title }}</h1>
  </div>
</template>

<script lang="ts">
import Vue from 'vue'

export default Vue.extend({
  data() {
    return {
      title: 'Vue2 with TypeScript'
    }
  }
})
</script>

Using TypeScript in Vue3:

<template>
  <div>
    <h1>{{ title }}</h1>
  </div>
</template>

<script setup lang="ts">
import { ref } from 'vue'

const title = ref('Vue3 with TypeScript')
</script>

Summary:
Compared with Vue2, Vue3 Many improvements have been made to the build toolchain, providing a faster and more efficient development experience. Through the Composition API, fast rendering, and powerful TypeScript support, developers can organize code more flexibly, achieve faster rendering, and more reliable type checking. In the future, we can be more inclined to use Vue3 in project development and use its more efficient construction tool chain to improve development efficiency and code quality.

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