Let's take a look at the new methods of vue3

Vue3 New Approach

Vue.js is a popular JavaScript framework for creating modern, interactive web applications.

Vue.js has brought many new features and improvements after releasing the latest version Vue 3. This article will introduce some of the new methods of Vue 3 to help you better understand this version of the update.

1. Creating Applications

In Vue 3, the way you create applications has changed. Traditionally, we use the Vue constructor to create an instance, passing an options object as a parameter. However, in Vue 3, we use the createApp function to create the application. This function accepts a root component and configures it before calling the mount method.

Sample code:

import { createApp } from 'vue'
import App from './App.vue'

const app = createApp(App)

app.mount('#app')

2. Composition API

Vue 3 introduces a new composition API for code reuse and component logic combination. Compared with Vue 2's options API, the composition API is more concise and flexible, and easier to test and debug.

The composition API consists of two functions: setup and reactive.

· The setup function is used to initialize state, define methods and compute properties.

· The reactive function is used to create responsive objects.

Sample code:

import { reactive, toRefs } from 'vue'

export default {
  setup() {
    const state = reactive({
      count: 0
    })

    function increment() {
      state.count++
    }

    return {
      ...toRefs(state),
      increment
    }
  }
}

3. Teleport

In Vue 3, Teleport is a new component used to transmit at different locations in the DOM tree element. Teleport elements can be passed from one parent element to another without affecting the DOM structure. This makes it easy to implement features like popups in your application.

Sample code:

<template>
  <div>
    <button @click="showDialog = true">显示弹出框</button>

    <teleport to="body" v-if="showDialog">
      <div class="dialog">
        <h2>这是弹出框</h2>
        <button @click="showDialog = false">关闭</button>
      </div>
    </teleport>
  </div>
</template>

4. Fragments

Fragments are another new feature in Vue 3, which can return multiple roots at the same time in the template element. In Vue 2, there could only be one root element in a template, but in Vue 3, we can use Fragments to handle this case.

Sample code:

<template>
  <div>
    <h2>标题</h2>
    <p>段落1</p>
    <p>段落2</p>
  </div>
</template>

In Vue 3, it can be rewritten as:

<template>
  <>
    <h2>标题</h2>
    <p>段落1</p>
    <p>段落2</p>
  </>
</template>

5. Suspense

Vue 3 introduces Suspense Component used to display a placeholder before an asynchronous request completes. When making an asynchronous request, we can use the Suspense component to display a placeholder until the data is loaded before displaying the actual content.

Sample code:

<template>
  <suspense>
    <template #default>
      <div>{{ message }}</div>
    </template>

    <template #fallback>
      <div>正在加载...</div>
    </template>
  </suspense>
</template>

<script>
import { ref } from 'vue'

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

    setTimeout(() => {
      message.value = 'Hello, Vue 3!'
    }, 2000)

    return {
      message
    }
  }
}
</script>

The above are some new methods of Vue 3. I hope it will help you understand the subsequent updates of Vue 3.

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