Practical development skills that VUE3 beginners must know

Vue3 is one of the most popular front-end frameworks currently and many developers are using it to build web applications. However, whether you are a newbie or a developer with some experience, you will find that Vue3 has a steep learning curve. This article will discuss some crucial tips that will help you better build web applications using Vue3.

1. Use the setup function

The most significant change in Vue3 is the addition of the setup function. In Vue2, we have to use the optional API or the object API to define the properties and methods of the Vue instance. But in Vue3, you can also use the setup function to define these properties and methods.

Using the setup function has many benefits. First, it's more reusable. You can encapsulate some functional logic in a function and use it in multiple components. Plus, it makes your components easier to test and debug.

2. Use Composition API

Composition API is a new feature in Vue3. It allows us to organize and reuse code more easily. Using the Composition API, we can aggregate related code together.

Composition API solves some problems in Vue2. For example, code in Vue2 can be difficult to reuse because it is fragmented by component-optional APIs. The Composition API allows us to use logical composition instead of inheritance.

3. Use ref and reactive

In Vue3, ref and reactive are two very important concepts. They are the core of reactive programming in Vue 3.

ref can convert a normal JavaScript variable into a reactive variable. For example:

import { ref } from 'vue'

const count = ref(0)

Now, the count variable is a reactive variable, which will automatically notify the view to update when it changes.

reactive can convert a normal JavaScript object into a responsive object. For example:

import { reactive } from 'vue'

const person = reactive({
  name: '张三',
  age: 30,
})

If you change a property of the person object, the related view will be updated.

4. Using watch and watchEffect

watch and watchEffect are also very important concepts in Vue3. They are both used to monitor changes in reactive data and perform some operations.

watchEffect is a more concise method that only requires one function. This function will be automatically called when the reactive data it depends on changes.

watch is more flexible. It can monitor any responsive data and perform some complex operations when the data changes. For example:

watch(person, (newValue, oldValue) => {
  console.log(`名字从 ${oldValue.name} 变成了 ${newValue.name}`)
})

5. Use teleport

teleport is a new feature in Vue3 that is used to insert the HTML of a component into any location in the application.

In Vue2, we use slots to insert the component's HTML into the parent component. However, slots only work at specific locations in the parent component's template.

In Vue3, teleport allows us to insert component HTML anywhere. For example:

<teleport to="body">
  <div class="modal">
    <!-- 在这里放置模态框的内容 -->
  </div>
</teleport>

6. Using Suspense

Suspense is another new feature in Vue3. It is used to load components and data asynchronously. For example, if your view needs to get data from the server, you can use Suspense to display a loading status.

<template>
  <Suspense>
    <template #default>
      <h1 v-if="title">{{ title }}</h1>
    </template>
    <template #fallback>
      <h1>Loading...</h1>
    </template>
  </Suspense>
</template>

<script>
  import { ref } from 'vue'
  import { fetchData } from './api'

  export default {
    setup() {
      const title = ref(null)

      fetchData().then(data => {
        title.value = data.title
      })

      return { title }
    }
  }
</script>

The above are the practical development tips that Vue3 beginners must know. They will help you better use Vue3 to build web applications. If you are learning Vue3, be sure to master these tips and keep learning.

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