How to use vue just after updating

Vue.js is a popular front-end framework, and its latest version, Vue 3.0, was officially released in September 2020. The new version brings some major changes, including better performance, better TypeScript support, and an easier way to write code. This article will introduce how beginners can use Vue.js 3.0.

1. Install Vue.js 3.0

Before starting to use Vue 3.0, we need to install Vue.js first. Vue 3.0 can be installed via npm.

We can open a console window and enter the following command in it:

npm install vue@next

This will install Vue.js 3.0 locally. We can use the following command to check our installed Vue.js version at any time:

vue --version

2. Create a Vue.js application

We can use Vue CLI 4 to create a new Vue. js application. Vue CLI 4 is a command line interface tool that can help us generate a project skeleton, provide out-of-the-box configuration, and quickly build a Vue.js application.

If you have not installed Vue CLI 4, open a console window and enter the following command:

npm install -g @vue/cli

During the installation process, you may be required to enter your administrator password.

After the installation is complete, we can create a new Vue.js application. Please enter the following command in the console window:

vue create my-vue-app

This command will create a new project named "my-vue-app". During project creation, you can choose to use the default settings or modify them as needed.

3. Run the Vue.js application

After completing the creation of the Vue.js application, we can enter the root directory of the application and run the following command to start the development server:

cd my-vue-app
npm run serve

This command will start a local web service so that you can run your Vue.js application on your local computer.

Enter http://localhost:8080/ in the browser to open the application.

4. Start writing Vue.js applications

Now, we are ready to start writing Vue.js applications. In Vue.js 3.0, the way you define your application is slightly different than before.

The following is a simple example that will display a button and when the button is clicked, a message will be displayed on the screen:

<template>
  <div>
    <button @click="showMessage">显示消息</button>
    <p>{{ message }}</p>
  </div>
</template>

<script>
import { reactive } from 'vue'

export default {
  setup() {
    const state = reactive({
      message: ''
    })

    function showMessage() {
      state.message = '欢迎来到 Vue 3.0!'
    }

    return {
      ...state,
      showMessage
    }
  }
}
</script>

You can copy and paste this code into my-vue -app/src/App.vue file and save the file.

While the app is running, you will see a button. When the button is clicked, a message will appear on the screen saying "Welcome to Vue 3.0!".

5. Summary

Vue.js 3.0 brings many improvements and changes to make the framework easier to use and more efficient. In this article, we covered how to install and use Vue 3.0, and how to write applications using the new Vue.js 3.0 syntax. I hope this article was helpful and start building your next web application with Vue.js 3.0!

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