How does Vue implement JSX syntax and component programming?

Vue is a popular front-end framework that provides a component-based development model. However, Vue does not natively support JSX syntax, but we can implement JSX syntax and component programming by using third-party libraries.

1. What is JSX

JSX is an extension syntax of JavaScript that can write code similar to HTML in JavaScript. React is the first front-end framework to introduce JSX syntax. Using JSX syntax can describe the UI components and interactive behaviors of the application more naturally and conveniently. JSX will be converted into ordinary JavaScript function calls by the compiler, and only the corresponding objects will be generated during execution instead of directly manipulating DOM elements, thus improving the performance of the application.

2. Use the babel-plugin-jsx-v-model plug-in to implement JSX syntax

Vue creatively uses template syntax, but many developers like to use JSX syntax to describe components because It can be more intuitive and convenient. Therefore, we can use the babel-plugin-jsx-v-model plug-in to make Vue support JSX syntax.

First install the plug-in:

npm install babel-plugin-jsx-v-model --save-dev

Then add in the .babelrc or babel.config.js file:

{
  "plugins": ["jsx-v-model"]
}

Now, Vue can recognize JSX syntax.

3. Use Vue Class Component to implement component programming

In addition to supporting JSX syntax, Vue can also implement a class-based component development model through the Vue Class Component library, which is similar to Angular. Vue Class Component provides the ability to define components from classes, allowing for better organization of code. We can achieve this through the following steps:

1. First, we need to install the Vue Class Component:

npm install vue-class-component --save

2. In our component file, import Vue and Vue Class Component and use the decorator to define the component:

import Vue from 'vue'
import Component from 'vue-class-component'

@Component
export default class HelloWorld extends Vue {
  // 定义组件代码
}

We can see that the component code is now defined in a class.

3. Use decorators to define component properties:

import Vue from 'vue'
import Component, { Prop } from 'vue-class-component'

@Component
export default class HelloWorld extends Vue {
  @Prop(String) message!: string

  // 定义组件代码
}

We can declare component properties through the @Prop decorator, and we can declare the type and default value of the property.

4. Use components in templates:

<template>
  <div>
    <h1 id="message">{{ message }}</h1>
  </div>
</template>

<script lang="ts">
import Vue from 'vue'
import Component, { Prop } from 'vue-class-component'

@Component
export default class HelloWorld extends Vue {
  @Prop(String) message!: string
  
  // 其它组件代码
}
</script>

In this way, a component based on Vue Class Component is completed.

Summary

On the basis of supporting template syntax, Vue can also implement JSX syntax and development mode based on class-defined components through third-party libraries, which demonstrates the flexibility and scalability of Vue. . Different developers can choose which way to write Vue components according to their own preferences and habits.

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