Use and instructions for script setup syntax sugar in Vue3

What is syntactic sugar in script setup in Vue3? What are its benefits?

In modern front-end development, it has always been a popular framework, and the release of Vue 3 has brought many new features and features to developers. in,script setupSyntactic sugar is one of the most eye-catching features of Vue 3.

What is script setup?

• script setupis a new syntax introduced by Vue 3 to more simplify the logic of organizing components in single file components (SFC).
• It is a form of writing based on a combination API that allows developers to<script>A simpler syntax is used in the tag to define components' properties, methods, and lifecycle hooks, and this writing method will achieve better performance optimization at compile time.

Sample code

• The following is one usedscript setupSimple Vue 3 component example:

<template>
  <div>
    <h1>{{ message }}</h1>
    <button @click="incrementCounter">Click me</button>
    <p>Current count: {{ counter }}</p>
  </div>
</template>

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

const message = ref('Welcome to Vue 3's script setup!  ');
const counter = ref(0);

const incrementCounter = () => {
  ++;
};
</script>

<style scoped>
h1 {
  color: blue;
}
button {
  margin-top: 10px;
  padding: 10px 15px;
}
</style>

• In this example, we define two responsive variablesmessageandcounter, and created a methodincrementCounterUsed to increase the count.
• passscript setup, we can directly<template>Use these variables and methods without additionalexport defaultSyntax makes the code more concise and readable.

The benefits of script setup

1. Simplify the structure of components

• Traditional Vue components need to be usedexport defaultTo define components, the code may appear bloated.
• and usescript setupAfter syntax, responsive data and methods can be directly defined, simplifying the structure of the component.
• This allows readers to understand the business logic of components more intuitively and reduce the complexity of context switching.

2. Better type deduction

• script setupProvides a simplified method of type derivation, which is particularly important in TypeScript projects.
• existsetupIn the function, TypeScript can automatically deduce the component's props, emits and data types, so that developers can more conveniently perform type checks and automatic completion, thereby improving development efficiency.

3. Enhanced performance optimization

• At compile time,script setupUsually more than normalsetupFunctions get better performance optimization.
• Since the Vue compiler knowsscript setupis a stateless option that generates rendering functions more efficiently and reduces internal overhead.
• This is especially important for applications that require high-performance rendering.

4. More intuitive API

• Combined with combination APIs,script setupMaking logical reuse easier.
• For large projects, logical reuse and management between components is a challenge, and throughscript setup, We can see more clearly all the logic used in the component, allowing us to better organize and maintain the code.

5. Support combinations of logic

• When usingscript setupWhen you can use multiple combination APIs in the same file, greatly improving code flexibility and maintainability.
• For example, we can easily introduce combined functions of different functions, such as Vue Router or Vuex related functions, and manage them in one place.
• This provides developers with stronger componentization capabilities.

Summarize

Overall, Vue 3'sscript setupSyntax sugar greatly optimizes and simplifies the compilation process. Not only does it provide a clear and easy-to-understand logical organization, improve performance, it also has good compatibility with TypeScript for applications of all sizes.

As a developer, if you haven't tried itscript setup, then now is the time. Through practice and continuous exploration, you will find the convenience and efficiency it brings. Looking forward to your full use of your Vue 3 journeyscript setupThe advantages brought by you make your development experience smoother.

In the next project, you might as well try to introduce it step by stepscript setup, I believe you will be impressed by its convenience and power.

The above is personal experience. I hope you can give you a reference and I hope you can support me more.