Vue3 Function Usage Guide: In-depth understanding of the core functions of Vue3

Vue3 is a powerful front-end framework, and its core part is some very important functions. This article takes a closer look at these core functions and explains how to use them to build powerful applications.

1. createApp function

The createApp function is the entry point of Vue3 and it is the first step in creating a Vue application. Use it to create a Vue instance and return an application object.

The syntax of the createApp function is as follows:

const app = Vue.createApp(options);

Among them, options is an object that contains the configuration of our application.

2. reactive function

The reactive function is another important Vue3 function, which is used to create a reactive object. Reactive objects can dynamically update their properties and trigger re-rendering of views.

The syntax of the reactive function is as follows:

const state = Vue.reactive(object)

Among them, object is an ordinary JavaScript object, and the properties in it will become responsive properties.

3. watchEffect function

The watchEffect function is used to create a responsive listener. It listens for changes in reactive objects and executes callback functions when they change.

The syntax of the watchEffect function is as follows:

Vue.watchEffect(effect, options)

Among them, effect is a function that contains the callback logic of the listener. Options is a configuration object that contains listener options, such as delay, depth, immediate execution, etc.

4. computed function

The computed function is used to create a computed property. A computed property is a responsive property whose value is calculated and can be cached.

The syntax of the computed function is as follows:

const computedValue = Vue.computed(getterFunction)

Among them, getterFunction is a getter function that calculates attributes.

5. provide and inject functions

The provide and inject functions are used to share data between components. The provide function is used to provide data, and the inject function is used to inject data.

The syntax of the provide and inject functions is as follows:

const app = Vue.createApp({
  provide: {
    key: value
  }
});

const someChildComponent = {
  inject: ['key'],
  // ...
}

Among them, key is the key of the shared data, and value is the value of the shared data.

The above is an introduction to the core functions of Vue3. These functions are the key to building Vue applications. By understanding and using these functions flexibly, we can build more robust and efficient Vue applications.

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