The reactive function in vue3 is used to create responsive data

What is Reactive Data?

Reactive data refers to data that can automatically update related dependencies and influences when the data changes. In Vue, reactive data is implemented through Vue's reactive system.

Responsive data in Vue refers to converting ordinary data into responsive data through specific methods provided by Vue (such as Vue.observable, Vue.observableArray, etc.). When the responsive data changes, the relevant views will automatically renew.

Vue's responsive system implements a dependency tracking mechanism, which records all places where responsive data is used, and establishes dependencies between data and views. When the responsive data changes, the system will automatically trigger the corresponding dependencies, perform update operations, and keep the view and data in sync.

In Vue, by declaring the data as responsive, you can achieve the effect of data-driven view, without manual manipulation of DOM, you only need to pay attention to the changes of data, and the view will be automatically updated.

Responsive data is one of the core features of Vue, which allows developers to build responsive user interfaces more easily, and has a high degree of maintainability and flexibility.

 

When using Vue 3's Composition API, reactivefunctions can be used to convert plain JavaScript objects into responsive ones.

Here is reactivean example usage of the function:

import { reactive } from 'vue';

// 创建一个普通的JavaScript对象
const user = {
  name: 'Alice',
  age: 25,
};

// 将对象转换为具有响应式能力的对象
const reactiveUser = reactive(user);

// 在模板或组件中使用响应式对象
console.log(reactiveUser.name); // 输出: 'Alice'

// 修改对象的属性
reactiveUser.name = 'Bob';

// 自动更新相关依赖
console.log(reactiveUser.name); // 输出: 'Bob'

In the above example, reactivethe function transforms userthe object into a reactive-capable reactiveUserobject. Afterwards, when reactiveUserthe object's properties change, the views associated with it will be automatically updated.

It is important to note that reactivefunctions can only convert plain JavaScript objects into reactive ones. If you need to convert an array into an array with responsive capabilities, you need to use reffunctions or toReffunctions for processing.