The get function and set function in Vue3: allow you to manage data more flexibly

In Vue3, get function and set function are very important concepts. They allow you to manage your data more flexibly, and are also one of the keys to understanding the reactive principles of Vue3.

The get function and set function are a new feature in ES6, used to intercept an object's properties. When you access the property, the get function will be called, and when you modify the property, the set function will be called.

In Vue3, you can use this feature to intercept the properties of an object to achieve responsiveness. The responsive principle in Vue3 is implemented by using ES6's Proxy, and Proxy uses the get function and set function to intercept the reading and modification of object properties.

For example, we can create an object and intercept an attribute of the object:

let obj = {
  name: 'Tom',
  age: 18
}

let proxyObj = new Proxy(obj, {
  get(target, key) {
    console.log(`读取${key}属性`);
    return target[key];
  },
  set(target, key, value) {
    console.log(`修改${key}属性，新值为${value}`);
    target[key] = value;
  }
})

proxyObj.name; // 读取name属性，返回'Tom'
proxyObj.age = 20; // 修改age属性，新值为20

In the above code, we created a proxyObj object and intercepted the get and get properties of the object. set operation. When we access the attribute of proxyObj, the get function will be called and the 'read attribute name' will be output, and then the value of the attribute will be returned. When we modify the attribute of proxyObj, the set function will be called, output "modify the attribute name, the new value is the attribute value", and assign the new attribute value to the attribute.

In Vue3, using this feature, we can encapsulate the data of each component into a Proxy object to achieve responsiveness. For example:

const data = {
  name: 'Tom',
  age: 18
}

const reactiveData = new Proxy(data, {
  get(target, key) {
    console.log(`读取${key}属性`);
    return target[key];
  },
  set(target, key, value) {
    console.log(`修改${key}属性，新值为${value}`);
    target[key] = value;
  }
})

export default {
  data() {
    return reactiveData;
  },
  methods: {
    update() {
      this.name = 'Jerry';
    }
  }
}

In the above code, we encapsulate the data into a Proxy object and return the object as data in the component. When we modify the data in the component, such as executing the update method, the set function will be called to intercept, thereby achieving responsive data updates.

At the same time, we can use the Ref and Reactive APIs in Vue3 to create responsive objects. The Ref object can encapsulate a value into a responsive object, and Reactive can turn a normal object into a responsive object. The bottom layer of these two APIs also implements responsiveness by using get and set functions to intercept.

In short, the get and set functions are very important concepts in the Vue3 responsive principle. Understanding this feature can better understand the responsiveness principle of Vue3, and also allow you to manage data more flexibly. If you want to have a deeper understanding of the responsiveness principle of Vue3, it is recommended to study more about the use of get and set functions, which will be of great help to your work and study.

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