VUE3 basic tutorial: Using Vue.js state management

Vue.js is a modern JavaScript framework for building web user interfaces. It is a very popular framework and widely used among developers. An important feature of Vue.js is state management, allowing you to manage the flow and control of data within your application. In this article, we will introduce the basics of Vue.js state management and show how to use Vue.js to manage state.

Vue.js state management foundation

Vue.js state management is implemented based on the Vuex library. Vuex is a state management library specifically for Vue.js, used to manage the propagation and sharing of data within applications. Vuex includes four basic concepts: state, mutations, actions, and getters.

State:

State represents the state of an application and represents the storage of all data in Vue.js. It is a storage container that stores data from our application.

Mutations:

Mutations are a way to change state. It can only be executed in the state object. It can only be synchronous and cannot handle asynchronous operations.

Actions:

Actions are used to receive asynchronous requests from Vue components and use mutations to update the application's state. It can get data from the server side and use mutations to update the state of the application after receiving the data.

Getters:

Getters allow you to get specific data from the state. It is similar to a computed property. This feature can be used to easily obtain status data.

Using Vue.js State Management

In this section, we will show how to use state management in a Vue.js application.

Install Vuex:

First, we need to install the Vuex library. Install using the npm package manager in your Vue.js application.

npm install vuex

Build state:

Next, we need to create a state in our application. This state is a JavaScript object that contains our data and mutable state.

const store = new Vuex.Store({
state: {

count: 0

}
})

The above code snippet creates a count state, The initial value of count is 0. The store object allows us to access state variables. We can use this state in different parts of the application to display and update data.

Access status:

Now that we have stored the count status in the store object, the next step is to obtain the status. For this purpose, we use getters to access the status:

getters: {

getCount: state => state.count

}

The above code defines a getter: getCount, which returns the value of the count status .

Update status:

Next, we need a mutation to update our status.

mutations: {

increment (state) {
    state.count++;
},
decrement (state) {
    state.count--;
}

}

The above code snippet defines two mutations: increment and decrement. These two mutations are used here to increment and decrement the counter.

Using State:

Now that we have defined our state, getters, and mutations, we can use these values ​​in our Vue.js components.

d477f9ce7bf77f53fbcf36bec1b69b7a
dc6dce4a544fdca2df29d5ac0ea9906b

<h1>{{getCount}}</h1>
<button @click="increment">Increase</button>
<button @click="decrement">Decrease</button>

16b28748ea4df4d9c2150843fecfba68
21c97d3a051048b8e55e3c8f199a54b2

3f1c4e4b6b16bbbd69b2ee476dc4f83a
export default {

methods: {
  increment () {
    this.$store.commit('increment')
  },
  decrement () {
    this.$store.commit('decrement')
  }
},
computed: {
  getCount () {
    return this.$store.getters.getCount
  }
}

}
2cacc6d41bbb37262a98f745aa00fbf0

The above code shows how to use our state, getters and mutations in Vue components. We use increment and decrement mutations, and getCount getter to get the status. In this way, we can use state in the component to display and update data.

Conclusion

Vue.js state management is a flexible tool that can easily manage the flow of data in an application. By using the built-in state management in Vue.js or using third-party libraries, we can easily manage the state of our application. When using state management in a Vue.js application, remember that the state should only contain your application's data and not any logic. State management should be kept simple and clear so that it ensures good maintainability and scalability of the application.

The above is the detailed content of VUE3 basic tutorial: Using Vue.js state management. For more information, please follow other related articles on the PHP Chinese website!