Immutable constant data storage in vue

Vue is a popular JavaScript framework that provides many convenient features for building interactive web applications. In Vue applications, sometimes we need to store some immutable constant data, such as API addresses, enumeration values, etc. In this article, we will introduce some common methods of storing immutable constant data in Vue.

1. Using Vue global variables

Vue.js provides a global variable Vue that can be accessed in the application. We can use the $set method to define global constants.

Vue.prototype.$API_URL = 'http://example.com/api';

In the above code, we added a $API_URL attribute on Vue's prototype and set it to the value of a constant. In this way, we can access the constant through this.$API_URL in any component of Vue.

However, it should be noted that although this method is very simple, global variables may be accidentally modified by other developers, causing application errors. In addition, this method is not suitable for scenarios where constant values ​​need to be dynamically generated.

2. Using Vuex

Vuex is the official state management tool of Vue.js. It can be used to store and manage various state data in the application, including unchanged constant. We can use Vuex to store constant values ​​and access them in Vue components.

import Vue from 'vue';
import Vuex from 'vuex';

Vue.use(Vuex);

const store = new Vuex.Store({
  state: {
    API_URL: 'http://example.com/api'
  }
});

export default store;

In the above code, we create a Vuex instance named store and define the value of the constant API_URL in the state attribute. This value can be accessed in the Vue component through this.$store.state.API_URL.

Compared with global variables, using Vuex for management has higher maintainability and organization. We can easily call Vuex state in all components without having to manually deal with the scope of global variables.

3. Using constant files

In Vue, we can use constant files to store the constant data of the application. A constant file is a JavaScript file that contains all the immutable constant data used in the application. For example, we can define a constant API_URL in the file and set it to a certain URL string.

export const API_URL = 'http://example.com/api';

In the above code, we export the constant API_URL as a JavaScript constant, then import and use it in other Vue components.

import { API_URL } from './constants';

export default {
  created() {
    console.log(API_URL);
  }
}

In the above code, we import API_URL from the constant file and print its value in the component's created hook.

The advantage of using constant files is that it can better organize the constant data of the application, avoid variable pollution, and improve the readability and maintainability of the file.

Conclusion

In Vue applications, storing constant data is a necessary operation. We can use global variables, Vuex or constant files to store these constant data. Under different scenarios and needs, we should choose the most suitable method to use them.

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