Best practices for using Vuex to manage global state in Vue2.x

Vue2.x is one of the most popular front-end frameworks currently, which provides Vuex as a solution for managing global state. Using Vuex can make state management clearer and easier to maintain. The best practices of Vuex will be introduced below to help developers better use Vuex and improve code quality.

1. Use modular organization of state

Vuex uses a single state tree to manage all states of the application, extracting the state from the components, making state management clearer and easier to understand. In applications with a lot of states, Vuex states must be organized in a modular manner. Each module should have its own state, mutation, action, and getters. A module should contain everything it needs, and this includes submodules. Organizing the modules well will reduce the amount of code used to build Vue components, and also make the code more structured and easier to maintain.

2. Mutation must be synchronous and pure

Only mutations can be used to modify the state within the module. Mutations are synchronous and pure; they modify state in a specified way. When data changes, Vue will automatically update accordingly. The execution order of mutations is strictly in accordance with the order in which mutations are submitted, which also ensures that state changes are orderly.

3. Action must be an asynchronous operation

Action is used to encapsulate asynchronous operations and submit mutations to modify the status. When performing asynchronous operations, actions must be used, and mutations can only be submitted in actions. In the action, the data can be processed and then submitted, which can make the code clearer and easier to maintain. It is recommended that before using asynchronous operations, you first determine whether the current status needs to be updated to avoid problems such as repeated updates.

4. Getters are used to obtain the combined state

Getters are calculated properties in Vuex, which are used to encapsulate and operate some states or methods of the state, and then return the results. Getters can easily obtain the combined status and facilitate vue components to call and process complex business logic.

5. Decoupling components from Vuex

Vuex state changes must be submitted through mutation or action, direct modification is not allowed. This allows state changes to be tracked and maintained globally, while also ensuring data uniqueness. In order to decouple the component from the Vuex state, it is recommended to use auxiliary functions such as mapState, mapGetters, mapMutations, and mapActions within the component. These functions allow us to map Vuex state to components, avoiding the problem of using this.$store to directly access state. Can make status updates more efficient and simpler.

6. Use plug-ins to extend the functionality of Vuex

Vuex allows us to add plug-ins to extend its functionality. By writing plug-ins, we can add new features, such as Vuex-Logger, which can output the status changes of each mutation in the console. There are also external libraries like localStorage, which we can use as plug-ins to integrate them into Vuex. Through plugins, we can greatly extend the functionality of Vuex and make it even more powerful.

7. Unified management of Vuex errors

When using Vuex, because its state is globally shared, it may cause some unexpected errors, such as mutation, action naming conflicts, etc. Therefore, in order to maintain healthier and more stable code, it is recommended to manage Vuex errors uniformly. You can create one or more error handling functions in the project to handle various Vuex error situations and reference them at the corresponding location.

Summary:

Using Vuex can make state management clearer and easier to maintain, but to use it well, you need to follow the above best practices. Vue2.x is an extremely powerful front-end framework that provides us with many convenient and maintenance-friendly tools. By mastering the use of Vuex and following best practices, we can build high-quality Vue applications, get better code quality, and higher development efficiency.

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