Vue development notes: How to handle asynchronous requests and data flow management

As a front-end framework, Vue has the advantages of easy code maintenance, rich UI components, and high performance, so it is used by more and more developers. But in actual development, we often encounter problems with asynchronous requests and data flow management, and we also need to pay attention to some small details when dealing with these problems.

1. Asynchronous requests

1. Use axios
   Vue officially recommends using the axios library for asynchronous requests, which can well encapsulate requests, reduce code duplication, and support Promise API.
2. Request interception and response interception
   Through the axios interceptor, we can put some fixed request parameters in the request interceptor, and uniformly process some request error messages in the response interceptor.
3. Exception handling
   In actual use, asynchronous requests may cause some problems, such as request timeout, network interruption, etc., and exception handling logic needs to be added to the code. At the same time, pay attention to friendly prompts in error messages so that users can more clearly understand the specific causes of errors.
4. Front-end and back-end joint debugging
   In terms of requested data format and parameters, try to keep it consistent with the back-end interface to avoid request failure.

2. Data flow management

1. Use Vuex
   For Vue’s data flow management, the official recommendation is to use Vuex, which can centrally store and store the status of all components. Management, and ensuring that the state can be changed predictably through certain rules.
2. Status divided into modules
   In order to facilitate management, we can divide the status into multiple modules according to different business modules, and introduce them into the Vuex configuration using modules.
3. Mutation and Action
   Vuex is mainly composed of three parts: state, mutation and action. The state is stored in the store, Mutation is responsible for changing the state, and Action is responsible for processing asynchronous logic. Mutation can also be triggered to change the state.
4. Elegant combination
   When writing a Vuex module, you can use the structure of "container component" and "display component", so that the container component is responsible for data reading and status management, and the display component only focuses on the UI. render.
5. Loading on demand
   The states in Vuex are stored centrally. If there are too many states or components do not need to be used, you can use on-demand loading to improve performance.
6. Debugging Tools
   Vuex provides debugging tools that can help developers quickly locate problems and dynamically view changes in state during runtime.

3. Summary

As a front-end framework, Vue has good ecology, performance and hands-on experience. In actual development, handling asynchronous requests and data flow management are issues we need to focus on. Different situations require different processing methods, but it should be noted that layering logic, reducing code duplication, friendly error handling prompts, modular development, etc. are all aspects that everyone needs to consider.

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