What happened when the uniapp interface was requested twice?

Recently, when a developer was developing using the uniapp framework, he found that the interface was requested twice, resulting in data anomalies and performance degradation. In response to this problem, through debugging and analysis, we have summarized several possible situations and solutions and shared them with you.

1. Code logic problem: Check whether the interface is repeatedly called in the code

First, we need to check whether there are repeated calls to the interface in the code. Sometimes we may call the same interface in two different functions, causing the interface to be requested repeatedly.

Solution: Call the interface separately in each function to avoid repeated calls in the code. If you really need to call the same interface in multiple functions, you can cache the interface request results in the store to avoid repeated requests.

2. Network problem: Check whether the network is unstable, causing the interface request to be automatically retried after failure.

In addition, network problems may also cause the interface request to be executed twice. When the network is unstable, the interface request may fail, and uniapp will automatically retry by default, causing the interface to be executed twice.

Solution: Add an exception handling mechanism to handle the problem in a timely manner when the interface request fails. In uniapp, you can use the try...catch statement block to catch exceptions and handle them accordingly to avoid automatic retries.

3. Life cycle issues: Check whether the interface request is triggered multiple times in the life cycle

In uniapp, pages or components have different life cycle functions, such as created, mounted, onShow, etc. Each execution of a life cycle function triggers an interface request. If the interface request is triggered in multiple life cycle functions, the interface request will be executed multiple times.

Solution: Use various life cycle functions reasonably in the code and avoid triggering interface requests in multiple life cycle functions as much as possible. If you really need to trigger interface requests in multiple life cycle functions, you can use function throttling or anti-shaking technology to avoid too many interface requests.

4. Event binding issue: Check whether event binding triggers interface requests repeatedly

In uniapp, event binding may also cause interface requests to be triggered repeatedly. For example, when we bind a click event to a button, an interface request will be triggered every time the button is clicked. If you click too fast or multiple times, the interface will be triggered repeatedly.

Solution: Optimize the event binding logic in the code to avoid triggering events multiple times in a short period of time. Function throttling or anti-shake technology can be used to limit events and avoid excessive interface requests.

Summary: The uniapp interface is requested twice, which may be caused by code logic problems, network problems, life cycle problems, event binding problems and other reasons. In order to avoid repeated requests to the interface, we can add exception handling mechanisms, rationally use life cycle functions, optimize event binding logic, etc. I hope this article will help you solve the problem of uniapp interface request being executed twice.

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