The reason why the function is called twice when getJSON calls background json data
Recently, when I was doing front-end development, I used getJSON to call the background to json data. I found that the background function was called twice, and the function name was getMessages.
Multiple investigations combined with online brother experience found that as long as the function name does not start with get, there is no problem.
It is bold to guess that when constructing json data when requesting returns, call all functions starting with get, then get the return value and then construct the response.
Therefore, when a function starting with a function that acts as an action, it is first called once in response to the request, and then the constructed response is called again.
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