Asynchronous requests are all like this. You have to consider network fluctuations, server processing time and so on. A request may not be sent and received first. The return order of
is not necessarily normal. I thought you sent it in a different order.
to be exact, the order of console calls is out of order, because the response time of different interfaces is different, and the time of calling your replys = > {console.log (index)} method is different
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