AJAX处理错误[重复]

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            <div class="grid--cell mb0 mt8">Closed <span title="2019-08-09 09:40:55Z" class="relativetime">9 months ago</span>.</div>
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From my backend I wrote a POST api which returns a 403 error if a condition occurs. Together with the 403 error I am also passing a JSON response. In my front end I am using an AJAX request, however I can't seem to be able to read the JSON response when this error occurs. Are there ways to handle/capture the error and then read the JSON response as well ?

I was going to use the .then method however an error still props up without returning the JSON response.

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