jQuery.ajax认为哪些响应是“成功”？

Question

I have a jQuery AJAX post request that is unexpectedly triggering the error callback instead of success . One random suspicion I have is the 302 status code it is receiving, although that may be wrong.

I looked at the documentation , but I feel like one thing is a bit unclear: What is jQuery's definition of a successful request?

Answer 1

If the response is between 199 and 300 ( >= 200 and < 300 ) or equal to 304 and the responseText can be successfully converted to the dataType that you provide (text by default), it is considered a successful request.

For example, if you return JSON and you get a 200 response status but it fails, it is more than likely a JSON parser problem meaning your JSON is not valid.

If you are returning HTML or XML and it fails with a 200 response status, the responsetext couldn't be converted to HTML or XML respectively (commonly happens in IE with invalid html/xml)