javascript - jquery ajax uses jsonp for cross-domain access, why does it report an error?

Question

[1]http://120.76.117.29:12345/ap...
This is the access path copied in the network
Is this an error?
What's wrong?
Is there a problem with the data returned by the background? This is my js code

Answer 1

Why doesn’t your fourth parameter have a name?

Answer 2

The return data is not enclosed in parentheses, or the callback function name is not added in ajax

Answer 3

The parameter should be jsonp not jsonpCallback