There is no response when ajax clicks submit. The printed information is as follows, thank you.

Question

The status code is 200, OK, but the entry is error. I printed the data and found that it is not serialized data, and there is <?php in the responseText, not only here, but also in the header of the page. It has nothing to do with this

Answer 1

Check your request URL address, and process the return data. What you are setting up now is to interact with Json data format!