Javascript： contentType: ?1 是什么意思？

Question

I have seen in multiple cases where the contentType , cache etc are mentioned as !1 . Haven't seen much documentation for the same. Can someone tell me what that means?

$.ajax({
                 url: url,
                 data: FormData1,
                 cache: !1,
                 contentType: !1,
                 processData: !1,
                 type: 'POST',
                 beforeSend: function() {},
                 complete: function(responseData){
    
                }
              });

Answer 1

contentType is the type of data you're sending, so application/json; charset=utf-8 is a common one, as is application/x-www-form-urlencoded; charset=UTF-8, which is the default.

dataType is what you're expecting back from the server: json, html, text, etc. jQuery will use this to figure out how to populate the success function's parameter.