javascript - jsonp and callback function name -

after reading jsonp explained still have questions.

1) happens if don't supply callback function name, supply ?callback=? ?

2) happens if supply callback function name, don't have function same name declared in code ?

thanks

jquery replace ? char callback function name. name must function name in response make jsonp request working.

$.getjson('url/?callback=?').success(function(response){     // process response data; });

wil call e.g.

http://url/?callback=jquery325412324_2343224

then server need send callback like

jquery325412324_2343224(['json_data'])

Bradly