ajax-php适用于localhost但不适用于realhost

This code works on localhost but not on real, chrome developer tools showing that value is send, and Status Code:200 OK. but that value is not reaching php page. On mozilla developer tools saying that json.PARSE:unexpected none-whitespace. But there is nothing before and after like text or whitespace. All my files in the same folder.This code works on localhost but not on real, c