below are my code

$.getJSON("http://mydomain.com/phptest.php?jsoncallback=?",function(data)
{
 alert(data.a);
});

 

phptest.php echos out the following

 

{"a":"hello world"}

 

Yet, when i made the json calls(cross domain), it just return me nothing. However, under the same domain, I got the pop-up alert and return me the relevant data. But getJSON is suppose to be feasible across all domains irrespective of the same-origin policy. Please help.