javascript - jQuery[number] was not called -

ok, have searched question , have found numerous answers on none have worked me. i'm getting jquery21006460414978209883_1395689439888 not called error. ajax call done right, status 200 , php url i'm trying call, have validated json , valid json according jsonlint. i'm using jsonp since crossdomain call. advise me debug this. here javascript code:

$.ajax({     crossdomain: true,     cache: false,     type: "get",     url: "http://example.com/backend.php",     data: "fdaf",     //async: false,     datatype: "jsonp",     contenttype: 'application/json; charset=utf-8',     success: function(msg){       alert("success"+ json.stringify(msg));     },     error:function (xhr, ajaxoptions, thrownerror){                 alert('error function status : '+xhr.status);                 alert('error thrown is:  '+thrownerror);     },     jsonp: "callback",     complete: function (requeststate) {         alert("working");     }  }); 

my backend.php code here:

<?php  header('content-type: application/json');  $arr = array('a' => "1", 'b' => "2", 'c' => "3", 'd' => "4"); $tr =  json_encode($arr);  echo $_get['callback'].'['.$tr.']'; ?> 

please advise doing wrong here. many thanks!

your issue this, output of php:

callbackfunction[[data]] 

this not call javascript function. should have output:

callbackfunction([data]) 

with php:

echo $_get['callback'].'('.$tr.')'; 

because $tr array return [data]

you should need jsonp if cross-domain request. otherwise use / post.