jsonp cross domain

<script>
var testApi = "Address";
$.ajax({
url:testApi,//Can not be a local domain name
type:'post',
dataType:'jsonp', //Access in jsonp format
jsonpCallback:'test' //Get function of data
})
.done(function(data){
if (data.status == 1) {
console.log('success');
} else {
console.log('failed');
}
})
.fail( function() {
alert('Server timed out, please try again!');
});
</script>

php:
header('Content-type:application/json');
header('Cache-Control:no-cache,must-revalidate');
$jsonp = $_GET['callback'];
echo $jsonp . '(' . json_encode(['status' => 2]) . ')';