var data = $('#myForm').serializeArray();
data.push({name: 'tienn2t', value: 'love'});
$.ajax({
type: "POST",
url: "your url.php",
data: data,
dataType: "json",
success: function(data) {
//var obj = jQuery.parseJSON(data); if the dataType is not specified as json uncomment this
// do what ever you want with the server response
},
error: function() {
alert('error handing here');
}
});