Jquery post data sample

function postData() {
  $.ajax("/services/users/login", {
    type: "POST",
    cache:false,
    dataType: 'json',
    contentType: 'application/json; charset=utf-8',
    data: JSON.stringify({ userName : 'thebapi@gmail.com'}),
    success: function (msg) {
      alert(msg);
    },
    error: function (resp){
      var responseObj = JSON.parse(resp.responseText);
      responseObj.message && alert( responseObj.message );
    }

  });

}