jquery ajax post example

jqueryajax.post.js

 $(document).ready(function (){
     $('#btn-send').click(function countdown(){
          var phoneNumber = $('#phone').val()
          $.ajax({
               method: "POST",
               url: "/getcode",
               data: JSON.stringify({"number":phoneNumber},null,4),
               contentType:'application/json;charset=UTF-8'
              })
 30     });
 31 });