Implement a rule in javascript if user clicks cancel on prompt

Thanks Dan!

I am doing this in myCript page.

I have a prompt:

var description= prompt("Enter a brief description of the work done in this session: ", "");

if the user cancels within the prompt window then don't want to run the code. I tried putting the if statement but it does not seem to work:

See in bold what I added

(function(){
  var dbid = "bnqepesti";
  var dbidTable = dbid;
  var apptoken = "my app token";
  $.ajaxSetup({data: {apptoken: apptoken}});
  var description= prompt("Enter a brief description of the work done in this session: ", "");
  if(confirm("Do you want to continue?")) {
  var promise = $.get(dbidTable, {
    act: "API_EditRecord",
    rid: QBU_rid,
   _fid_20: description,
    _fid_6: "Out"
  }).then(function(xml) {
    console.dirxml(xml);
 $.get() & location.reload(true);
  });
})();}