Send Email in Google AppMaker

问题

A button won't perform following sendEmail(widget) on server script when clicked. But it also didn't show any error.

function sendEmail(record) {  

  var to = record.OwnerEmail;

  var subject = 'Contract Renewal Notice';

  var body =  'Hello!<br/><p>Please be inform that your following contract is expiring soon:\n<br/>\n</p>'+
          '<b>Contract Name</b>'+'<?= record.Name ?><br/>'+
          '<b>Contract Value</b>'+'<?= record.Currency ?>'+' '+'<?= record.ContractValue ?><br/>'+
          '<b>Contract Owner</b>'+'<?= record.OwnerName ?><br/>'+
          '<b>Vendor Name</b>'+'<?= record.VendorName ?><br/>'+
          '<a href="<?= record.FileURL ?>">Open contract document</a></br>'+
          'Please act upon it. Thank You!';

  MailApp.sendEmail(to, subject, body);
}

Did I do it correctly?

来源：https://stackoverflow.com/questions/50462355/send-email-in-google-appmaker