提交时谷歌表单，发送电子邮件锁定不起作用

我创建了一个带有电子邮件字段的谷歌表单。响应存储在电子表格中。提交时，我从工作表（最新响应）中获取最后一行并向该用户发送电子邮件。

我

尝试实施一个锁定系统，但它也没有按照我想要的方式工作。如果快速连续有多个提交（即一分钟内 3 次），则只有最后一个用户会收到发送给他们的电子邮件，他们实际上会收到 3 封重复的电子邮件，该电子邮件数量快速连续提交。

function EmailFormConfirmation() {
// Get a public lock on this script, because we're about to modify a shared resource.
var lock = LockService.getScriptLock()
// Wait for up to 30 seconds for other processes to finish.
lock.waitLock(30000);
 try {
var sheetname = "reg-responses"
var columnnumber = 4
var ss = SpreadsheetApp.getActiveSpreadsheet(); 
var sheet = ss.getSheetByName(sheetname);
// Determines row number of most recent form submission and sets it as "lastrow"
if (sheet.getRange(sheet.getMaxRows(),1).getValue() != "") {
var lastrow = sheet.getMaxRows()
    } 
else {
  var count = 0
  for (var i = 0; i < sheet.getMaxRows(); i++) {
    if (sheet.getRange(sheet.getMaxRows()-i,1).getValue() != "") {
      var lastrow = sheet.getMaxRows()-i
      break;
    }  
  }
 }
  var email = sheet.getRange(lastrow,columnnumber).getValue();                            
  var name = sheet.getRange(lastrow,2).getValue();
  var message = "<HTML><BODY>"
    +"<h3>Your registration has been submitted</h3>"
    +"<p><b>Name</b>: "+name+"</p>"        
    +"</HTML></BODY>";      
  //validation is handled on the form as regex
 MailApp.sendEmail(email, "Form Submitted", "", {htmlBody: message}); 
 //flags it as email sent
 sheet.getRange(lastrow,8,1,1).setValue("Email Sent");
         //Here is the catch if the lock doesn't work
  if(!lock.hasLock()){
     Logger.log('Could not obtain lock after 30 seconds.');
  }
//Secondary catch for the entire function. 
} catch (e) {
Logger.log(e.toString());
}
 // Release the lock so that other processes can continue.
 lock.releaseLock();
}

我必须修复锁上的什么问题才能解决此问题？

您可以检查工作表中的所有行，而不仅仅是最后一行，如果该行没有将标志设置为"电子邮件已发送"，请发送电子邮件。

这里的问题不是锁，而是您只检查最后一行的事实。

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