我正在制作一個 Google 表格，用于跟蹤打卡時間。我想添加一個列 e，它將計算給定開始時間（c 列）和結束時間（d 列）的工作小時數。我該如何實施呢？這是我的代碼：function setValue(cellName, value){  SpreadsheetApp.getActiveSpreadsheet().getRange(cellName).setValue(value);}function getValue(cellName){  return SpreadsheetApp.getActiveSpreadsheet().getRange(cellName).getValue();}function getNextRow(){  return getCurrentRow() + 1;}function getCurrentRow(){  return SpreadsheetApp.getActiveSpreadsheet().getLastRow();}function addStart(a, b, c, d){  var row = getNextRow();  setValue('A' + row, a); // employee name row  setValue('B' + row, b); // date row  setValue('C' + row, c); // clock in time row}function addEnd(endTime) {  var row = getCurrentRow();  setValue('D' + row, endTime); // }function updateRow(e){  // declare row e  var row = getCurrentRow();  setValue('E' + row, e) }function punchIn(){  addStart("Faiq Ashraf", new Date(), date(), "")}function punchOut(){  addEnd(date());}function totalHours(){  // function used to update column e with our total hours worked  var total = getCurrentRow().addEnd(d) - getCurrentRow().addStart(c)  updateRow(total);}function date(){  var dd = new Date();  var currentTime = dd.toLocaleTimeString();  return currentTime}javascript谷歌應用腳本谷歌表格