function doGet(e) {
  //取得參數
  var params = e.parameter;
  var name = params.name;
  var phone = params.phone;
  var demand = params.demand;

  //sheet資訊
  var SpreadSheet = SpreadsheetApp.openById("請輸入自己的sheet id");
  var Sheet = SpreadSheet.getSheets()[0];
  var LastRow = Sheet.getLastRow();

  //存入資訊
  Sheet.getRange(LastRow+1, 1).setValue(name);
  Sheet.getRange(LastRow+1, 2).setValue(phone);
  Sheet.getRange(LastRow+1, 3).setValue(demand);

  //回傳資訊
  return ContentService.createTextOutput("成功");
}