function onOpen() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var menuEntries =[];
menuEntries.push({name: "1. dupliquer feuille Active", functionName: "simpleduplicatesheet"});
menuEntries.push(null);
menuEntries.push({name: "2. supprimer feuille Active", functionName: "supprimersheet"});
ss.addMenu("🎁menuProf🎁", menuEntries); 
}


function simpleduplicatesheet(){
var ss = SpreadsheetApp.getActiveSpreadsheet(); 
  sheet = ss.getActiveSheet();
  for (var i=1 ;i<=31;i++){
  sheet2 = sheet.copyTo(ss).setName(i); 
}
}

function supprimersheet(){
var classeur = SpreadsheetApp.getActiveSpreadsheet(); 
var ss = SpreadsheetApp.getActive();
 var nb =  classeur.getNumSheets();
 var  feuilles = classeur.getSheets();
  for (var i=1 ;i<nb;i++){
 var sheet= feuilles[i].activate();
if(feuilles[i].getName()=== ss.getSheetByName(i));
{ss.deleteSheet(sheet)};
}
}