Chrome storage,storage.set message not recognized?

Question

JavaScript

Plz tell me what is the problem?

document.getElementById('change').addEventListener('click', function() {
 
 over_lol =(document.getElementById('lo').value)
 lol = document.getElementById('lol').value
 check_lol = document.getElementById('lol_check').value
 
 if (lol != '' && check_lol != '')
 { 
if ( lol == check_lol) {
 var p = hex_md5(lol);
 
 chrome.storage.local.set({over_lol: p },
     function () {

     // message('Settings saved');

     })
}
 //else{ alert('Данные не совпадают')}

 else{ alert('Введите данные')}
 
}

 });

I see this error:

Error in response to storage.set: ReferenceError: message is not defined
at Object.callback (chrome-extension://kdlbhffehlpefpcfepfeancilanfcmgn/avt.js:22:7)
at HTMLInputElement. (chrome-extension://kdlbhffehlpefpcfepfeancilanfcmgn/avt.js:19:23)

Tell me how to treat plz

Answer 1

Well, first of all - to explain what message is and where an object with such a name is described. There is a risk that at the moment your handler is triggered, it really does not exist or it is not visible in scopes.

Answer 2

What is the purpose of declared global variables? Maybe you should first declare them through var?