Modificare il codice:
Vedi Risultato »
Prova tu stesso - ©
w3ii.com
<!DOCTYPE html> <html> <body> <p>Both the value, and the data type, of a variable with no value is <b>undefined</b>.</p> <p id="demo"></p> <script> var person; document.getElementById("demo").innerHTML = person + "<br>" + typeof person; </script> </body> </html>