Modificare il codice:
Vedi Risultato »
Prova tu stesso - ©
w3ii.com
<!DOCTYPE html> <html> <body> <p>Click the button to extract the first character from the string.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var str = "Hello world!"; var res = str.substring(0, 1); document.getElementById("demo").innerHTML = res; } </script> </body> </html>