Tryit Editor v2.3

Edit This Code:
<!DOCTYPE html> <html> <body> <p>Counting with a local variable.</p> <p id="demo">0</p> <script> document.getElementById("demo").innerHTML = add(); function add() { var counter = 0; function plus() {counter += 1;} plus(); return counter; } </script> </body> <!-- Mirrored from www.w3schools.com/js/tryit.asp?filename=tryjs_function_counter1 by HTTrack Website Copier/3.x [XR&CO'2014], Fri, 23 Jan 2015 07:36:24 GMT --> </html>
Result:
Try it Yourself - © w3schools.com