Using the label parameter:
Press F12 on your keyboard to view the result in the console view.
Time the number of milliseconds it takes to perform a for-loop a hundred thousand times.
<!DOCTYPE html> <html> <body> <script> var i;//ww w.j a v a 2 s . c o m console.time("test1"); for (i = 0; i < 100000; i++) { // some code } console.timeEnd("test1"); </script> </body> </html>