Fill in the blanks to check which button on the mouse was pu…

Fill in the blanks to check which button on the mouse was pushed. Assume the function has been registered as an event handler for the appropriate mouse event. function mouseHandler(e) { if (_____ == 0) { // Do something! } else if (_____ == 1) { // Do something else! } else if (_____ == 2) { // Do yet something else! } }