... 135 How the Book of JavaScript Tip Box Works The Book of JavaScript website has a little textarea that shows various programming tips The script keeps these tips in an array and then uses JavaScript ... Start the Clock button and ends when the visitor clicks the Stop the Clock button, which cancels the most recently set time-out How the Book of JavaScript Website’s Timer Works The timer on the Book ... it’s the same as on the Space.com page The next line of the countdown() function uses the getTime() method of the Date object to calculate the number of seconds between the current time and the...