< script > function startTimer ( duration, display ) { var timer = duration, minutes, seconds; setInterval ( function ( ) { minutes = parseInt (timer / 60 , 10 ); seconds = parseInt (timer % 60 , 10 ); minutes = minutes < 10 ? "0" + minutes : minutes; seconds = seconds < 10 ? "0" + seconds : seconds; display. textContent = minutes + ":" + seconds; if (--timer < 0 ) { timer = duration; }, 1000 ); window . onload = function ( ) { var fiveMinutes = 60 * 5 , display = document . querySelector ( '#time' ); startTimer (fiveMinutes, display); </ script > </ head > < p id = "time" > 05:00 </ p > </ div > </ body > </ html >
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