var count = 0;var timer;var timerOn = false;function timedCount() { count++; timer = setTimeout(function(){timedCount() }, 1000);}function doTimer() { if (!timerOn) {timerOn = true;timedCount(); }}function stopCount() { clearTimeout(timer); timerOn = false;}希望本文所述对大家的javascript程序设计有所帮助。