注意： setInterval（）返回值必须作为clearInterval()的入参才能把定时器停了。
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
</head>
<body>
<span id="seconds"></span><span> Seconds Left</span>
<br>
<button id="restart">Restart</button>
<script type="text/javascript">
$(function(){
configDomEventHandlers();
runCountDownJob();
});
var total = 5;
var countDownJobId = null;
var configDomEventHandlers = function() {
$("#restart").click(restart);
};
var restart = function() {
total = 5;
stopCountDown();
runCountDownJob();
};
var runCountDownJob = function() {
countDownJobId = setInterval(countDownJobDetail, 1000);
};
var countDownJobDetail = function() {
if (total >= 0) {
countDown();
} else {
stopCountDown();
}
};
var countDown = function() {
$("#seconds").text(total--);
};
var stopCountDown = function() {
clearInterval(countDownJobId);
countDownJobId = null;
};
</script>
</body>
</html>
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