倒计时

html

<h4><span class="minute"></span> : <span class="second"></span></h4>

script

$(function(){
	 
	/* 倒计时 */
	var ms ='14:59';
	var min = ms.split(":")[0], num =ms.split(":")[1], timer;
	if(min<10){
		$(".minute").html("0"+min);
	}else{
		$(".minute").html(min);
	}
	if(num<10){
		$(".second").html("0"+num);
	}else{
		$(".second").html(num);
	}

	timer = setInterval(function() {
		if (min == 0 && num == 0) {
			clearInterval(timer)
			return;
		}
		if (num > 0) {
			num = num - 1;
			curnum = num;
			if(num<10){
				$(".second").html("0"+curnum);	
			}else{
				$(".second").html(curnum);	
			}
		} else {
			if (num == 0) {
				num = 59;
				$(".second").html(num);
			}
			min = min - 1;
			curmin = min;
			if(min<10){
				$(".minute").html("0"+curmin);	
			}else{
				$(".minute").html(curmin);
			}
		
			
		}
		
	}, 1000);
	/* 倒计时 */
})