js实现一个倒计时计时器写法之一

　　　　　　　　　<div id="timer">
			距离新年还有：<span></span>个月<span></span>天<span></span>小时<span></span>分<span></span>秒
		</div>
		<script src="jquery-1.11.3.min.js"></script>
		<script>
		
		var $span = $('#timer span');
		setInterval(function setTime(){
			var oDate = new Date();

			var nDate = new Date(2016,11,31,23,59,59);
			var iTime = nDate.getTime()-oDate.getTime();

			var month = nDate.getMonth()-oDate.getMonth();
			var m2 = oDate.getMonth()+1;
			var day = new Date(2016,m2,0).getDate()-oDate.getDate();
			var hour = 23-oDate.getHours()-1;
			var minute = 59-oDate.getMinutes();
			var second = 60-oDate.getSeconds();
			$span.eq(0).html(month);
			$span.eq(1).html(day);
			$span.eq(2).html(hour);
			$span.eq(3).html(minute);
			$span.eq(4).html(second);
		},1000);