<script type="text/javascript">
$(function(){
$(".count_down").countDown({
startTimeStr:'2017/01/11 00:00:00',//开始时间
endTimeStr:'2028/01/17 23:59:59',//结束时间
daySelector:".day_num",
hourSelector:".hour_num",
minSelector:".min_num",
secSelector:".sec_num"
});
})
</script>