javascript实现倒计时（精确到秒）_javascript技巧

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var time_end = $('#end_time_gou').val();
var time_now_server = $('#now_gou').val();
countDown(time_end,time_now_server,"#demo01 .day","#demo01 .hour","#demo01 .minute","#demo01 .second");
function countDown(endtime,now,day_elem,hour_elem,minute_elem,second_elem){
var end_time = new Date(endtime).getTime(),//月份是实际月份-1
current_time = new Date(now).getTime(),
sys_second = (end_time-current_time)/1000;
var timer = setInterval(function(){
if (sys_second > 0) {
sys_second -= 1;
var day = Math.floor((sys_second / 3600) / 24);
var hour = Math.floor((sys_second / 3600) % 24);
var minute = Math.floor((sys_second / 60) % 60);
var second = Math.floor(sys_second % 60);
day_elem && $(day_elem).text(day);//计算天
$(hour_elem).text(hour<10?"0"+hour:hour);//计算小时
$(minute_elem).text(minute<10?"0"+minute:minute);//计算分
$(second_elem).text(second<10?"0"+second:second);// 计算秒
} else {
clearInterval(timer);
}
}, 1000);
}