倒计时 JS小例子

function leftTimer(year,month,day,hour,minute,second){ var leftTime = (new Date(year,month-1,day,hour,minute,second)) - (new Date()); //计算剩余的毫秒数 // alert(leftTime); var days = parseInt(leftTime / 1000 / 60 / 60 / 24 , 10); //计算剩余的天数 var hours = parseInt(leftTime / 1000 / 60 / 60 % 24 , 10); //计算剩余的小时 var minutes = parseInt(leftTime / 1000 / 60 % 60, 10);//计算剩余的分钟 var seconds = parseInt(leftTime / 1000 % 60, 10);//计算剩余的秒数 days = checkTime(days); hours = checkTime(hours); minutes = checkTime(minutes); seconds = checkTime(seconds); document.getElementById("days").innerHTML = days; document.getElementById("seconds").innerHTML = seconds; document.getElementById("minutes").innerHTML = minutes; document.getElementById("hours").innerHTML = hours; } function checkTime(i){ //将0-9的数字前面加上0，例1变为01 if(i<10) { i = "0" + i; } return i; } //$seckill_time = ‘2018,04,04,10,00,00‘； setInterval("leftTimer({$seckill_time})",1000); //在这里修改6个参数 ，根据后台传值 leftTimer();