话不多说，直接上代码：
有需要直接拿走，
<html> <head> <style> div{ width:100%; text-align:center; font-size: 14px; } </style> </head> <div id="go"> </div> <body> <script> function countTime(time,id) { var date = new Date(); var now = date.getTime(); var endDate = new Date(time);//设置截止时间 var end = endDate.getTime(); var leftTime = end - now; //时间差 var d, h, m, s, ms; if(leftTime >= 0) { d = Math.floor(leftTime / 1000 / 60 / 60 / 24); h = Math.floor(leftTime / 1000 / 60 / 60 % 24); m = Math.floor(leftTime / 1000 / 60 % 60); s = Math.floor(leftTime / 1000 % 60); ms = Math.floor(leftTime % 1000); if(ms < 100) { ms = "0" + ms; } if(s < 10) { s = "0" + s; } if(m < 10) { m = "0" + m; } if(h < 10) { h = "0" + h; } //将倒计时赋值到div中 document.getElementById(id).innerHTML = d + "天" + h + "时" + m + "分" + s + "秒"+ ms + "毫秒"; } else { console.log('已截止') //将倒计时赋值到div中 document.getElementById(id).innerHTML = "已开抢" } //递归每秒调用countTime方法，显示动态时间效果 return leftTime } //调用方式 需要传入 结束时间 和 倒计时内容所在的id名称 var s = setInterval(function (){ var dates = countTime("2019-7-2 10:32:00", "go"); if(dates<=0) { clearInterval(s) } },50) </script> </body> </html>