还是啥

• 坚实的比较多
  ```
  var date = new Date();
  var time = 7200 - date.getMinutes() * 60 - date.getSeconds();

countTime(time)

function countTime(time) {
var timer = null;
if (time > 0) {

  timer = setInterval(function () {
    var h = Math.floor(time / 3600);
    var m = Math.floor((time / 60)) - h * 60;
    var s = time % 3600 - m * 60;


    time--;
  }, 1000)
} else {
  time = null;
}

}
```