Date 日期对象

1.  Date.now()    H5新增的获取总的毫秒数（时间戳）

 

2.倒计时

 function countDown(time) {
      let nowTime = Date.now(); //获取当前时间戳
      let inputTime = +new Date(time); //获取用户输入的时间戳
      let times = (inputTime - nowTime) / 1000; //剩余时间总的秒数
      console.log(times);
      let d = parseInt(times / 60 / 60 / 24); //天
      d = d < 10 ? "0" + d : d;
      let h = parseInt((times / 60 / 60) % 24); //时
      h = h < 10 ? "0" + h : h;
      let m = parseInt((times / 60) % 60); //分
      m = m < 10 ? "0" + m : m;
      let s = parseInt(times % 60); //秒
      s = s < 10 ? "0" + s : s;
      return `${d}天${h}时${m}分${s}秒`;
    }
    console.log(countDown("2022-7-3 24:00:00"));