直播源码开发，前端js实现时间倒计时，天，时，分，秒

<!DOCTYPE html><br><html><br><head><br>  <meta charset="UTF-8"><br>  <meta http-equiv="X-UA-Compatible" content="IE=edge"><br>  <meta name="viewport" content="width=device-width, initial-scale=1.0"><br>  <title>倒计时</title><br>  <style><br>    .box {<br>      display: flex;<br>      line-height: 50px;<br>      font-size: 30px;<br>    }<br>    .box div {<br>      height: 50px;<br>      text-align: center;<br>      margin: 0 10px;<br>    }<br>  </style><br></head><br><body><br>  <div><br>    <div>08</div>天<br>    <div>23</div>时<br>    <div>59</div>分<br>    <div>32</div>秒<br>  </div><br>  <script><br>    function countdown(dateEnd) {<br>      const subsidies = (count) => count > 0 ? (count > 9 ? count.toString() : '0' + count) : '00'<br>      let result = new Date(dateEnd).getTime() - new Date().getTime()<br>      result = parseInt(result / 1000)<br>      let d = subsidies(Math.floor(result / (60 * 60 * 24)))<br>      let h = subsidies(Math.floor(result / (60 * 60 * 1) % 24))<br>      let m = subsidies(Math.floor(result / (60 * 1) % 60))<br>      let s = subsidies(Math.floor(result % 60))<br>      return { d, h, m, s }<br>    }<br>    <br>    setInterval(() => {<br>      showCountdown()<br>    }, 1000);<br>    showCountdown()<br>    function showCountdown(){<br>      let divs = document.querySelectorAll('.box div')<br>      let date = countdown('2023-1-21 00:00:00')<br>      divs[0].innerText = date.d<br>      divs[1].innerText = date.h<br>      divs[2].innerText = date.m<br>      divs[3].innerText = date.s<br>    }<br>  </script><br></body><br></html>