基于HTML实现2023年倒计时

代码实现

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>2023倒计时</title>
<!-- <link rel="stylesheet" href="style.css"> -->
<style>
  /* 公共基础样式 */
  #clockdiv{
    width: 300px;
    height: 300px;
    background-color: #14274F;
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 50px;
  }
  /* 凸起效果样式 */
  #demo1 {
    border-left: 1px solid #33B8EC;
    border-top: 1px solid #33B8EC;
    border-right: 3px solid #000;
    border-bottom: 3px solid #000;
    color: #ffffff;
    
  }

</style>
</head>
<body>

<div id="clockdiv">
  <div id="demo1">
    <div>
      <div >距离2023年元旦还有</div>
    </div>
    <div>
      <span class="days">0</span>
      <div class="smalltext">天</div>
    </div>
    <div>
      <span class="hours">0</span>
      <div class="smalltext">小时</div>
    </div>
    <div>
      <span class="minutes">0</span>
      <div class="smalltext">分</div>
    </div>
    <div>
      <span class="seconds">0</span>
      <div class="smalltext">秒</div>
    </div>
  </div>

</div>

<script>
// 设定结束时间
var deadline = new Date("2023-01-01 00:00:00").getTime();

// 每秒更新倒计时
var x = setInterval(function() {
  // 获取当前时间
  var now = new Date().getTime();
  // 计算时间差
  var t = deadline - now;
  // 计算天、小时、分钟、秒
  var days = Math.floor(t / (1000 * 60 * 60 * 24));
  var hours = Math.floor((t % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
  var minutes = Math.floor((t % (1000 * 60 * 60)) / (1000 * 60));
  var seconds = Math.floor((t % (1000 * 60)) / 1000);
  // 显示倒计时
  document.getElementsByClassName("days")[0].innerHTML = days;
  document.getElementsByClassName("hours")[0].innerHTML = hours;
  document.getElementsByClassName("minutes")[0].innerHTML = minutes;
  document.getElementsByClassName("seconds")[0].innerHTML = seconds;
  // 如果结束时间到了，停止倒计时
  if (t < 0) {
    clearInterval(x);
    document.getElementById("clockdiv").innerHTML = "倒计时结束";
  }
}, 1000);
</script>

</body>
</html>