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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+ <style>
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+ span {
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+ color: red;
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+ }
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+ h1 {
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+ width: 700px;
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+ height: 180px;
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+ line-height: 180px;
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+ margin: 100px auto;
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+ text-align: center;
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+ border: 4px solid purple;
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+ }
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+ </style>
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+</head>
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+<body>
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+ <h1>
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+ 倒计时：<span>0</span>天<span>0</span>时<span>0</span>分<span>0</span>秒
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+ </h1>
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+ <script>
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+ // var a = 3.6;
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+ // var x = new Number()
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+ // parseInt() 取整
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+ // parseFloat() 取浮点数
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+ // console.log(parseFloat(a));
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+ function showTime() {
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+ var spans = document.querySelectorAll("span");
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+ var startTime = new Date().getTime();
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+ var endTime = new Date("2024-06-30 12:00:00").getTime();
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+ var diffTime = (endTime - startTime) / 1000;
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+ var day = parseInt(diffTime / 60 / 60 / 24);
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+ var hour = parseInt(diffTime / 60 / 60 % 24);
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+ var minutes = parseInt(diffTime / 60 % 60);
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+ var second = parseInt(diffTime % 60) ;
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+ spans[0].innerHTML = day;
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+ spans[1].innerHTML = hour;
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+ spans[2].innerHTML = minutes;
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+ spans[3].innerHTML = second;
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+ }
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+ setInterval(showTime,1000)
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+ </script>
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+</body>
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+</html>
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