31 lines
815 B
HTML
31 lines
815 B
HTML
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<!DOCTYPE html>
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<html lang="zh">
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<head>
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<meta charset="UTF-8" />
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<meta http-equiv="X-UA-Compatible" content="IE=edge" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<link rel="stylesheet" href="" />
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<title>判断是否是闰年</title>
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</head>
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<body>
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<h1>判断是否是闰年</h1>
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<h2>作者：赵海洋</h2>
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<input type="text" id="year" placeholder="输入年份" />
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<button onclick="check()">运行</button>
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<script>
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// 判断是否是闰年
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function isleap(y) {
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return (y % 100 !== 0 && y % 4 === 0) || y % 400 === 0;
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}
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function check() {
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if (isleap(year.value)) {
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alert("是闰年");
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} else {
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alert("不是闰年");
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}
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}
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</script>
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</body>
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</html>
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