41 lines
1.6 KiB
HTML
41 lines
1.6 KiB
HTML
<!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="../style/common.css" />
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<title>判断是否是闰年</title>
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</script></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()">判断</button>
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<script>
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// 判断是否是闰年
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function isleap(year) {
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if (year == 0) return '没有公元0年'
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if (year < 0) return '不支持公元前的年份'
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if (!year.match(/\d+/)) return '年份格式不正确'
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if (!year.match(/\d+/)) return ''
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return (
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(year / 4 == Math.floor(year / 4) && year / 100 != Math.floor(year / 100)) ||
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(year / 400 == Math.floor(year / 400) && year / 3200 != Math.floor(year / 3200)) ||
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year / 172800 == Math.floor(year / 172800)
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)
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}
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function check() {
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let result = isleap(year.value)
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if (result === true) {
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alert('是闰年')
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} else if (result === false) {
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alert('不是闰年')
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} else {
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alert(result)
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}
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}
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</script>
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</body>
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</html> |