25 lines
782 B
HTML
25 lines
782 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 name="viewport" ,content="width=device-width, initial-scale=1.0" />
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<link rel="shortcut icon" href="data:" type="image/x-icon" />
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<title>判断闰年</title>
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</head>
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<body>
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<input type="text" id="year" placeholder="输入按回车" />
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<p id="result"></p>
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<script>
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document.addEventListener('keyup', (e) => {
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if (e.key == 'Enter' && year.value.match(/^[1-9]\d*/)) {
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const Y = Number(year.value)
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const N = Y % 400 == 0 || Y % 100 && Y % 4 == 0 ? '' : '不'
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result.innerText = `${Y}是${N}闰年`
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year.value = '' //把格子清空。
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year.focus() // 把光标移格子里。
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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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