36 lines
1.2 KiB
HTML
36 lines
1.2 KiB
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>冰雹数列生成器</title>
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</head>
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<body>
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<h1>冰雹数列生成器</h1>
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<h2>作者: 赵海洋</h2>
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<p>
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随便想一个正整数。如果它是奇数，则把它乘以3再加1。如果它是偶数，则把它除以2。对每一个新产生的数都运用这个规则，你知道会发生什么情况吗？
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数学家猜想它们都会变成1。
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</p>
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<input type="text" id="number" placeholder="输入一个正整数" />
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<button onclick="go()">生成冰雹数列</button>
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<p><code id="seq"></code></p>
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<script>
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// 冰雹数列生成器
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function* hailstone(n) {
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yield n;
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while (n != 1) yield (n = n % 2 ? 3 * n + 1 : n / 2);
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}
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function go() {
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if (number.value.match(/^\d+$/)) {
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seq.innerText = [...hailstone(number.value)].join(", ");
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number.value = "";
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} else alert("请输入一个正整数");
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}
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</script>
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</body>
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</html>
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