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31 lines
877 B
31 lines
877 B
function isQuality(n) {
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let m = Math.floor(n / 2) + 1
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for (var i = 2; i < m; i++) {
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if (n % i == 0) {
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return false
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}
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}
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return true
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}
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function checkNaturalnumber(obj) {
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return (/^[0-9]+$/.test(obj) && (obj > 0))
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}
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function handleInputChange() {
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var a = document.querySelector("input[type='text']")
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var r = document.getElementById("check-result")
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if (!a.value) {
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r.innerText = '未输入内容'
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} else if (a.value.length > 10) {
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r.innerText = '输入内容过长'
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} else if (!checkNaturalnumber(a.value)) {
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r.innerText = '输入内容不合法，请输入自然数！'
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} else {
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r.innerText = `${a.value} ${isQuality(a.value) ? '是' : '不是'}质数`
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if (a.value == 1) {
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r.innerText += `\n任何大于1的整数均可被表示成一串唯一素数之乘积。为了确保该定理的唯一性，1被定义为不是素数。——Wiki`
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}
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}
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}
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