{"id":168371,"date":"2024-05-08T16:22:30","date_gmt":"2024-05-08T08:22:30","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/168371.html"},"modified":"2024-05-08T16:22:35","modified_gmt":"2024-05-08T08:22:35","slug":"javascript-%e6%80%8e%e4%b9%88%e5%ae%9e%e7%8e%b0%e4%b8%80%e4%b8%aa%e6%8e%92%e5%88%97%e7%bb%84%e5%90%88%e7%ae%97%e6%b3%95","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/168371.html","title":{"rendered":"JavaScript \u600e\u4e48\u5b9e\u73b0\u4e00\u4e2a\u6392\u5217\u7ec4\u5408\u7b97\u6cd5"},"content":{"rendered":"

\"JavaScript<\/p>\n

JavaScript \u5b9e\u73b0\u6392\u5217\u7ec4\u5408\u7b97\u6cd5\u53ef\u4ee5\u901a\u8fc7\u7f16\u5199\u51fd\u6570\u6765\u5b8c\u6210\uff0c\u9012\u5f52\u7b97\u6cd5<\/strong>\u3001\u56de\u6eaf\u7b97\u6cd5<\/strong>\u3001\u52a8\u6001\u89c4\u5212<\/strong>\u662f\u5e38\u7528\u7684\u5b9e\u73b0\u65b9\u5f0f\u3002\u4f8b\u5982\uff0c\u4f7f\u7528\u9012\u5f52\u7b97\u6cd5\u5b9e\u73b0\u7ec4\u5408\uff0c\u53ef\u4ee5\u8bbe\u8ba1\u4e00\u4e2a\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u63a5\u6536\u9700\u8981\u7ec4\u5408\u7684\u6570\u7ec4\uff0c\u548c\u5e0c\u671b\u9009\u62e9\u7684\u5143\u7d20\u4e2a\u6570\u3002\u5185\u90e8\u901a\u8fc7\u9012\u5f52\u8c03\u7528\u81ea\u5df1\u3001\u5bf9\u6570\u7ec4\u8fdb\u884c\u904d\u5386\uff0c\u4ee5\u6b64\u6765\u6784\u5efa\u6240\u6709\u53ef\u80fd\u7684\u7ec4\u5408\u5e76\u5c06\u5b83\u4eec\u8f93\u51fa\u6216\u8005\u5b58\u50a8\u8d77\u6765\u3002\u5176\u4e2d\uff0c\u9012\u5f52\u7b97\u6cd5\u7684\u5b9e\u73b0\u76f8\u5bf9\u7b80\u6d01\u6613\u61c2\uff0c\u7279\u522b\u662f\u5728\u5904\u7406\u8f83\u5c0f\u7684\u6570\u636e\u96c6\u65f6\u975e\u5e38\u9ad8\u6548\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u9012\u5f52\u5b9e\u73b0\u7ec4\u5408<\/h3>\n<\/p>\n

\u5728\u9012\u5f52\u5b9e\u73b0\u7ec4\u5408\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u4e00\u4e2a\u8f85\u52a9\u51fd\u6570\uff0c\u5b83\u53ef\u4ee5\u6301\u7eed\u8ddf\u8e2a\u5f53\u524d\u7684\u7ec4\u5408\u72b6\u6001\u3001\u6240\u9700\u8981\u7684\u5143\u7d20\u4e2a\u6570\u4ee5\u53ca\u5f53\u524d\u7684\u4f4d\u7f6e\u3002\u6211\u4eec\u4ece\u5927\u6570\u7ec4\u7684\u8d77\u59cb\u4f4d\u7f6e\u5f00\u59cb\uff0c\u9012\u5f52\u5730\u5411\u540e\u67e5\u627e\u6240\u6709\u53ef\u80fd\u7684\u7ec4\u5408\uff0c\u5e76\u5c06\u5b83\u4eec\u4e00\u4e00\u8bb0\u5f55\u4e0b\u6765\u3002<\/p>\n<\/p>\n

function combine(arr, k) {<\/p>\n
    const results = [];<\/p>\n
    function helper(start, prev) {<\/p>\n
        \/\/ \u5f53\u524d\u7ec4\u5408\u957f\u5ea6\u8fbe\u5230k\u65f6\uff0c\u6dfb\u52a0\u5230\u7ed3\u679c\u96c6<\/p>\n
        if (prev.length === k) {<\/p>\n
            results.push(prev);<\/p>\n
            return;<\/p>\n
        }<\/p>\n
        for (let i = start; i < arr.length; i++) {<\/p>\n
            helper(i + 1, prev.concat(arr[i]));<\/p>\n
        }<\/p>\n
    }<\/p>\n
    helper(0, []);<\/p>\n
    return results;<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7\u4e0a\u8ff0\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u751f\u6210\u4ece\u539f\u59cb\u6570\u7ec4\u4e2d\u9009\u62e9k\u4e2a\u5143\u7d20\u7684\u6240\u6709\u7ec4\u5408\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u56de\u6eaf\u5b9e\u73b0\u6392\u5217<\/h3>\n<\/p>\n
\u5f53\u5b9e\u73b0\u6392\u5217\u65f6\uff0c\u56de\u6eaf\u7b97\u6cd5\u663e\u5f97\u5c24\u4e3a\u5408\u9002\u3002\u5728\u56de\u6eaf\u7b97\u6cd5\u4e2d\uff0c\u6211\u4eec\u904d\u5386\u539f\u59cb\u6570\u7ec4\u7684\u6bcf\u4e00\u4e2a\u5143\u7d20\uff0c\u5e76\u5c06\u5176\u6dfb\u52a0\u5230\u5f53\u524d\u6392\u5217\u4e2d\uff0c\u7136\u540e\u9012\u5f52\u5730\u8fdb\u884c\u4e0b\u4e00\u6b65\u64cd\u4f5c\u3002\u5982\u679c\u4e00\u4e2a\u6392\u5217\u88ab\u5b8c\u6210\uff0c\u6211\u4eec\u5c06\u5176\u52a0\u5165\u7ed3\u679c\u96c6\uff0c\u63a5\u7740\u56de\u6eaf\u5230\u4e4b\u524d\u7684\u72b6\u6001\u4ee5\u5c1d\u8bd5\u53e6\u4e00\u4e2a\u5143\u7d20\u3002<\/p>\n<\/p>\n
function permute(arr) {<\/p>\n
    const results = [];<\/p>\n
    function backtrack(start) {<\/p>\n
        \/\/ \u5f53\u524d\u6392\u5217\u5b8c\u6210<\/p>\n
        if (start === arr.length - 1) {<\/p>\n
            results.push(arr.slice());<\/p>\n
            return;<\/p>\n
        }<\/p>\n
        for (let i = start; i < arr.length; i++) {<\/p>\n
            \/\/ \u4ea4\u6362\u5143\u7d20\uff0c\u6784\u6210\u65b0\u7684\u6392\u5217<\/p>\n
            [arr[start], arr[i]] = [arr[i], arr[start]];<\/p>\n
            \/\/ \u9012\u5f52\u586b\u5145\u4e0b\u4e00\u4e2a\u4f4d\u7f6e<\/p>\n
            backtrack(start + 1);<\/p>\n
            \/\/ \u56de\u6eaf\uff0c\u6062\u590d\u539f\u59cb\u6392\u5217<\/p>\n
            [arr[start], arr[i]] = [arr[i], arr[start]];<\/p>\n
        }<\/p>\n
    }<\/p>\n
    backtrack(0);<\/p>\n
    return results;<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e0a\u9762\u7684\u51fd\u6570\u53ef\u4ee5\u751f\u6210\u6570\u7ec4\u6240\u6709\u53ef\u80fd\u7684\u6392\u5217\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u52a8\u6001\u89c4\u5212\u6c42\u7ec4\u5408\u6570<\/h3>\n<\/p>\n
\u5f53\u9898\u76ee\u9700\u8981\u8ba1\u7b97\u7ec4\u5408\u6570\uff0c\u800c\u4e0d\u662f\u5217\u51fa\u6240\u6709\u7ec4\u5408\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u52a8\u6001\u89c4\u5212\u65b9\u6cd5\u3002\u52a8\u6001\u89c4\u5212\u901a\u8fc7\u586b\u5145\u8868\u683c\u7684\u65b9\u5f0f\uff0c\u907f\u514d\u4e86\u91cd\u590d\u7684\u8ba1\u7b97\uff0c\u6781\u5927\u5730\u63d0\u9ad8\u4e86\u6548\u7387\uff0c\u7279\u522b\u662f\u5bf9\u4e8e\u5927\u6570\u636e\u96c6\u3002<\/p>\n<\/p>\n
function combinationCount(n, k) {<\/p>\n
    let dp = Array.from({ length: n + 1 }, () => Array(k + 1).fill(0));<\/p>\n
    \/\/ \u521d\u59cb\u5316<\/p>\n
    for (let i = 0; i <= n; i++) {<\/p>\n
        dp[i][0] = 1;<\/p>\n
    }<\/p>\n
    \/\/ \u586b\u8868<\/p>\n
    for (let i = 1; i <= n; i++) {<\/p>\n
        for (let j = 1; j <= Math.min(i, k); j++) {<\/p>\n
            dp[i][j] = dp[i - 1][j - 1] + dp[i - 1][j];<\/p>\n
        }<\/p>\n
    }<\/p>\n
    return dp[n][k];<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4ee5\u4e0a\u51fd\u6570\u5c06\u8fd4\u56de\u4ecen\u4e2a\u5143\u7d20\u4e2d\u9009\u62e9k\u4e2a\u5143\u7d20\u7684\u7ec4\u5408\u6570\uff0c\u901a\u8fc7\u52a8\u6001\u89c4\u5212\u7684\u65b9\u5f0f\u6765\u907f\u514d\u91cd\u590d\u7684\u8ba1\u7b97\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
Q1: JavaScript\u4e2d\u5982\u4f55\u7f16\u5199\u4e00\u4e2a\u6392\u5217\u7b97\u6cd5\uff1f<\/strong><\/p>\n
A1: \u5b9e\u73b0\u4e00\u4e2a\u6392\u5217\u7b97\u6cd5\u9700\u8981\u4f7f\u7528\u9012\u5f52\u7684\u65b9\u5f0f\u6765\u751f\u6210\u6240\u6709\u53ef\u80fd\u7684\u6392\u5217\u3002\u53ef\u4ee5\u5c06\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u4f9d\u6b21\u4e0e\u5176\u4ed6\u5143\u7d20\u8fdb\u884c\u4ea4\u6362\uff0c\u7136\u540e\u9012\u5f52\u5730\u5bf9\u5269\u4f59\u7684\u5143\u7d20\u8fdb\u884c\u6392\u5217\u3002\u6700\u7ec8\u53ef\u4ee5\u5f97\u5230\u6240\u6709\u53ef\u80fd\u7684\u6392\u5217\u7ed3\u679c\u3002<\/p>\n
Q2: \u600e\u6837\u4f7f\u7528 JavaScript \u5b9e\u73b0\u4e00\u4e2a\u7ec4\u5408\u7b97\u6cd5\uff1f<\/strong><\/p>\n
A2: JavaScript\u4e2d\u53ef\u4ee5\u4f7f\u7528\u9012\u5f52\u6765\u5b9e\u73b0\u7ec4\u5408\u7b97\u6cd5\u3002\u4ece\u7ed9\u5b9a\u7684\u6570\u7ec4\u4e2d\u9009\u53d6k\u4e2a\u5143\u7d20\u7684\u7ec4\u5408\uff0c\u53ef\u4ee5\u901a\u8fc7\u4e0d\u65ad\u7f29\u5c0f\u95ee\u9898\u89c4\u6a21\uff0c\u4ece\u6570\u7ec4\u4e2d\u9009\u62e9\u4e00\u4e2a\u5143\u7d20\u4f5c\u4e3a\u7ec4\u5408\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20\uff0c\u7136\u540e\u5bf9\u5269\u4f59\u7684\u5143\u7d20\u8fdb\u884c\u9012\u5f52\u6c42\u89e3\uff0c\u5f97\u5230\u6240\u6709\u53ef\u80fd\u7684\u7ec4\u5408\u3002<\/p>\n
Q3: \u6709\u6ca1\u6709\u73b0\u6210\u7684 JavaScript \u5e93\u6216\u51fd\u6570\u53ef\u4ee5\u5b9e\u73b0\u6392\u5217\u7ec4\u5408\u7b97\u6cd5\u5462\uff1f<\/strong><\/p>\n
A3: \u662f\u7684\uff0cJavaScript\u793e\u533a\u4e2d\u6709\u5f88\u591a\u73b0\u6210\u7684\u5e93\u53ef\u4ee5\u5e2e\u52a9\u5b9e\u73b0\u6392\u5217\u7ec4\u5408\u7b97\u6cd5\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528lodash\u5e93\u4e2d\u7684permutation\u548ccombination\u51fd\u6570\u6765\u65b9\u4fbf\u5730\u751f\u6210\u6392\u5217\u548c\u7ec4\u5408\u3002\u6b64\u5916\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528Math.js\u5e93\u4e2d\u7684combinations\u548cpermutations\u51fd\u6570\u6765\u5b8c\u6210\u6392\u5217\u7ec4\u5408\u7684\u8ba1\u7b97\u3002\u8fd9\u4e9b\u5e93\u63d0\u4f9b\u4e86\u9ad8\u6548\u4e14\u6613\u4e8e\u4f7f\u7528\u7684\u51fd\u6570\uff0c\u80fd\u591f\u8282\u7701\u5f00\u53d1\u65f6\u95f4\u548c\u51cf\u5c11\u51fa\u9519\u7684\u53ef\u80fd\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"JavaScript \u5b9e\u73b0\u6392\u5217\u7ec4\u5408\u7b97\u6cd5\u53ef\u4ee5\u901a\u8fc7\u7f16\u5199\u51fd\u6570\u6765\u5b8c\u6210\uff0c\u9012\u5f52\u7b97\u6cd5\u3001\u56de\u6eaf\u7b97\u6cd5\u3001\u52a8\u6001\u89c4\u5212\u662f\u5e38\u7528\u7684\u5b9e\u73b0\u65b9\u5f0f\u3002\u4f8b […]","protected":false},"author":3,"featured_media":168381,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/168371"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=168371"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/168371\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/168381"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=168371"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=168371"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=168371"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}