{"id":138015,"date":"2020-07-21T11:41:07","date_gmt":"2020-07-21T03:41:07","guid":{"rendered":"http:\/\/4563.org\/?p=138015"},"modified":"2020-07-21T11:41:07","modified_gmt":"2020-07-21T03:41:07","slug":"%e4%b8%80%e9%81%93%e6%80%80%e7%96%91%e4%ba%ba%e7%94%9f%e7%9a%84%e7%ae%97%e6%b3%95%e9%a2%98%ef%bc%8c%e5%b0%b1%e8%bf%99%ef%bc%9f-2","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=138015","title":{"rendered":"\u4e00\u9053\u6000\u7591\u4eba\u751f\u7684\u7b97\u6cd5\u9898\uff0c\u5c31\u8fd9\uff1f"},"content":{"rendered":"
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\u4e00\u9053\u6000\u7591\u4eba\u751f\u7684\u7b97\u6cd5\u9898\uff0c\u5c31\u8fd9\uff1f <\/h1>\n

<\/p>\n

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\u8cc7\u6df1\u5927\u4f6c : YadongZhang <\/span> <\/i> 4<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

1234567890 -> ‘1,234,567,890’<\/p>\n

P.S. \u8003\u8651\u517c\u5bb9\u6027\u548c\u6027\u80fd\u95ee\u9898<\/p>\n

\n

\u6211\u5199\u7684\u4ee3\u7801\uff1a<\/p>\n<\/blockquote>\n

function numToStr(num) {  \/\/ STEP 1: type conversion    let tempStr = String(num)   \/\/ STEP 2: modular -> 3    let m = tempStr.length % 3   \/\/ STEP 3: slice -> '1 | 234567890'    let part1 = `${tempStr.slice(0, m)},`  let tempPart2 = tempStr.slice(m), part2 = ''   \/\/ STEP 4: split -> '234,567,890'    for (let i = 0; i < tempPart2.length; i++) {   if (i > 0 && i % 3 === 0) {    part2 += ','   }   part2 += tempPart2.charAt(i)  }   \/\/ STEP 5: combine -> '1,234,567,890'    let str = part1 + part2   return str }  const number = 1234567890 numToStr(number) \/\/ '1,234,567,890' <\/code><\/pre>\n
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\u4e13\u4e1a\u7a0b\u5e8f\u5458\u7684\u89e3\u6cd5<\/p>\n<\/blockquote>\n
function numberWithCommas(x) {     return x.toString().replace(\/B(?=(d{3})+(?!d))\/g, \",\"); } <\/code><\/pre>\n<\/p><\/div>\n
 \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (24<\/span>)        <\/div>\n
 <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
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     \u8cc7\u6df1\u5927\u4f6c : seki <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u8fd9\u79cd\u9898\u4e0d\u7528\u60f3\u592a\u591a\uff0c\u5dee\u4e0d\u591a\u548c\u8334\u7684\u51e0\u79cd\u5199\u6cd5\u4e00\u6837\uff0c\u89c1\u8fc7\u7684\u7528\u8fc7\u7684\u5c31\u80fd\u60f3\u5230\u3002\u4e0d\u8fc7\u53cd\u6b63\u81f3\u5c11\u4f60\u4e5f\u5b66\u5230\u4e86\uff0c\u4e0d\u4e8f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : zhouyg <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u5e38\u89c4\u64cd\u4f5c                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : JeffGe <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 function numberWithCommas(x) {
     return x.toString().split(”)
     .map((s, i, arr) => (arr.length – i – 3) % 3 == 1 ? s + ‘,’ : s)
     .join(”);
    }<\/p>\n
    \u4f1a\u6b63\u5219\u8fd8\u662f\u5389\u5bb3                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : yuzo555 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 number_format(1234567890)<\/p>\n
    \u8fd9\u65f6\u5019\u5c31\u4f53\u73b0\u51fa PHP \u7684\u5f00\u53d1\u6548\u7387\u4e86                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : Kaciras <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u8fd9\u79cd\u9898\u4f60\u4e0d\u77e5\u9053\u73af\u89c6\u80af\u5b9a\u53ea\u80fd\u5faa\u73af\u3002<\/p>\n
    \u5176\u5b9e\u5f88\u591a\u6b63\u5219\u6559\u7a0b\u90fd\u628a\u8fd9\u9898\u5f53\u4f8b\u5b50\u8bb2\u7684\u3002                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : rabbbit <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 console.log((1234567890).toLocaleString());                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : yhxx <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u8ba9\u4f60\u66f4\u6000\u7591\u4eba\u751f\u7684\uff1a<\/p>\n
    const num = 1234567890;
    console.log(num.toLocaleString());                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : YadongZhang <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @seki #1 \u7b97\u6cd5\u8003\u7684\u90fd\u662f\u6ca1\u89c1\u8fc7\u7684\u624d\u80fd\u4f53\u73b0\u51fa\u6c34\u5e73\uff0c\u54c8\u54c8<\/p>\n
    @JeffGe #3 \u5f3a\uff0c\u5b66\u5230\u4e86<\/p>\n
    @Kaciras #5 \u6b63\u5219\u57fa\u672c\u4e0d\u4f1a<\/p>\n
    @rabbbit #6
    @yhxx #7 \u6ce8\u610f\u517c\u5bb9\u6027\u548c\u6027\u80fd\u95ee\u9898\uff0c\u4e0d\u8fc7\u6211\u662f\u771f\u6ca1\u60f3\u5230                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : seki <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @YadongZhang \u8fd9\u9898\u76ee\u5176\u5b9e\u90fd\u4e5f\u8c08\u4e0d\u5230\u4ec0\u4e48\u7b97\u6cd5\u6280\u5de7\uff0c\u6b63\u5f0f\u7b97\u6cd5\u9898\u90fd\u4e0d\u9760\u8fd9\u79cd\u300c\u554a\u54c8\u54c8\u80fd\u7528\u6b63\u5219\u6765\u4e00\u884c\u641e\u5b9a\u300d\u7684\u4e1c\u897f\u6765\u4f53\u73b0\u6c34\u5e73\u7684                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : YadongZhang <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @seki \u53ef\u80fd\u9762\u8bd5\u5b98\u6839\u636e\u6211\u7684\u6c34\u5e73\u51fa\u7684\u3002\u3002\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : baka <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u6bd5\u7adf\u662f\u7b97\u6cd5\u9898\uff0c\u672c\u6765\u6b63\u7ecf O(n)\u5c31\u80fd\u89e3\u51b3\u3002\u6b63\u5219 NFA \u5339\u914d\u9700\u8981 O(nm)\uff0cDFA \u6784\u9020\u9700\u8981 O(2^n)\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : xiadong1994 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u7528\u6b63\u5219\u8fd8\u53eb\u8003\u8651\u6027\u80fd\uff1f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : billlee <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u6211\u600e\u4e48\u6000\u7591\u8fd9\u4e2a\u6b63\u5219\u6027\u80fd\u53ef\u80fd\u6bd4\u624b\u5199\u7684\u8fd8\u5dee                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : also24 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @rabbbit #6 
    @yhxx #7 
    \u4f60\u4eec\u8fd9\u4e2a\u65b9\u6cd5\u5c31\u9700\u8981\u8003\u8651\u517c\u5bb9\u6027\u95ee\u9898\u4e86\uff0c\u6700\u597d\u52a0\u4e2a locales \u53c2\u6570\u6307\u5b9a\u4e00\u4e0b\u8bed\u8a00\uff08\u683c\u5f0f\uff09\uff0c\u4e0d\u7136\u5bb9\u6613\u51fa\u73b0\u5176\u5b83\u7ed3\u679c\u3002
    \u53c2\u89c1\uff1a https:\/\/developer.mozilla.org\/zh-CN\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Number\/toLocaleString<\/p>\n
    \u987a\u4fbf\u8bf4\u4e00\u53e5\uff0c4  @yuzo555 \u7528 php \u7684\u5185\u7f6e\u7684 number_format \u5c31\u6ca1\u95ee\u9898\uff0c\u56e0\u4e3a\u90a3\u4e2a\u65b9\u6cd5\u4e0d\u8bba\u4ec0\u4e48\u533a\u57df\uff0c\u90fd\u662f\u6309\u7167 \u5343\u5206\u4f4d\uff0c\u52a0 “,” \u6765\u5904\u7406\u7684\uff0c\u4e0d\u8fc7\u9700\u8981\u6ce8\u610f\u7684\u662f\u9ed8\u8ba4\u662f\u4e0d\u7ba1\u5c0f\u6570\u90e8\u5206\u7684\u3002
    \u53c2\u89c1\uff1a https:\/\/www.php.net\/manual\/en\/function.number-format.php                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : seki <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @YadongZhang \u6211\u5012\u6ca1\u6709\u8fd9\u4e2a\u610f\u601d\u3002\u5c31\u662f\u63d0\u9192\u4f60\u5237\u7b97\u6cd5\u9898\u7684\u8bdd\u4e0d\u7528\u592a\u7ea0\u7ed3\u4e8e\u8fd9\u79cd\u7c7b\u578b\u7684\u9898\uff0c\u628a\u90a3\u4e9b\u57fa\u672c\u9898\u578b\u638c\u63e1\u597d\u66f4\u91cd\u8981\u3002\u6c34\u5e73\u4e4b\u7c7b\u7684\u60f3\u6cd5\u4e5f\u4e0d\u7528\u592a\u591a\uff0c\u8bf4\u4e0d\u5b9a\u9762\u8bd5\u5b98\u5c31\u662f\u6b63\u597d\u9898\u5e93\u91cc\u9762\u6709\u8fd9\u4e48\u4e00\u9053\u9898\u3002<\/p>\n
    \u5f53\u7136\u8fd9\u79cd\u9898\u5c31\u7b97\u662f\u4e0d\u7528\u6b63\u5219\u7684\u5199\u6cd5\uff0c\u4e5f\u662f\u6709\u5f88\u591a\u79cd\u89e3\u7b54\u7684\uff0c\u8fd9\u4e2a\u662f\u53ef\u4ee5\u81ea\u5df1\u7422\u78e8\uff0c\u6539\u8fdb\u4ee3\u7801\u98ce\u683c\u7684                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : yanguango <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4e0d\u7528\u8003\u8651\u56fd\u9645\u5316\u7684\u5417\uff0c\u6709\u4e9b\u56fd\u5bb6\u5c31\u4e0d\u662f\u7528\u9017\u53f7\u7684\u3002\u5982\u679c\u662f JS \u5c31\u7528 toLocaleString                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : cmqwan <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u8981\u5199\u6b63\u5219\u65f6\uff0c\u4e00\u822c\u5bf9\u7740\u767e\u5ea6\u767e\u79d1\u91cc\u9762\u5230\u5e95\u8bed\u6cd5\u5199                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : ytmsdy <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u5927\u5144\u5f1f\uff0c\u8fd9\u4e0d\u53eb\u7b97\u6cd5\u9898\u3002
    \u5728 acm \u91cc\u9762\u8fd9\u73a9\u610f\u513f\u53eb\u6a21\u62df\u9898\uff0c\u57fa\u672c\u4e0a\u5c5e\u4e8e\u767d\u9001\u7684\u7c7b\u578b\uff01                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : ZehaiZhang <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u5bf9\u7740\u8c37\u6b4c\u5199\u6b63\u5219+1
    \u53e6\u5916\u8fd9\u9898\u76ee\u4e5f\u4e0d\u7b97\u662f\u7b97\u6cd5                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : zy445566 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u6b63\u5219\u6027\u80fd\u672a\u5fc5\u5c31\u6709\u624b\u5199\u5f97\u597d\uff0cleetcode \u5c31\u6709\u5f88\u591a\u6b63\u5219\u8fc7\u4e0d\u53bb\uff0c\u624b\u5199\u59a5\u59a5\u7684\u9898                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : zoeliu <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u6b63\u5219\u8868\u8fbe\u5f0f\u6027\u80fd\u5f88\u5dee\uff0c\u8fd9\u4e24\u79cd\u4e5f\u4e0d\u7b97\u4ec0\u4e48\u662f\u5426\u4e13\u4e1a\u7684\u5dee\u8ddd\u3002
    \u53ef\u4ee5\u4e13\u95e8\u5b66\u4e00\u4e0b\u6b63\u5219\uff0c\u4f46\u4e0d\u9700\u8981\u5168\u90e8\u8bb0\u4f4f\uff0c\u7528\u7684\u65f6\u5019\u80fd\u67e5\u80fd\u7528\u5373\u53ef\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : YadongZhang <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @baka #11 \u5927\u4f6c\u5927\u4f6c\uff0cKMP \u91cc\u770b\u5230 DFA \u5b8c\u5168\u4e0d\u61c2\uff0c\u7fa1\u6155\u5bf9\u7b97\u6cd5\u638c\u63e1\u8fd9\u4e48\u6df1\u7684
    @seki #15 \u81ea\u5df1\u83dc\u54b1\u5f97\u627f\u8ba4\uff0c\u5176\u5b9e\u5f88\u5c11\u6709\u4eba\u8bf4\u771f\u8bdd\u7684\uff0c\u542c\u70b9\u771f\u8bdd\u8fdb\u6b65\u5feb
    @ytmsdy #18 \u6211\u8fd9\u667a\u5546\u8ddf ACM \u65e0\u7f18\uff0c\u80fd\u505a\u4e2a\u6a21\u62df\u9898\u5df2\u7ecf\u5f88\u6210\u529f\u4e86                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : Messiahhh <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u96f6\u5bbd\u65ad\u8a00\u8868\u793a\u4e00\u4e2a\u4f4d\u7f6e\uff0cover                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : YadongZhang <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @Messiahhh #23 \u542c\u90fd\u6ca1\u542c\u8fc7\uff0cover                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"
    \u4e00\u9053\u6000\u7591\u4eba\u751f\u7684\u7b97\u6cd5\u9898\uff0c\u5c31\u8fd9\uff1f \u8cc7\u6df1…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/138015"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=138015"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/138015\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=138015"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=138015"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=138015"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}