{"id":54557,"date":"2025-08-13T07:50:21","date_gmt":"2025-08-12T23:50:21","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/54557.html"},"modified":"2025-08-13T07:50:21","modified_gmt":"2025-08-12T23:50:21","slug":"%e7%ac%ac%e4%ba%8c%e7%ab%a0%ef%bc%9a%e6%a0%b8%e5%bf%83%e6%95%b0%e6%8d%ae%e7%bb%93%e6%9e%84%e4%b8%8e%e9%9d%a2%e5%90%91%e5%af%b9%e8%b1%a1%e6%80%9d%e6%83%b3%e4%b9%8bmap-%e5%ba%95%e5%b1%82%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/54557.html","title":{"rendered":"\u7b2c\u4e8c\u7ae0\uff1a\u6838\u5fc3\u6570\u636e\u7ed3\u6784\u4e0e\u9762\u5411\u5bf9\u8c61\u601d\u60f3\u4e4bMap \u5e95\u5c42\u89e3\u6790"},"content":{"rendered":"

\u6df1\u5165 Go \u8bed\u8a00 Map：\u4ece\u4f7f\u7528\u5230\u54c8\u5e0c\u8868\u5e95\u5c42\u63a2\u79d8<\/h3>\n

Go \u8bed\u8a00\u4e2d\u7684 map（\u6620\u5c04\u3001\u5b57\u5178\u3001\u5173\u8054\u6570\u7ec4）\u662f\u4e00\u79cd\u975e\u5e38\u5f3a\u5927\u7684\u5185\u7f6e\u6570\u636e\u7ed3\u6784，\u5b83\u63d0\u4f9b\u4e86\u952e\u503c\u5bf9\u5b58\u50a8\u7684\u80fd\u529b，\u8ba9\u6211\u4eec\u80fd\u591f\u4ee5 O(1) \u7684\u5e73\u5747\u65f6\u95f4\u590d\u6742\u5ea6\u8fdb\u884c\u67e5\u627e\u3001\u63d2\u5165\u548c\u5220\u9664\u64cd\u4f5c\u3002\u5728\u65e5\u5e38\u5f00\u53d1\u4e2d，map \u7684\u4f7f\u7528\u9891\u7387\u6781\u9ad8\u3002\u7136\u800c，\u9664\u4e86\u719f\u7ec3\u638c\u63e1\u5176\u57fa\u672c\u7528\u6cd5\u5916，\u4e86\u89e3\u5176\u5e95\u5c42\u5b9e\u73b0\u539f\u7406，\u7279\u522b\u662f\u54c8\u5e0c\u8868\u7684\u673a\u5236\u3001\u51b2\u7a81\u89e3\u51b3\u548c\u5e76\u53d1\u5b89\u5168，\u80fd\u591f\u5e2e\u52a9\u6211\u4eec\u66f4\u597d\u5730\u7406\u89e3 map \u7684\u884c\u4e3a，\u5199\u51fa\u66f4\u9ad8\u6548\u3001\u66f4\u5065\u58ee\u7684\u4ee3\u7801\u3002<\/p>\n

\u672c\u6587\u5c06\u4ece map \u7684\u57fa\u672c\u64cd\u4f5c\u5165\u624b，\u9010\u6b65\u6df1\u5165\u5176\u5e95\u5c42\u54c8\u5e0c\u8868\u5b9e\u73b0\u3001\u54c8\u5e0c\u51b2\u7a81\u7684\u89e3\u51b3\u65b9\u6cd5，\u5e76\u63a2\u8ba8\u5728\u5e76\u53d1\u573a\u666f\u4e0b\u4e3a\u4ec0\u4e48\u9700\u8981\u4f7f\u7528 sync.Map\u3002<\/p>\n

\u4e00\u3001Map \u7684\u57fa\u672c\u64cd\u4f5c：\u589e\u3001\u5220\u3001\u6539\u3001\u67e5\u4e0e\u904d\u5386<\/h4>\n

\u5728 Go \u8bed\u8a00\u4e2d，map \u662f\u4e00\u79cd\u5f15\u7528\u7c7b\u578b，\u5728\u4f7f\u7528\u524d\u5fc5\u987b\u8fdb\u884c\u521d\u59cb\u5316\u3002<\/p>\n

1.1 \u58f0\u660e\u4e0e\u521d\u59cb\u5316<\/h5>\n

\u6709\u4e24\u79cd\u4e3b\u8981\u7684\u521d\u59cb\u5316\u65b9\u5f0f：<\/p>\n

package<\/span> main<\/p>\n

import<\/span> "fmt"<\/span><\/p>\n

func<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
\n\/\/ \u65b9\u5f0f\u4e00：\u4f7f\u7528 make \u51fd\u6570\u521b\u5efa，\u6307\u5b9a\u952e\u7c7b\u578b\u548c\u503c\u7c7b\u578b<\/span>
\nvar<\/span> studentScores map<\/span>[<\/span>string<\/span>]<\/span>int<\/span>
\nstudentScores =<\/span> make<\/span>(<\/span>map<\/span>[<\/span>string<\/span>]<\/span>int<\/span>)<\/span> \/\/ \u521d\u59cb\u5316\u4e3a\u4e00\u4e2a\u7a7a\u7684 map<\/span>
\nfmt.<\/span>Println<\/span>(<\/span>"\u521d\u59cb\u5316\u7684 studentScores:"<\/span>,<\/span> studentScores)<\/span><\/p>\n

\/\/ \u65b9\u5f0f\u4e8c：\u58f0\u660e\u5e76\u76f4\u63a5\u4f7f\u7528\u5b57\u9762\u91cf\u521d\u59cb\u5316<\/span>
\npersonInfo :=<\/span> map<\/span>[<\/span>string<\/span>]<\/span>string<\/span>{<\/span>
\n"name"<\/span>:<\/span> "Alice"<\/span>,<\/span>
\n"age"<\/span>:<\/span> "30"<\/span>,<\/span>
\n"city"<\/span>:<\/span> "New York"<\/span>,<\/span>
\n}<\/span>
\nfmt.<\/span>Println<\/span>(<\/span>"\u521d\u59cb\u5316\u7684 personInfo:"<\/span>,<\/span> personInfo)<\/span><\/p>\n

\/\/ \u4e5f\u53ef\u4ee5\u53ea\u58f0\u660e\u4e0d\u521d\u59cb\u5316，\u6b64\u65f6 map \u7684\u96f6\u503c\u4e3a nil，\u4e0d\u80fd\u76f4\u63a5\u5199\u5165\u6570\u636e<\/span>
\nvar<\/span> nilMap map<\/span>[<\/span>string<\/span>]<\/span>int<\/span>
\nfmt.<\/span>Println<\/span>(<\/span>"nilMap (\u672a\u521d\u59cb\u5316):"<\/span>,<\/span> nilMap)<\/span> \/\/ \u8f93\u51fa: nilMap (\u672a\u521d\u59cb\u5316): map[]<\/span>
\n\/\/ nilMap["test"] = 10 \/\/ \u4f1a\u5f15\u53d1\u8fd0\u884c\u65f6\u9519\u8bef: panic: assignment to entry in nil map<\/span>
\n}<\/span><\/p>\n

\u6ce8\u610f： \u5bf9\u4e8e nil \u7684 map，\u53ea\u80fd\u8fdb\u884c\u8bfb\u64cd\u4f5c（\u7ed3\u679c\u662f\u5bf9\u5e94\u7c7b\u578b\u7684\u96f6\u503c）\u548c delete \u64cd\u4f5c（\u4e0d\u4f1a\u62a5\u9519），\u4f46\u4e0d\u80fd\u8fdb\u884c\u5199\u64cd\u4f5c\u3002<\/p>\n

1.2 \u589e\u52a0\u548c\u4fee\u6539\u5143\u7d20<\/h5>\n

map \u7684\u589e\u52a0\u548c\u4fee\u6539\u64cd\u4f5c\u662f\u540c\u4e00\u4e2a\u8bed\u6cd5：map[key] = value\u3002\u5982\u679c key \u4e0d\u5b58\u5728，\u5219\u4f1a\u589e\u52a0\u4e00\u4e2a\u65b0\u5143\u7d20；\u5982\u679c key \u5df2\u5b58\u5728，\u5219\u4f1a\u66f4\u65b0\u5176\u5bf9\u5e94\u7684 value\u3002<\/p>\n

package<\/span> main<\/p>\n

import<\/span> "fmt"<\/span><\/p>\n

func<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
\nstudentScores :=<\/span> make<\/span>(<\/span>map<\/span>[<\/span>string<\/span>]<\/span>int<\/span>)<\/span><\/p>\n

\/\/ \u589e\u52a0\u5143\u7d20<\/span>
\nstudentScores[<\/span>"\u5f20\u4e09"<\/span>]<\/span> =<\/span> 95<\/span>
\nstudentScores[<\/span>"\u674e\u56db"<\/span>]<\/span> =<\/span> 88<\/span>
\nfmt.<\/span>Println<\/span>(<\/span>"\u589e\u52a0\u5143\u7d20\u540e:"<\/span>,<\/span> studentScores)<\/span> \/\/ \u8f93\u51fa: \u589e\u52a0\u5143\u7d20\u540e: map[\u674e\u56db:88 \u5f20\u4e09:95]<\/span><\/p>\n

\/\/ \u4fee\u6539\u5143\u7d20<\/span>
\nstudentScores[<\/span>"\u5f20\u4e09"<\/span>]<\/span> =<\/span> 100<\/span> \/\/ \u5f20\u4e09\u7684\u5206\u6570\u88ab\u66f4\u65b0\u4e3a 100<\/span>
\nfmt.<\/span>Println<\/span>(<\/span>"\u4fee\u6539\u5143\u7d20\u540e:"<\/span>,<\/span> studentScores)<\/span> \/\/ \u8f93\u51fa: \u4fee\u6539\u5143\u7d20\u540e: map[\u674e\u56db:88 \u5f20\u4e09:100]<\/span>
\n}<\/span><\/p>\n

1.3 \u67e5\u8be2\u5143\u7d20<\/h5>\n

\u67e5\u8be2 map \u5143\u7d20\u4e5f\u4f7f\u7528 map[key] \u8bed\u6cd5\u3002Go \u8bed\u8a00\u63d0\u4f9b\u4e86\u4e00\u4e2a\u201c\u9017\u53f7 ok\u201d\u7684\u60ef\u7528\u6cd5\u6765\u5224\u65ad\u952e\u662f\u5426\u5b58\u5728\u3002<\/p>\n

package<\/span> main<\/p>\n

import<\/span> "fmt"<\/span><\/p>\n

func<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
\npersonInfo :=<\/span> map<\/span>[<\/span>string<\/span>]<\/span>string<\/span>{<\/span>
\n"name"<\/span>:<\/span> "Alice"<\/span>,<\/span>
\n"age"<\/span>:<\/span> "30"<\/span>,<\/span>
\n"city"<\/span>:<\/span> "New York"<\/span>,<\/span>
\n}<\/span><\/p>\n

\/\/ \u67e5\u8be2\u5b58\u5728\u7684\u5143\u7d20<\/span>
\nname :=<\/span> personInfo[<\/span>"name"<\/span>]<\/span>
\nfmt.<\/span>Println<\/span>(<\/span>"\u59d3\u540d:"<\/span>,<\/span> name)<\/span> \/\/ \u8f93\u51fa: \u59d3\u540d: Alice<\/span><\/p>\n

\/\/ \u67e5\u8be2\u4e0d\u5b58\u5728\u7684\u5143\u7d20<\/span>
\ncountry :=<\/span> personInfo[<\/span>"country"<\/span>]<\/span>
\nfmt.<\/span>Println<\/span>(<\/span>"\u56fd\u5bb6 (\u4e0d\u5b58\u5728):"<\/span>,<\/span> country)<\/span> \/\/ \u8f93\u51fa: \u56fd\u5bb6 (\u4e0d\u5b58\u5728):<\/span><\/p>\n

\/\/ \u5224\u65ad\u952e\u662f\u5426\u5b58\u5728 (\u63a8\u8350\u7528\u6cd5)<\/span>
\nif<\/span> age,<\/span> ok :=<\/span> personInfo[<\/span>"age"<\/span>]<\/span>;<\/span> ok {<\/span>
\nfmt.<\/span>Println<\/span>(<\/span>"\u5e74\u9f84\u5b58\u5728:"<\/span>,<\/span> age)<\/span> \/\/ \u8f93\u51fa: \u5e74\u9f84\u5b58\u5728: 30<\/span>
\n}<\/span> else<\/span> {<\/span>
\nfmt.<\/span>Println<\/span>(<\/span>"\u5e74\u9f84\u4e0d\u5b58\u5728"<\/span>)<\/span>
\n}<\/span><\/p>\n

if<\/span> gender,<\/span> ok :=<\/span> personInfo[<\/span>"gender"<\/span>]<\/span>;<\/span> ok {<\/span>
\nfmt.<\/span>Println<\/span>(<\/span>"\u6027\u522b\u5b58\u5728:"<\/span>,<\/span> gender)<\/span>
\n}<\/span> else<\/span> {<\/span>
\nfmt.<\/span>Println<\/span>(<\/span>"\u6027\u522b\u4e0d\u5b58\u5728"<\/span>)<\/span> \/\/ \u8f93\u51fa: \u6027\u522b\u4e0d\u5b58\u5728<\/span>
\n}<\/span>
\n}<\/span><\/p>\n

1.4 \u5220\u9664\u5143\u7d20<\/h5>\n

\u4f7f\u7528\u5185\u7f6e\u7684 delete \u51fd\u6570\u53ef\u4ee5\u4ece map \u4e2d\u5220\u9664\u4e00\u4e2a\u5143\u7d20\u3002\u5373\u4f7f\u8981\u5220\u9664\u7684\u952e\u4e0d\u5b58\u5728，delete \u51fd\u6570\u4e5f\u4e0d\u4f1a\u5f15\u53d1\u9519\u8bef\u3002<\/p>\n

package<\/span> main<\/p>\n

import<\/span> "fmt"<\/span><\/p>\n

func<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
\nstudentScores :=<\/span> map<\/span>[<\/span>string<\/span>]<\/span>int<\/span>{<\/span>
\n"\u5f20\u4e09"<\/span>:<\/span> 95<\/span>,<\/span>
\n"\u674e\u56db"<\/span>:<\/span> 88<\/span>,<\/span>
\n"\u738b\u4e94"<\/span>:<\/span> 72<\/span>,<\/span>
\n}<\/span>
\nfmt.<\/span>Println<\/span>(<\/span>"\u539f\u59cb map:"<\/span>,<\/span> studentScores)<\/span> \/\/ \u8f93\u51fa: \u539f\u59cb map: map[\u674e\u56db:88 \u738b\u4e94:72 \u5f20\u4e09:95]<\/span><\/p>\n

\/\/ \u5220\u9664\u5b58\u5728\u7684\u5143\u7d20<\/span>
\ndelete<\/span>(<\/span>studentScores,<\/span> "\u674e\u56db"<\/span>)<\/span>
\nfmt.<\/span>Println<\/span>(<\/span>"\u5220\u9664\u674e\u56db\u540e:"<\/span>,<\/span> studentScores)<\/span> \/\/ \u8f93\u51fa: \u5220\u9664\u674e\u56db\u540e: map[\u738b\u4e94:72 \u5f20\u4e09:95]<\/span><\/p>\n

\/\/ \u5220\u9664\u4e0d\u5b58\u5728\u7684\u5143\u7d20 (\u4e0d\u62a5\u9519)<\/span>
\ndelete<\/span>(<\/span>studentScores,<\/span> "\u8d75\u516d"<\/span>)<\/span>
\nfmt.<\/span>Println<\/span>(<\/span>"\u5220\u9664\u8d75\u516d\u540e (\u4e0d\u5b58\u5728):"<\/span>,<\/span> studentScores)<\/span> \/\/ \u8f93\u51fa: \u5220\u9664\u8d75\u516d\u540e (\u4e0d\u5b58\u5728): map[\u738b\u4e94:72 \u5f20\u4e09:95]<\/span>
\n}<\/span><\/p>\n

1.5 \u904d\u5386 Map<\/h5>\n

\u4f7f\u7528 for…range \u5faa\u73af\u53ef\u4ee5\u904d\u5386 map \u4e2d\u7684\u6240\u6709\u952e\u503c\u5bf9\u3002\u904d\u5386\u7684\u987a\u5e8f\u662f\u4e0d\u56fa\u5b9a\u7684，\u6bcf\u6b21\u8fd0\u884c\u7a0b\u5e8f\u6216\u8005\u5bf9 map \u8fdb\u884c\u64cd\u4f5c\u540e，\u987a\u5e8f\u90fd\u53ef\u80fd\u53d1\u751f\u53d8\u5316\u3002<\/p>\n

package<\/span> main<\/p>\n

import<\/span> "fmt"<\/span><\/p>\n

func<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
\npersonInfo :=<\/span> map<\/span>[<\/span>string<\/span>]<\/span>string<\/span>{<\/span>
\n"name"<\/span>:<\/span> "Alice"<\/span>,<\/span>
\n"age"<\/span>:<\/span> "30"<\/span>,<\/span>
\n"city"<\/span>:<\/span> "New York"<\/span>,<\/span>
\n"country"<\/span>:<\/span> "USA"<\/span>,<\/span>
\n}<\/span><\/p>\n

fmt.<\/span>Println<\/span>(<\/span>"\u904d\u5386 map (\u952e\u503c\u5bf9):"<\/span>)<\/span>
\nfor<\/span> key,<\/span> value :=<\/span> range<\/span> personInfo {<\/span>
\nfmt.<\/span>Printf<\/span>(<\/span>"\u952e: %s, \u503c: %s\\\\n"<\/span>,<\/span> key,<\/span> value)<\/span>
\n}<\/span><\/p>\n

fmt.<\/span>Println<\/span>(<\/span>"\\\\n\u904d\u5386 map (\u53ea\u83b7\u53d6\u952e):"<\/span>)<\/span>
\nfor<\/span> key :=<\/span> range<\/span> personInfo {<\/span>
\nfmt.<\/span>Println<\/span>(<\/span>"\u952e:"<\/span>,<\/span> key)<\/span>
\n}<\/span><\/p>\n

fmt.<\/span>Println<\/span>(<\/span>"\\\\n\u904d\u5386 map (\u53ea\u83b7\u53d6\u503c):"<\/span>)<\/span>
\nfor<\/span> _<\/span>,<\/span> value :=<\/span> range<\/span> personInfo {<\/span>
\nfmt.<\/span>Println<\/span>(<\/span>"\u503c:"<\/span>,<\/span> value)<\/span>
\n}<\/span>
\n}<\/span><\/p>\n

\u4e8c\u3001Map \u7684\u5e95\u5c42\u5b9e\u73b0\u539f\u7406：\u54c8\u5e0c\u8868 (Hash Table)<\/h4>\n

Go \u8bed\u8a00\u7684 map \u5e95\u5c42\u662f\u901a\u8fc7\u54c8\u5e0c\u8868（Hash Table）\u5b9e\u73b0\u7684\u3002\u54c8\u5e0c\u8868\u662f\u4e00\u79cd\u6570\u636e\u7ed3\u6784，\u5b83\u901a\u8fc7\u54c8\u5e0c\u51fd\u6570\u5c06\u952e（key）\u6620\u5c04\u5230\u5185\u5b58\u4e2d\u7684\u4e00\u4e2a\u4f4d\u7f6e（\u6876，bucket），\u4ece\u800c\u5b9e\u73b0\u5feb\u901f\u7684\u5b58\u53d6\u3002<\/p>\n

2.1 \u4ec0\u4e48\u662f\u54c8\u5e0c\u8868？<\/h5>\n

\u54c8\u5e0c\u8868\u7684\u6838\u5fc3\u601d\u60f3\u662f：<\/p>\n

  • \u54c8\u5e0c\u51fd\u6570 (Hash Function): \u5c06\u4efb\u610f\u957f\u5ea6\u7684\u952e\u901a\u8fc7\u4e00\u4e2a\u786e\u5b9a\u6027\u7684\u7b97\u6cd5\u8f6c\u6362\u6210\u4e00\u4e2a\u56fa\u5b9a\u957f\u5ea6\u7684\u6570\u5b57（\u54c8\u5e0c\u503c）\u3002<\/li>\n
  • \u6876 (Bucket): \u5185\u5b58\u4e2d\u5b58\u50a8\u952e\u503c\u5bf9\u7684\u6570\u7ec4\u3002\u54c8\u5e0c\u503c\u901a\u5e38\u7528\u6765\u51b3\u5b9a\u952e\u503c\u5bf9\u5e94\u8be5\u5b58\u50a8\u5728\u54ea\u4e2a\u6876\u4e2d\u3002<\/li>\n

    \u5f53\u6211\u4eec\u63d2\u5165\u4e00\u4e2a\u952e\u503c\u5bf9\u65f6，map \u4f1a\u5148\u5bf9\u952e\u8fdb\u884c\u54c8\u5e0c\u8fd0\u7b97，\u5f97\u5230\u4e00\u4e2a\u54c8\u5e0c\u503c，\u7136\u540e\u6839\u636e\u8fd9\u4e2a\u54c8\u5e0c\u503c\u786e\u5b9a\u5b83\u5e94\u8be5\u5b58\u50a8\u5728\u54ea\u4e00\u4e2a\u6876\u4e2d\u3002\u5f53\u6211\u4eec\u67e5\u627e\u4e00\u4e2a\u952e\u65f6，\u540c\u6837\u4f1a\u8ba1\u7b97\u54c8\u5e0c\u503c，\u76f4\u63a5\u5b9a\u4f4d\u5230\u5bf9\u5e94\u7684\u6876，\u4ece\u800c\u5927\u5927\u63d0\u9ad8\u67e5\u627e\u6548\u7387\u3002<\/p>\n

    2.2 Go Map \u7684\u5185\u90e8\u7ed3\u6784<\/h5>\n

    Go \u8bed\u8a00\u7684 map \u5e76\u4e0d\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u6570\u7ec4，\u5b83\u7684\u5e95\u5c42\u7ed3\u6784\u6bd4\u8fd9\u8981\u590d\u6742\u4e00\u4e9b\u3002\u5728 Go \u7684\u8fd0\u884c\u65f6（runtime）\u4e2d，map \u7684\u6838\u5fc3\u7ed3\u6784\u662f hmap \u548c bmap\u3002<\/p>\n

      \n
    • \n

      hmap (Header Map): \u8fd9\u662f map \u7684\u8fd0\u884c\u65f6\u8868\u793a，\u5305\u542b\u4e86 map \u7684\u5143\u4fe1\u606f，\u4f8b\u5982：<\/p>\n

        \n
      • count: \u5f53\u524d map \u4e2d\u5b58\u50a8\u7684\u5143\u7d20\u6570\u91cf\u3002<\/li>\n
      • flags: \u6807\u5fd7\u4f4d，\u8868\u793a map \u5f53\u524d\u7684\u72b6\u6001（\u5982\u662f\u5426\u5904\u4e8e\u5199\u5165\u4e2d\u3001\u662f\u5426\u5728\u6269\u5bb9\u7b49）\u3002<\/li>\n
      • B: map \u4e2d\u6876\u7684\u6570\u91cf\u7684\u5bf9\u6570，\u5373 \u6876\u6570\u91cf = 2^B\u3002\u4f8b\u5982，\u5982\u679c B=5，\u5219\u6709 2^5 = 32 \u4e2a\u6876\u3002<\/li>\n
      • hash0: \u54c8\u5e0c\u79cd\u5b50，\u7528\u4e8e\u4fdd\u8bc1\u6bcf\u6b21\u7a0b\u5e8f\u8fd0\u884c map \u7684\u904d\u5386\u987a\u5e8f\u968f\u673a（\u5373\u4f7f\u952e\u76f8\u540c）\u3002<\/li>\n
      • buckets: \u6307\u5411\u6876\u6570\u7ec4\u7684\u6307\u9488\u3002<\/li>\n
      • oldbuckets: \u5728\u6269\u5bb9\u65f6，\u6307\u5411\u65e7\u7684\u6876\u6570\u7ec4\u7684\u6307\u9488\u3002<\/li>\n
      • nevacuate: \u6269\u5bb9\u65f6\u9700\u8981\u8fc1\u79fb\u7684\u6876\u6570\u91cf\u3002<\/li>\n<\/ul>\n<\/li>\n
      • \n

        bmap (Bucket Map): \u8fd9\u662f\u5b9e\u9645\u5b58\u50a8\u952e\u503c\u5bf9\u7684\u6876\u3002\u6bcf\u4e2a\u6876\u662f\u4e00\u4e2a\u56fa\u5b9a\u5927\u5c0f\u7684\u6570\u7ec4，\u901a\u5e38\u53ef\u4ee5\u5b58\u50a8 8 \u4e2a\u952e\u503c\u5bf9\u3002<\/p>\n

          \n
        • tophash: \u4e00\u4e2a [8]uint8 \u7c7b\u578b\u7684\u6570\u7ec4，\u5b58\u50a8\u4e86\u6bcf\u4e2a\u952e\u7684\u54c8\u5e0c\u503c\u7684\u9ad8 8 \u4f4d\u3002\u8fd9\u662f\u4e3a\u4e86\u5728\u67e5\u627e\u65f6\u5feb\u901f\u8fc7\u6ee4，\u907f\u514d\u5b8c\u6574\u6bd4\u8f83\u952e\u3002<\/li>\n
        • keys: \u4e00\u4e2a [8]keyType \u7c7b\u578b\u7684\u6570\u7ec4，\u5b58\u50a8\u952e\u3002<\/li>\n
        • values: \u4e00\u4e2a [8]valueType \u7c7b\u578b\u7684\u6570\u7ec4，\u5b58\u50a8\u503c\u3002<\/li>\n
        • overflow: \u6307\u5411\u4e0b\u4e00\u4e2a bmap \u7684\u6307\u9488\u3002\u5f53\u4e00\u4e2a\u6876\u5b58\u50a8\u7684\u952e\u503c\u5bf9\u8d85\u8fc7 8 \u4e2a\u65f6，\u4f1a\u901a\u8fc7 overflow \u6307\u9488\u8fde\u63a5\u4e00\u4e2a\u6ea2\u51fa\u6876（bmap），\u5f62\u6210\u94fe\u8868\u7ed3\u6784\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

          \u7ed3\u6784\u793a\u610f\u56fe (\u6982\u5ff5\u5c42\u9762，\u975e\u7cbe\u786e C \u8bed\u8a00\u7ed3\u6784):<\/p>\n

          hmap
          \n+—————–+
          \n| count | \u5143\u7d20\u6570\u91cf
          \n| B | 2^B \u662f\u6876\u7684\u6570\u91cf
          \n| hash0 | \u54c8\u5e0c\u79cd\u5b50
          \n| buckets |—–> [bmap1, bmap2, bmap3, …, bmapN] (\u4e3b\u6876\u6570\u7ec4)
          \n| oldbuckets |—–> [bmap_old1, …] (\u6269\u5bb9\u65f6\u5b58\u5728\u7684\u65e7\u6876\u6570\u7ec4)
          \n| … |
          \n+—————–+
          \n |
          \n V
          \n bmap (\u6876)
          \n +———————————+
          \n | tophash [8]uint8 | (\u6bcf\u4e2a\u952e\u54c8\u5e0c\u503c\u7684\u9ad88\u4f4d)
          \n | keys [8]keyType | (\u952e\u6570\u7ec4)
          \n | values [8]valueType | (\u503c\u6570\u7ec4)
          \n | overflow *bmap | (\u6ea2\u51fa\u6876\u6307\u9488，\u5f62\u6210\u94fe\u8868)
          \n +———————————+<\/p>\n

          2.3 \u6570\u636e\u5b58\u53d6\u8fc7\u7a0b<\/h5>\n

          \u5f53\u5bf9 map \u8fdb\u884c\u64cd\u4f5c\u65f6（\u5982\u63d2\u5165\u3001\u67e5\u627e），Go \u7684\u8fd0\u884c\u65f6\u4f1a\u6267\u884c\u4ee5\u4e0b\u6b65\u9aa4：<\/p>\n

        • \u8ba1\u7b97\u54c8\u5e0c\u503c： \u5bf9\u4f20\u5165\u7684 key \u4f7f\u7528 Go \u5185\u7f6e\u7684\u54c8\u5e0c\u51fd\u6570\u8ba1\u7b97\u5176\u54c8\u5e0c\u503c\u3002Go \u7684\u54c8\u5e0c\u51fd\u6570\u662f\u975e\u516c\u5f00\u7684，\u5e76\u4e14\u6bcf\u6b21\u7a0b\u5e8f\u8fd0\u884c\u7684\u54c8\u5e0c\u79cd\u5b50 hash0 \u4f1a\u968f\u673a\u751f\u6210，\u8fd9\u6709\u52a9\u4e8e\u9632\u6b62\u6076\u610f\u7684\u54c8\u5e0c\u78b0\u649e\u653b\u51fb，\u4e5f\u5bfc\u81f4 map \u7684\u904d\u5386\u987a\u5e8f\u662f\u4e0d\u56fa\u5b9a\u7684\u3002<\/li>\n
        • \u786e\u5b9a\u6876\u7f16\u53f7： \u54c8\u5e0c\u503c\u7684\u4f4e B \u4f4d\u7528\u4e8e\u786e\u5b9a\u6570\u636e\u5e94\u8be5\u843d\u5728\u54ea\u4e2a\u4e3b\u6876 bmap \u4e2d（\u5373 \u54c8\u5e0c\u503c & (2^B – 1)）\u3002<\/li>\n
        • \u6876\u5185\u67e5\u627e：\n
            \n
          • \u904d\u5386\u76ee\u6807\u6876（\u4ee5\u53ca\u5176\u53ef\u80fd\u5b58\u5728\u7684\u6ea2\u51fa\u6876\u94fe\u8868）\u4e2d\u7684 tophash \u6570\u7ec4，\u5feb\u901f\u5339\u914d\u54c8\u5e0c\u503c\u7684\u9ad8 8 \u4f4d\u3002<\/li>\n
          • \u5982\u679c tophash \u5339\u914d，\u5219\u8fdb\u4e00\u6b65\u6bd4\u8f83\u5b8c\u6574\u7684 key \u503c\u3002<\/li>\n
          • \u5982\u679c\u627e\u5230\u5339\u914d\u7684 key，\u5219\u8fd4\u56de\u6216\u66f4\u65b0\u5176 value\u3002<\/li>\n
          • \u5982\u679c\u672a\u627e\u5230，\u5219\u5728\u6876\u5185\u627e\u5230\u7a7a\u4f4d\u63d2\u5165（\u63d2\u5165\u64cd\u4f5c），\u6216\u8fd4\u56de\u96f6\u503c\u548c false（\u67e5\u8be2\u64cd\u4f5c）\u3002<\/li>\n<\/ul>\n<\/li>\n

            \u4e09\u3001\u54c8\u5e0c\u51b2\u7a81\u53ca\u5176\u89e3\u51b3：\u94fe\u8868\u6cd5\u4e0e\u6269\u5bb9<\/h4>\n

            \u54c8\u5e0c\u51b2\u7a81\u662f\u54c8\u5e0c\u8868\u4e0d\u53ef\u907f\u514d\u7684\u95ee\u9898\u3002\u6240\u8c13\u54c8\u5e0c\u51b2\u7a81，\u5c31\u662f\u4e0d\u540c\u7684\u952e\u7ecf\u8fc7\u54c8\u5e0c\u51fd\u6570\u8ba1\u7b97\u540e，\u5f97\u5230\u4e86\u76f8\u540c\u7684\u54c8\u5e0c\u503c，\u4ece\u800c\u88ab\u6620\u5c04\u5230\u4e86\u540c\u4e00\u4e2a\u6876\u3002<\/p>\n

            3.1 \u54c8\u5e0c\u51b2\u7a81\u7684\u89e3\u51b3：\u94fe\u8868\u6cd5 (Separate Chaining)<\/h5>\n

            Go map \u89e3\u51b3\u54c8\u5e0c\u51b2\u7a81\u7684\u4e3b\u8981\u65b9\u6cd5\u662f\u94fe\u8868\u6cd5 (Separate Chaining)\u3002\u5f53\u4e00\u4e2a\u6876\u4e2d\u7684 8 \u4e2a\u952e\u503c\u5bf9\u90fd\u88ab\u5360\u6ee1\u65f6，\u5982\u679c\u65b0\u7684\u952e\u4ecd\u7136\u54c8\u5e0c\u5230\u8fd9\u4e2a\u6876，Go \u4f1a\u4e3a\u8fd9\u4e2a\u6876\u5206\u914d\u4e00\u4e2a\u65b0\u7684\u6ea2\u51fa\u6876（bmap），\u5e76\u7528 overflow \u6307\u9488\u5c06\u5b83\u4eec\u94fe\u63a5\u8d77\u6765，\u5f62\u6210\u4e00\u4e2a\u94fe\u8868\u3002\u8fd9\u6837，\u4e00\u4e2a\u903b\u8f91\u4e0a\u7684\u6876\u5b9e\u9645\u4e0a\u53ef\u80fd\u7531\u591a\u4e2a\u7269\u7406\u4e0a\u7684 bmap \u7ec4\u6210\u3002<\/p>\n

            Bucket[i] (bmap1)
            \n +—————–+
            \n | tophash[8] |
            \n | keys[8] |
            \n | values[8] |
            \n | overflow |—–> bmap2 (\u6ea2\u51fa\u6876)
            \n +—————–+ +—————–+
            \n | tophash[8] |
            \n | keys[8] |
            \n | values[8] |
            \n | overflow |—–> bmap3 (\u66f4\u591a\u6ea2\u51fa\u6876…)
            \n +—————–+<\/p>\n

            3.2 Map \u7684\u6269\u5bb9 (Resizing\/Rehashing)<\/h5>\n

            \u968f\u7740 map \u4e2d\u5143\u7d20\u6570\u91cf\u7684\u589e\u52a0，\u6876\u4e2d\u7684\u5143\u7d20\u4f1a\u8d8a\u6765\u8d8a\u591a，\u94fe\u8868\u4e5f\u4f1a\u8d8a\u6765\u8d8a\u957f，\u5bfc\u81f4\u67e5\u627e\u6548\u7387\u4e0b\u964d（\u4ece O(1) \u63a5\u8fd1 O(N)）\u3002\u4e3a\u4e86\u4fdd\u6301 map \u7684\u9ad8\u6027\u80fd，Go \u4f1a\u5728\u7279\u5b9a\u6761\u4ef6\u4e0b\u89e6\u53d1\u6269\u5bb9\u3002<\/p>\n

            \u6269\u5bb9\u7684\u89e6\u53d1\u6761\u4ef6\u4e3b\u8981\u6709\u4e24\u4e2a：<\/p>\n

          • \n

            \u8d1f\u8f7d\u56e0\u5b50 (Load Factor) \u8fc7\u9ad8： \u5f53 map \u7684\u5e73\u5747\u8d1f\u8f7d\u56e0\u5b50（\u5143\u7d20\u603b\u6570 \/ \u6876\u6570\u91cf）\u8fbe\u5230\u6216\u8d85\u8fc7 6.5 \u65f6，map \u4f1a\u8fdb\u884c\u7b49\u91cf\u6269\u5bb9，\u5373\u6876\u7684\u6570\u91cf\u53d8\u4e3a\u539f\u6765\u7684\u4e24\u500d (B \u589e\u52a0 1)\u3002<\/p>\n

              \n
            • loadFactor = count \/ (2^B)<\/li>\n
            • \u4e3a\u4ec0\u4e48\u662f 6.5 \u800c\u4e0d\u662f 8？\u56e0\u4e3a\u8003\u8651\u5230\u6ea2\u51fa\u6876\u7684\u5b58\u5728\u548c\u54c8\u5e0c\u51fd\u6570\u7684\u5206\u5e03\u6027，6.5 \u662f\u4e00\u4e2a\u7ecf\u9a8c\u503c，\u80fd\u591f\u5e73\u8861\u7a7a\u95f4\u548c\u65f6\u95f4\u6548\u7387\u3002<\/li>\n<\/ul>\n<\/li>\n
            • \n

              \u6ea2\u51fa\u6876\u8fc7\u591a： \u5f53 map \u4e2d\u5b58\u5728\u8fc7\u591a\u7684\u6ea2\u51fa\u6876\u65f6，\u5373\u4f7f\u603b\u5143\u7d20\u6570\u91cf\u4e0d\u591a，\u4e5f\u53ef\u80fd\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\u3002\u5f53\u6876\u7684\u6570\u91cf（2^B）\u5c0f\u4e8e 32 \u4e14\u5b58\u5728\u8fc7\u591a\u7684\u6ea2\u51fa\u6876\u65f6，map \u4f1a\u8fdb\u884c\u7b49\u91cf\u6269\u5bb9\u3002\u5f53\u6876\u7684\u6570\u91cf\u5927\u4e8e\u7b49\u4e8e 32 \u65f6，\u53ea\u8981\u6709\u4e00\u4e2a\u6876\u7684\u6ea2\u51fa\u6876\u6570\u91cf\u8d85\u8fc7 8 \u4e2a，\u4e5f\u4f1a\u89e6\u53d1\u6269\u5bb9（\u8fd9\u662f\u4e00\u79cd\u66f4\u79ef\u6781\u7684\u6269\u5bb9，\u4e3a\u4e86\u5904\u7406\u4e2a\u522b\u6876\u94fe\u8fc7\u957f\u7684\u60c5\u51b5）\u3002<\/p>\n<\/li>\n

              \u6269\u5bb9\u8fc7\u7a0b：\u6e10\u8fdb\u5f0f\u6269\u5bb9 (Gradual Resizing)<\/p>\n

              Go \u8bed\u8a00\u7684 map \u6269\u5bb9\u662f\u4e00\u4e2a\u6e10\u8fdb\u5f0f\u7684\u8fc7\u7a0b，\u800c\u4e0d\u662f\u4e00\u6b21\u6027\u5b8c\u6210\u6240\u6709\u6570\u636e\u7684\u8fc1\u79fb\u3002\u8fd9\u662f\u4e3a\u4e86\u907f\u514d\u5728\u6269\u5bb9\u65f6\u957f\u65f6\u95f4\u963b\u585e\u7a0b\u5e8f，\u5f71\u54cd\u6027\u80fd\u3002<\/p>\n

            • \u5f53\u6ee1\u8db3\u6269\u5bb9\u6761\u4ef6\u65f6，Go \u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u6876\u6570\u7ec4 new_buckets，\u5176\u5927\u5c0f\u662f\u65e7\u6876\u6570\u7ec4 old_buckets \u7684\u4e24\u500d\u3002\u6b64\u65f6，hmap \u4f1a\u540c\u65f6\u6301\u6709 buckets（\u65b0\u7684\u7a7a\u6876\u6570\u7ec4）\u548c oldbuckets（\u65e7\u7684\u6ee1\u6876\u6570\u7ec4）\u4e24\u4e2a\u6307\u9488\u3002<\/li>\n
            • map \u5e76\u4e0d\u4f1a\u7acb\u5373\u5c06\u6240\u6709\u65e7\u6876\u4e2d\u7684\u6570\u636e\u8fc1\u79fb\u5230\u65b0\u6876\u3002\u800c\u662f\u6bcf\u6b21\u5bf9 map \u8fdb\u884c\u64cd\u4f5c（\u63d2\u5165\u3001\u5220\u9664\u3001\u67e5\u627e）\u65f6，\u4f1a\u68c0\u67e5\u662f\u5426\u9700\u8981\u8fdb\u884c\u6570\u636e\u8fc1\u79fb\u3002<\/li>\n
            • \u6bcf\u6b21\u64cd\u4f5c，map \u4f1a\u5c06 oldbuckets \u4e2d\u7684\u4e00\u4e2a\u6216\u4e24\u4e2a\u6876\u7684\u6570\u636e\u8fc1\u79fb\u5230 new_buckets \u4e2d\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u662f\u6309\u9700\u8fdb\u884c\u7684，\u76f4\u5230 oldbuckets \u4e2d\u7684\u6240\u6709\u6570\u636e\u90fd\u8fc1\u79fb\u5b8c\u6bd5\u3002<\/li>\n
            • \u8fc1\u79fb\u5b8c\u6210\u540e，oldbuckets \u6307\u9488\u4f1a\u88ab\u7f6e\u4e3a nil，\u65e7\u7684\u6876\u6570\u7ec4\u4f1a\u88ab\u5783\u573e\u56de\u6536\u5668\u56de\u6536\u3002<\/li>\n

              \u8fd9\u79cd\u6e10\u8fdb\u5f0f\u6269\u5bb9\u7b56\u7565，\u5c06\u6269\u5bb9\u7684\u5f00\u9500\u5206\u644a\u5230\u591a\u6b21 map \u64cd\u4f5c\u4e2d，\u907f\u514d\u4e86\u5355\u6b21\u64cd\u4f5c\u7684\u6027\u80fd\u9ad8\u5cf0，\u5bf9\u5b9e\u65f6\u6027\u8981\u6c42\u8f83\u9ad8\u7684\u670d\u52a1\u975e\u5e38\u53cb\u597d\u3002<\/p>\n

              \u56db\u3001\u5e76\u53d1\u5b89\u5168\u4e0e sync.Map<\/h4>\n

              Go \u8bed\u8a00\u5185\u7f6e\u7684 map \u4e0d\u662f\u5e76\u53d1\u5b89\u5168\u7684\u3002\u8fd9\u610f\u5473\u7740\u5728\u591a\u4e2a Goroutine \u5e76\u53d1\u8bfb\u5199\u540c\u4e00\u4e2a map \u65f6，\u4f1a\u53d1\u751f\u6570\u636e\u7ade\u4e89（Data Race），\u5bfc\u81f4\u7a0b\u5e8f\u884c\u4e3a\u4e0d\u786e\u5b9a，\u751a\u81f3\u5d29\u6e83\u3002<\/p>\n

              package<\/span> main<\/p>\n

              import<\/span> (<\/span>
              \n"fmt"<\/span>
              \n"sync"<\/span>
              \n"time"<\/span>
              \n)<\/span><\/p>\n

              func<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
              \n\/\/ \u8fd9\u662f\u4e00\u4e2a\u5e76\u53d1\u4e0d\u5b89\u5168\u7684 map \u793a\u4f8b<\/span>
              \nm :=<\/span> make<\/span>(<\/span>map<\/span>[<\/span>int<\/span>]<\/span>int<\/span>)<\/span>
              \nwg :=<\/span> sync.<\/span>WaitGroup{<\/span>}<\/span><\/p>\n

              for<\/span> i :=<\/span> 0<\/span>;<\/span> i <<\/span> 1000<\/span>;<\/span> i++<\/span> {<\/span>
              \nwg.<\/span>Add<\/span>(<\/span>1<\/span>)<\/span>
              \ngo<\/span> func<\/span>(<\/span>i int<\/span>)<\/span> {<\/span>
              \ndefer<\/span> wg.<\/span>Done<\/span>(<\/span>)<\/span>
              \nm[<\/span>i]<\/span> =<\/span> i \/\/ \u5e76\u53d1\u5199\u5165<\/span>
              \n_<\/span> =<\/span> m[<\/span>i]<\/span> \/\/ \u5e76\u53d1\u8bfb\u53d6<\/span>
              \n}<\/span>(<\/span>i)<\/span>
              \n}<\/span>
              \nwg.<\/span>Wait<\/span>(<\/span>)<\/span>
              \nfmt.<\/span>Println<\/span>(<\/span>"Done. (\u53ef\u80fd\u4f1a\u51fa\u73b0 panic: concurrent map writes)"<\/span>)<\/span>
              \n}<\/span><\/p>\n

              \u8fd0\u884c\u4e0a\u8ff0\u4ee3\u7801，\u4f60\u5f88\u53ef\u80fd\u4f1a\u770b\u5230\u7c7b\u4f3c fatal error: concurrent map writes \u7684\u9519\u8bef，\u6216\u8005\u5728 race detector \u6a21\u5f0f\u4e0b（go run -race your_program.go）\u68c0\u6d4b\u5230\u6570\u636e\u7ade\u4e89\u3002\u8fd9\u662f\u56e0\u4e3a\u591a\u4e2a Goroutine \u540c\u65f6\u4fee\u6539 map \u5185\u90e8\u7ed3\u6784（\u5982\u6876\u3001\u94fe\u8868\u6307\u9488），\u5bfc\u81f4\u6570\u636e\u4e0d\u4e00\u81f4\u3002<\/p>\n

              4.1 \u5982\u4f55\u5b9e\u73b0\u5e76\u53d1\u5b89\u5168？\u4f20\u7edf\u65b9\u6cd5 sync.RWMutex<\/h5>\n

              \u6700\u76f4\u63a5\u7684\u89e3\u51b3\u529e\u6cd5\u662f\u4f7f\u7528\u4e92\u65a5\u9501 (sync.Mutex) \u6216\u8bfb\u5199\u4e92\u65a5\u9501 (sync.RWMutex) \u6765\u4fdd\u62a4 map\u3002sync.RWMutex \u5141\u8bb8\u591a\u4e2a Goroutine \u540c\u65f6\u8bfb\u53d6，\u4f46\u5728\u5199\u5165\u65f6\u4f1a\u72ec\u5360\u9501，\u8fd9\u6837\u80fd\u63d0\u9ad8\u8bfb\u591a\u5199\u5c11\u7684\u573a\u666f\u4e0b\u7684\u5e76\u53d1\u6027\u80fd\u3002<\/p>\n

              package<\/span> main<\/p>\n

              import<\/span> (<\/span>
              \n"fmt"<\/span>
              \n"sync"<\/span>
              \n"time"<\/span>
              \n)<\/span><\/p>\n

              \/\/ SafeMap \u5c01\u88c5\u4e86 Go \u5185\u7f6e map，\u5e76\u4f7f\u7528 RWMutex \u4fdd\u8bc1\u5e76\u53d1\u5b89\u5168<\/span>
              \ntype<\/span> SafeMap struct<\/span> {<\/span>
              \nmu sync.<\/span>RWMutex
              \ndata map<\/span>[<\/span>string<\/span>]<\/span>interface<\/span>{<\/span>}<\/span>
              \n}<\/span><\/p>\n

              \/\/ NewSafeMap \u521b\u5efa\u4e00\u4e2a\u65b0\u7684 SafeMap<\/span>
              \nfunc<\/span> NewSafeMap<\/span>(<\/span>)<\/span> *<\/span>SafeMap {<\/span>
              \nreturn<\/span> &<\/span>SafeMap{<\/span>
              \ndata:<\/span> make<\/span>(<\/span>map<\/span>[<\/span>string<\/span>]<\/span>interface<\/span>{<\/span>}<\/span>)<\/span>,<\/span>
              \n}<\/span>
              \n}<\/span><\/p>\n

              \/\/ Store \u5b58\u50a8\u952e\u503c\u5bf9<\/span>
              \nfunc<\/span> (<\/span>sm *<\/span>SafeMap)<\/span> Store<\/span>(<\/span>key string<\/span>,<\/span> value interface<\/span>{<\/span>}<\/span>)<\/span> {<\/span>
              \nsm.<\/span>mu.<\/span>Lock<\/span>(<\/span>)<\/span> \/\/ \u5199\u64cd\u4f5c\u52a0\u5199\u9501<\/span>
              \ndefer<\/span> sm.<\/span>mu.<\/span>Unlock<\/span>(<\/span>)<\/span>
              \nsm.<\/span>data[<\/span>key]<\/span> =<\/span> value
              \n}<\/span><\/p>\n

              \/\/ Load \u83b7\u53d6\u952e\u5bf9\u5e94\u7684\u503c<\/span>
              \nfunc<\/span> (<\/span>sm *<\/span>SafeMap)<\/span> Load<\/span>(<\/span>key string<\/span>)<\/span> (<\/span>interface<\/span>{<\/span>}<\/span>,<\/span> bool<\/span>)<\/span> {<\/span>
              \nsm.<\/span>mu.<\/span>RLock<\/span>(<\/span>)<\/span> \/\/ \u8bfb\u64cd\u4f5c\u52a0\u8bfb\u9501<\/span>
              \ndefer<\/span> sm.<\/span>mu.<\/span>RUnlock<\/span>(<\/span>)<\/span>
              \nval,<\/span> ok :=<\/span> sm.<\/span>data[<\/span>key]<\/span>
              \nreturn<\/span> val,<\/span> ok
              \n}<\/span><\/p>\n

              \/\/ Delete \u5220\u9664\u952e<\/span>
              \nfunc<\/span> (<\/span>sm *<\/span>SafeMap)<\/span> Delete<\/span>(<\/span>key string<\/span>)<\/span> {<\/span>
              \nsm.<\/span>mu.<\/span>Lock<\/span>(<\/span>)<\/span> \/\/ \u5199\u64cd\u4f5c\u52a0\u5199\u9501<\/span>
              \ndefer<\/span> sm.<\/span>mu.<\/span>Unlock<\/span>(<\/span>)<\/span>
              \ndelete<\/span>(<\/span>sm.<\/span>data,<\/span> key)<\/span>
              \n}<\/span><\/p>\n

              func<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
              \nsafeMap :=<\/span> NewSafeMap<\/span>(<\/span>)<\/span>
              \nwg :=<\/span> sync.<\/span>WaitGroup{<\/span>}<\/span><\/p>\n

              \/\/ \u5e76\u53d1\u5199\u5165<\/span>
              \nfor<\/span> i :=<\/span> 0<\/span>;<\/span> i <<\/span> 1000<\/span>;<\/span> i++<\/span> {<\/span>
              \nwg.<\/span>Add<\/span>(<\/span>1<\/span>)<\/span>
              \ngo<\/span> func<\/span>(<\/span>i int<\/span>)<\/span> {<\/span>
              \ndefer<\/span> wg.<\/span>Done<\/span>(<\/span>)<\/span>
              \nkey :=<\/span> fmt.<\/span>Sprintf<\/span>(<\/span>"key_%d"<\/span>,<\/span> i)<\/span>
              \nsafeMap.<\/span>Store<\/span>(<\/span>key,<\/span> i)<\/span>
              \n}<\/span>(<\/span>i)<\/span>
              \n}<\/span>
              \nwg.<\/span>Wait<\/span>(<\/span>)<\/span>
              \nfmt.<\/span>Println<\/span>(<\/span>"\u6240\u6709\u5199\u5165\u5b8c\u6210"<\/span>)<\/span><\/p>\n

              \/\/ \u5e76\u53d1\u8bfb\u53d6<\/span>
              \nfor<\/span> i :=<\/span> 0<\/span>;<\/span> i <<\/span> 1000<\/span>;<\/span> i++<\/span> {<\/span>
              \nwg.<\/span>Add<\/span>(<\/span>1<\/span>)<\/span>
              \ngo<\/span> func<\/span>(<\/span>i int<\/span>)<\/span> {<\/span>
              \ndefer<\/span> wg.<\/span>Done<\/span>(<\/span>)<\/span>
              \nkey :=<\/span> fmt.<\/span>Sprintf<\/span>(<\/span>"key_%d"<\/span>,<\/span> i)<\/span>
              \nval,<\/span> ok :=<\/span> safeMap.<\/span>Load<\/span>(<\/span>key)<\/span>
              \nif<\/span> ok {<\/span>
              \n\/\/ fmt.Printf("Read key: %s, value: %v\\\\n", key, val)<\/span>
              \n}<\/span>
              \n}<\/span>(<\/span>i)<\/span>
              \n}<\/span>
              \nwg.<\/span>Wait<\/span>(<\/span>)<\/span>
              \nfmt.<\/span>Println<\/span>(<\/span>"\u6240\u6709\u8bfb\u53d6\u5b8c\u6210"<\/span>)<\/span><\/p>\n

              \/\/ \u9a8c\u8bc1\u6570\u636e<\/span>
              \nval,<\/span> ok :=<\/span> safeMap.<\/span>Load<\/span>(<\/span>"key_500"<\/span>)<\/span>
              \nif<\/span> ok {<\/span>
              \nfmt.<\/span>Printf<\/span>(<\/span>"\u9a8c\u8bc1: key_500 \u7684\u503c\u4e3a %v\\\\n"<\/span>,<\/span> val)<\/span>
              \n}<\/span><\/p>\n

              \/\/ \u8bfb\u5199\u6df7\u5408<\/span>
              \nfmt.<\/span>Println<\/span>(<\/span>"\\\\n\u5f00\u59cb\u8bfb\u5199\u6df7\u5408\u6d4b\u8bd5…"<\/span>)<\/span>
              \nfor<\/span> i :=<\/span> 0<\/span>;<\/span> i <<\/span> 1000<\/span>;<\/span> i++<\/span> {<\/span>
              \nwg.<\/span>Add<\/span>(<\/span>2<\/span>)<\/span>
              \ngo<\/span> func<\/span>(<\/span>i int<\/span>)<\/span> {<\/span>
              \ndefer<\/span> wg.<\/span>Done<\/span>(<\/span>)<\/span>
              \nkey :=<\/span> fmt.<\/span>Sprintf<\/span>(<\/span>"mix_key_%d"<\/span>,<\/span> i)<\/span>
              \nsafeMap.<\/span>Store<\/span>(<\/span>key,<\/span> i*<\/span>10<\/span>)<\/span> \/\/ \u5199\u5165<\/span>
              \n}<\/span>(<\/span>i)<\/span>
              \ngo<\/span> func<\/span>(<\/span>i int<\/span>)<\/span> {<\/span>
              \ndefer<\/span> wg.<\/span>Done<\/span>(<\/span>)<\/span>
              \nkey :=<\/span> fmt.<\/span>Sprintf<\/span>(<\/span>"mix_key_%d"<\/span>,<\/span> i\/<\/span>2<\/span>)<\/span>
              \nsafeMap.<\/span>Load<\/span>(<\/span>key)<\/span> \/\/ \u8bfb\u53d6<\/span>
              \n}<\/span>(<\/span>i)<\/span>
              \n}<\/span>
              \nwg.<\/span>Wait<\/span>(<\/span>)<\/span>
              \nfmt.<\/span>Println<\/span>(<\/span>"\u8bfb\u5199\u6df7\u5408\u6d4b\u8bd5\u5b8c\u6210"<\/span>)<\/span>
              \n}<\/span><\/p>\n

              \u8fd9\u79cd\u65b9\u6cd5\u7b80\u5355\u76f4\u89c2，\u9002\u7528\u4e8e\u5927\u591a\u6570\u5e76\u53d1\u573a\u666f\u3002\u4f46\u662f，\u5f53\u8bfb\u5199\u51b2\u7a81\u9891\u7e41，\u6216\u8005\u5199\u64cd\u4f5c\u975e\u5e38\u7a00\u5c11\u800c\u8bfb\u64cd\u4f5c\u6781\u5176\u9891\u7e41\u65f6，\u5373\u4f7f\u662f RWMutex \u4e5f\u4f1a\u5f15\u5165\u9501\u7684\u5f00\u9500，\u5f71\u54cd\u6027\u80fd\u3002<\/p>\n

              4.2 \u9ad8\u6027\u80fd\u5e76\u53d1 map：sync.Map<\/h5>\n

              \u4e3a\u4e86\u89e3\u51b3\u8bfb\u591a\u5199\u5c11\u573a\u666f\u4e0b map \u7684\u5e76\u53d1\u6027\u80fd\u95ee\u9898，Go 1.9 \u7248\u672c\u5f15\u5165\u4e86 sync.Map\u3002sync.Map \u5e76\u975e\u901a\u7528 map \u7684\u66ff\u4ee3\u54c1，\u5b83\u4e13\u95e8\u9488\u5bf9\u952e\u503c\u5bf9\u4e0d\u7ecf\u5e38\u53d8\u52a8\u4f46\u8bfb\u64cd\u4f5c\u975e\u5e38\u9891\u7e41\u7684\u573a\u666f\u8fdb\u884c\u4e86\u4f18\u5316\u3002<\/p>\n

              sync.Map \u7684\u8bbe\u8ba1\u601d\u60f3\u662f\u7a7a\u95f4\u6362\u65f6\u95f4，\u5176\u5185\u90e8\u7ef4\u62a4\u4e86\u4e24\u4e2a map：<\/p>\n

            • read map: \u4e3b\u8981\u7528\u4e8e\u8bfb\u53d6\u64cd\u4f5c，\u53ef\u4ee5\u65e0\u9501\u5e76\u53d1\u8bfb\u53d6\u3002\u5b83\u662f\u4e00\u4e2a readOnly \u7ed3\u6784\u4f53，\u5185\u90e8\u5305\u542b\u4e00\u4e2a\u666e\u901a map\u3002<\/li>\n
            • dirty map: \u4e3b\u8981\u7528\u4e8e\u5199\u5165\u64cd\u4f5c，\u4ee5\u53ca\u5728 read map \u4e2d\u672a\u627e\u5230\u65f6\u7684\u56de\u9000\u67e5\u627e\u3002dirty map \u7684\u5199\u64cd\u4f5c\u9700\u8981\u52a0\u9501\u4fdd\u62a4\u3002<\/li>\n

              sync.Map \u7684\u5de5\u4f5c\u539f\u7406：<\/p>\n

                \n
              • \u8bfb\u53d6 (Load):\n
              • \u9996\u5148\u5c1d\u8bd5\u4ece read map \u4e2d\u65e0\u9501\u8bfb\u53d6\u3002<\/li>\n
              • \u5982\u679c read map \u4e2d\u6ca1\u6709，\u5219\u4f1a\u52a0\u9501\u4ece dirty map \u4e2d\u8bfb\u53d6\u3002\u5982\u679c\u627e\u5230，\u4f1a\u5c06\u8be5\u952e\u503c\u5bf9\u63d0\u5347\u5230 read map \u4e2d（\u5728\u4e0b\u4e00\u6b21 read map \u5347\u7ea7\u65f6）\u3002<\/li>\n<\/li>\n
              • \u5199\u5165 (Store\/Delete):\n
              • \u6240\u6709\u5199\u5165\u64cd\u4f5c\u90fd\u5fc5\u987b\u52a0\u9501\u3002<\/li>\n
              • \u5199\u5165\u9996\u5148\u4fee\u6539 dirty map\u3002<\/li>\n
              • \u5982\u679c\u88ab\u5199\u5165\u7684\u952e\u5728 read map \u4e2d\u4e5f\u5b58\u5728，\u5219\u5728 read map \u4e2d\u5c06\u5176\u6807\u8bb0\u4e3a"\u8fc7\u671f"（\u901a\u8fc7\u8bbe\u7f6e\u4e00\u4e2a\u6807\u5fd7\u4f4d）\u3002<\/li>\n
              • \u5f53 dirty map \u4e2d\u7d2f\u79ef\u4e86\u8db3\u591f\u591a\u7684\u672a\u5728 read map \u4e2d\u4f53\u73b0\u7684\u4fee\u6539（\u901a\u5e38\u662f dirty map \u5199\u5165\u6b21\u6570\u4e0e read map \u8bbf\u95ee\u672a\u547d\u4e2d\u6b21\u6570\u4e4b\u548c），dirty map \u4f1a\u88ab\u63d0\u5347\u4e3a\u65b0\u7684 read map\u3002<\/li>\n<\/li>\n
              • \u63d0\u5347 (Promote):
                \n\u5f53 dirty map \u79ef\u7d2f\u4e86\u8db3\u591f\u7684\u5199\u64cd\u4f5c\u6216\u4ece read map \u672a\u547d\u4e2d\u7684\u8bfb\u53d6，sync.Map \u4f1a\u5c06\u5f53\u524d\u7684 dirty map \u63d0\u5347\u4e3a\u65b0\u7684 read map\u3002\u65e7\u7684 read map \u4f1a\u88ab\u4e22\u5f03，\u5e76\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u7a7a dirty map \u6765\u63a5\u6536\u540e\u7eed\u7684\u5199\u64cd\u4f5c\u3002\u8fd9\u4e2a\u63d0\u5347\u8fc7\u7a0b\u9700\u8981\u52a0\u9501，\u4f46\u5b83\u53d1\u751f\u5728\u540e\u53f0\u4e14\u9891\u7387\u76f8\u5bf9\u8f83\u4f4e\u3002<\/li>\n<\/ul>\n

                sync.Map \u7684\u5e38\u7528\u65b9\u6cd5：<\/p>\n

                  \n
                • Store(key, value interface{}): \u5b58\u50a8\u952e\u503c\u5bf9\u3002<\/li>\n
                • Load(key interface{}) (value interface{}, ok bool): \u8bfb\u53d6\u952e\u503c\u5bf9\u3002<\/li>\n
                • LoadOrStore(key, value interface{}) (actual interface{}, loaded bool): \u5982\u679c\u952e\u5b58\u5728\u5219\u52a0\u8f7d\u5e76\u8fd4\u56de，\u5426\u5219\u5b58\u50a8\u65b0\u7684\u503c\u3002<\/li>\n
                • Delete(key interface{}): \u5220\u9664\u952e\u3002<\/li>\n
                • Range(f func(key, value interface{}) bool): \u904d\u5386 map，\u9700\u8981\u63d0\u4f9b\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\u3002\u5982\u679c\u56de\u8c03\u51fd\u6570\u8fd4\u56de false，\u5219\u505c\u6b62\u904d\u5386\u3002<\/li>\n<\/ul>\n

                  sync.Map \u793a\u4f8b：<\/p>\n

                  package<\/span> main<\/p>\n

                  import<\/span> (<\/span>
                  \n"fmt"<\/span>
                  \n"sync"<\/span>
                  \n"time"<\/span>
                  \n)<\/span><\/p>\n

                  func<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
                  \nvar<\/span> m sync.<\/span>Map \/\/ \u58f0\u660e\u4e00\u4e2a sync.Map<\/span><\/p>\n

                  wg :=<\/span> sync.<\/span>WaitGroup{<\/span>}<\/span><\/p>\n

                  \/\/ \u6a21\u62df\u5927\u91cf\u5e76\u53d1\u5199\u5165<\/span>
                  \nfmt.<\/span>Println<\/span>(<\/span>"\u5f00\u59cb\u5927\u91cf\u5e76\u53d1\u5199\u5165…"<\/span>)<\/span>
                  \nfor<\/span> i :=<\/span> 0<\/span>;<\/span> i <<\/span> 10000<\/span>;<\/span> i++<\/span> {<\/span>
                  \nwg.<\/span>Add<\/span>(<\/span>1<\/span>)<\/span>
                  \ngo<\/span> func<\/span>(<\/span>i int<\/span>)<\/span> {<\/span>
                  \ndefer<\/span> wg.<\/span>Done<\/span>(<\/span>)<\/span>
                  \nkey :=<\/span> fmt.<\/span>Sprintf<\/span>(<\/span>"key_%d"<\/span>,<\/span> i)<\/span>
                  \nm.<\/span>Store<\/span>(<\/span>key,<\/span> i)<\/span>
                  \n}<\/span>(<\/span>i)<\/span>
                  \n}<\/span>
                  \nwg.<\/span>Wait<\/span>(<\/span>)<\/span>
                  \nfmt.<\/span>Println<\/span>(<\/span>"\u6240\u6709\u5199\u5165\u5b8c\u6210"<\/span>)<\/span><\/p>\n

                  \/\/ \u6a21\u62df\u5927\u91cf\u5e76\u53d1\u8bfb\u53d6<\/span>
                  \nfmt.<\/span>Println<\/span>(<\/span>"\\\\n\u5f00\u59cb\u5927\u91cf\u5e76\u53d1\u8bfb\u53d6…"<\/span>)<\/span>
                  \nfor<\/span> i :=<\/span> 0<\/span>;<\/span> i <<\/span> 10000<\/span>;<\/span> i++<\/span> {<\/span>
                  \nwg.<\/span>Add<\/span>(<\/span>1<\/span>)<\/span>
                  \ngo<\/span> func<\/span>(<\/span>i int<\/span>)<\/span> {<\/span>
                  \ndefer<\/span> wg.<\/span>Done<\/span>(<\/span>)<\/span>
                  \nkey :=<\/span> fmt.<\/span>Sprintf<\/span>(<\/span>"key_%d"<\/span>,<\/span> i)<\/span>
                  \nif<\/span> val,<\/span> ok :=<\/span> m.<\/span>Load<\/span>(<\/span>key)<\/span>;<\/span> ok {<\/span>
                  \n\/\/ fmt.Printf("Read key: %s, value: %v\\\\n", key, val)<\/span>
                  \n}<\/span>
                  \n}<\/span>(<\/span>i)<\/span>
                  \n}<\/span>
                  \nwg.<\/span>Wait<\/span>(<\/span>)<\/span>
                  \nfmt.<\/span>Println<\/span>(<\/span>"\u6240\u6709\u8bfb\u53d6\u5b8c\u6210"<\/span>)<\/span><\/p>\n

                  \/\/ \u4f7f\u7528 LoadOrStore<\/span>
                  \nfmt.<\/span>Println<\/span>(<\/span>"\\\\n\u6d4b\u8bd5 LoadOrStore…"<\/span>)<\/span>
                  \nactual,<\/span> loaded :=<\/span> m.<\/span>LoadOrStore<\/span>(<\/span>"key_100"<\/span>,<\/span> 9999<\/span>)<\/span>
                  \nfmt.<\/span>Printf<\/span>(<\/span>"key_100 \u7684\u503c: %v, \u662f\u5426\u5df2\u5b58\u5728: %t\\\\n"<\/span>,<\/span> actual,<\/span> loaded)<\/span> \/\/ \u5e94\u8be5\u8f93\u51fa true<\/span>
                  \nactual,<\/span> loaded =<\/span> m.<\/span>LoadOrStore<\/span>(<\/span>"new_key"<\/span>,<\/span> 12345<\/span>)<\/span>
                  \nfmt.<\/span>Printf<\/span>(<\/span>"new_key \u7684\u503c: %v, \u662f\u5426\u5df2\u5b58\u5728: %t\\\\n"<\/span>,<\/span> actual,<\/span> loaded)<\/span> \/\/ \u5e94\u8be5\u8f93\u51fa false<\/span><\/p>\n

                  \/\/ \u5220\u9664\u5143\u7d20<\/span>
                  \nm.<\/span>Delete<\/span>(<\/span>"key_0"<\/span>)<\/span>
                  \n_<\/span>,<\/span> ok :=<\/span> m.<\/span>Load<\/span>(<\/span>"key_0"<\/span>)<\/span>
                  \nfmt.<\/span>Printf<\/span>(<\/span>"key_0 \u5220\u9664\u540e\u662f\u5426\u5b58\u5728: %t\\\\n"<\/span>,<\/span> ok)<\/span> \/\/ \u5e94\u8be5\u8f93\u51fa false<\/span><\/p>\n

                  \/\/ \u904d\u5386 sync.Map<\/span>
                  \nfmt.<\/span>Println<\/span>(<\/span>"\\\\n\u904d\u5386 sync.Map (\u90e8\u5206\u8f93\u51fa):"<\/span>)<\/span>
                  \ncount :=<\/span> 0<\/span>
                  \nm.<\/span>Range<\/span>(<\/span>func<\/span>(<\/span>key,<\/span> value interface<\/span>{<\/span>}<\/span>)<\/span> bool<\/span> {<\/span>
                  \nfmt.<\/span>Printf<\/span>(<\/span>"\u952e: %v, \u503c: %v\\\\n"<\/span>,<\/span> key,<\/span> value)<\/span>
                  \ncount++<\/span>
                  \nreturn<\/span> count <<\/span> 5<\/span> \/\/ \u53ea\u6253\u5370\u524d5\u4e2a，\u907f\u514d\u8f93\u51fa\u8fc7\u591a<\/span>
                  \n}<\/span>)<\/span>
                  \nfmt.<\/span>Printf<\/span>(<\/span>"\u5171\u904d\u5386\u4e86 %d \u4e2a\u5143\u7d20 (\u53ef\u80fd\u4e0d\u5b8c\u6574，\u53d6\u51b3\u4e8e\u904d\u5386\u505c\u6b62\u6761\u4ef6)\\\\n"<\/span>,<\/span> count)<\/span>
                  \n}<\/span><\/p>\n

                  sync.Map \u7684\u9002\u7528\u573a\u666f\u548c\u9650\u5236：<\/p>\n

                    \n
                  • \u4f18\u52bf：\n
                      \n
                    • \u8bfb\u591a\u5199\u5c11\u573a\u666f\u6027\u80fd\u4f18\u8d8a： read map \u5141\u8bb8\u65e0\u9501\u5e76\u53d1\u8bfb\u53d6，\u51cf\u5c11\u4e86\u9501\u7ade\u4e89\u3002<\/li>\n
                    • \u51cf\u5c11 GC \u538b\u529b： \u907f\u514d\u9891\u7e41\u7684\u5783\u573e\u56de\u6536，\u56e0\u4e3a\u5927\u90e8\u5206\u8bfb\u64cd\u4f5c\u4e0d\u4f1a\u5bfc\u81f4 dirty map \u7684\u521b\u5efa\u3002<\/li>\n<\/ul>\n<\/li>\n
                    • \u52a3\u52bf：\n
                        \n
                      • \u5199\u591a\u573a\u666f\u6027\u80fd\u53ef\u80fd\u4e0d\u5982 RWMutex： \u6bcf\u6b21\u5199\u5165 dirty map \u90fd\u9700\u8981\u52a0\u9501，\u5e76\u4e14 dirty map \u7684\u63d0\u5347\u64cd\u4f5c\u4e5f\u4f1a\u6709\u5f00\u9500\u3002<\/li>\n
                      • \u5185\u5b58\u5360\u7528： \u7ef4\u62a4 read \u548c dirty \u4e24\u4e2a map \u53ef\u80fd\u4f1a\u5360\u7528\u66f4\u591a\u5185\u5b58\u3002<\/li>\n
                      • API \u9650\u5236： sync.Map \u4e0d\u652f\u6301\u901a\u8fc7 len() \u83b7\u53d6\u957f\u5ea6，\u4e5f\u4e0d\u652f\u6301 for…range \u8bed\u6cd5\u76f4\u63a5\u904d\u5386（\u9700\u8981\u4f7f\u7528 Range \u65b9\u6cd5\u5e76\u63d0\u4f9b\u56de\u8c03\u51fd\u6570），\u4e5f\u4e0d\u652f\u6301 nil \u503c\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                        \u603b\u7ed3： \u5728\u8003\u8651\u5e76\u53d1\u65f6，\u4f18\u5148\u4f7f\u7528 sync.RWMutex \u5c01\u88c5\u666e\u901a map，\u56e0\u4e3a\u5b83\u66f4\u901a\u7528\u4e14\u6613\u4e8e\u7406\u89e3\u3002\u53ea\u6709\u5728\u901a\u8fc7\u6027\u80fd\u6d4b\u8bd5\u53d1\u73b0 RWMutex \u6210\u4e3a\u74f6\u9888，\u5e76\u4e14\u660e\u786e\u4f60\u7684\u4f7f\u7528\u573a\u666f\u662f\u201c\u8bfb\u591a\u5199\u5c11\u201d\u65f6，\u624d\u8003\u8651\u4f7f\u7528 sync.Map\u3002<\/p>\n

                        \u603b\u7ed3<\/h4>\n

                        map \u662f Go \u8bed\u8a00\u4e2d\u4e00\u4e2a\u5f3a\u5927\u4e14\u5e38\u7528\u7684\u6570\u636e\u7ed3\u6784\u3002\u901a\u8fc7\u672c\u6587\u7684\u63a2\u8ba8，\u6211\u4eec\u4e86\u89e3\u5230：<\/p>\n

                          \n
                        • map \u7684\u57fa\u672c\u64cd\u4f5c\u5305\u62ec\u58f0\u660e\u3001\u521d\u59cb\u5316\u3001\u589e\u5220\u6539\u67e5\u548c\u904d\u5386\u3002<\/li>\n
                        • map \u7684\u5e95\u5c42\u57fa\u4e8e\u54c8\u5e0c\u8868\u5b9e\u73b0，\u6838\u5fc3\u7ed3\u6784\u662f hmap \u548c bmap（\u6876）\u3002<\/li>\n
                        • \u54c8\u5e0c\u51b2\u7a81\u901a\u8fc7\u94fe\u8868\u6cd5（overflow \u6ea2\u51fa\u6876）\u89e3\u51b3\u3002<\/li>\n
                        • map \u7684\u6269\u5bb9\u662f\u6e10\u8fdb\u5f0f\u7684，\u901a\u8fc7 oldbuckets \u548c buckets \u534f\u540c\u5de5\u4f5c，\u5c06\u6269\u5bb9\u5f00\u9500\u5206\u644a\u3002<\/li>\n
                        • Go \u5185\u7f6e map \u4e0d\u662f\u5e76\u53d1\u5b89\u5168\u7684，\u5e76\u53d1\u8bfb\u5199\u4f1a\u5bfc\u81f4\u6570\u636e\u7ade\u4e89\u3002<\/li>\n
                        • \u53ef\u4ee5\u901a\u8fc7 sync.RWMutex \u6765\u4fdd\u62a4 map \u7684\u5e76\u53d1\u5b89\u5168，\u6216\u8005\u5728\u201c\u8bfb\u591a\u5199\u5c11\u201d\u7684\u7279\u5b9a\u573a\u666f\u4e0b\u4f7f\u7528 sync.Map \u6765\u83b7\u53d6\u66f4\u597d\u7684\u6027\u80fd\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

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