{"id":89256,"date":"2026-08-02T18:56:55","date_gmt":"2026-08-02T10:56:55","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/89256.html"},"modified":"2026-08-02T18:56:55","modified_gmt":"2026-08-02T10:56:55","slug":"go-%e8%af%ad%e8%a8%80%e6%9d%a1%e4%bb%b6%e6%8e%a7%e5%88%b6%ef%bc%9aif-%e4%b8%8e-switch-%e7%9a%84%e6%b7%b1%e5%ba%a6%e8%a7%a3%e6%9e%90%e4%b8%8e%e6%9c%80%e4%bd%b3%e5%ae%9e%e8%b7%b5","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/89256.html","title":{"rendered":"Go \u8bed\u8a00\u6761\u4ef6\u63a7\u5236\uff1aif \u4e0e switch \u7684\u6df1\u5ea6\u89e3\u6790\u4e0e\u6700\u4f73\u5b9e\u8df5"},"content":{"rendered":"

\u5f15\u8a00<\/h3>\n

\u5728 Go \u8bed\u8a00\u4e2d，if \u548c switch \u662f\u4e24\u79cd\u6700\u57fa\u7840\u3001\u6700\u5e38\u7528\u7684\u6d41\u7a0b\u63a7\u5236\u8bed\u53e5\u3002\u5b83\u4eec\u770b\u4f3c\u7b80\u5355，\u4f46\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d，\u5982\u4f55\u6b63\u786e\u3001\u9ad8\u6548\u3001\u4f18\u96c5\u5730\u4f7f\u7528\u5b83\u4eec，\u5374\u76f4\u63a5\u5f71\u54cd\u7740\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u3001\u53ef\u7ef4\u62a4\u6027\u548c\u6027\u80fd\u3002\u8bb8\u591a\u5f00\u53d1\u8005，\u5c24\u5176\u662f\u4ece\u5176\u4ed6\u8bed\u8a00（\u5982 Java\u3001Python）\u8f6c\u6765\u7684\u5f00\u53d1\u8005，\u5bb9\u6613\u5c06\u539f\u6709\u4e60\u60ef\u5e26\u5165 Go，\u5199\u51fa\u4e0d\u7b26\u5408 Go \u8bed\u8a00\u54f2\u5b66\u6216\u5b58\u5728\u6f5c\u5728\u98ce\u9669\u7684\u4ee3\u7801\u3002<\/p>\n

\u672c\u6587\u5c06\u6df1\u5165\u63a2\u8ba8 Go \u8bed\u8a00\u4e2d if \u548c switch \u8bed\u53e5\u7684\u6838\u5fc3\u7279\u6027\u3001\u4f7f\u7528\u6280\u5de7\u3001\u5e38\u89c1\u9677\u9631\u4ee5\u53ca\u6700\u4f73\u5b9e\u8df5，\u5e2e\u52a9\u4f60\u5199\u51fa\u66f4\u5730\u9053\u7684 Go \u4ee3\u7801\u3002<\/p>\n

1. if \u8bed\u53e5：\u4e0d\u4ec5\u4ec5\u662f\u6761\u4ef6\u5224\u65ad<\/h3>\n

Go \u7684 if \u8bed\u53e5\u5728\u57fa\u7840\u8bed\u6cd5\u4e4b\u4e0a，\u63d0\u4f9b\u4e86\u7b80\u6d01\u53d8\u91cf\u58f0\u660e\u548c\u521d\u59cb\u5316\u8bed\u53e5，\u4f7f\u5176\u529f\u80fd\u66f4\u52a0\u5f3a\u5927\u3002<\/p>\n

1.1 \u57fa\u672c\u8bed\u6cd5\u4e0e\u53d8\u91cf\u4f5c\u7528\u57df<\/h4>\n

\/\/ \u6807\u51c6\u7528\u6cd5<\/span>
\nif<\/span> condition {<\/span>
\n \/\/ \u6267\u884c\u8bed\u53e5<\/span>
\n}<\/span><\/p>\n

\/\/ \u5e26\u521d\u59cb\u5316\u8bed\u53e5\u7684 if<\/span>
\nif<\/span> initialization;<\/span> condition {<\/span>
\n \/\/ \u6267\u884c\u8bed\u53e5<\/span>
\n}<\/span><\/p>\n

\u6ce8\u610f\u4e8b\u9879 1：\u521d\u59cb\u5316\u8bed\u53e5\u4e2d\u58f0\u660e\u7684\u53d8\u91cf\u4f5c\u7528\u57df\u4ec5\u9650\u4e8e\u8be5 if-else \u5757\u3002<\/p>\n

if<\/span> err :=<\/span> someFunction<\/span>(<\/span>)<\/span>;<\/span> err !=<\/span> nil<\/span> {<\/span>
\n \/\/ \u8fd9\u91cc\u53ef\u4ee5\u8bbf\u95ee err<\/span>
\n log.<\/span>Printf<\/span>(<\/span>"\u64cd\u4f5c\u5931\u8d25: %v"<\/span>,<\/span> err)<\/span>
\n}<\/span>
\n\/\/ \u8fd9\u91cc\u65e0\u6cd5\u8bbf\u95ee err，\u7f16\u8bd1\u9519\u8bef：undefined: err<\/span>
\n\/\/ fmt.Println(err)<\/span><\/p>\n

\u8fd9\u79cd\u8bbe\u8ba1\u5f3a\u5236\u4f60\u5c06\u53d8\u91cf\u7684\u751f\u547d\u5468\u671f\u9650\u5236\u5728\u6700\u5c0f\u8303\u56f4\u5185，\u51cf\u5c11\u4e86\u547d\u540d\u51b2\u7a81\u548c\u610f\u5916\u4fee\u6539\u7684\u98ce\u9669，\u662f Go \u8bed\u8a00\u201c\u4f5c\u7528\u57df\u6700\u5c0f\u5316\u201d\u539f\u5219\u7684\u4f53\u73b0\u3002<\/p>\n

1.2 \u907f\u514d\u5d4c\u5957\u8fc7\u6df1<\/h4>\n

\u591a\u5c42\u5d4c\u5957\u7684 if \u8bed\u53e5\u662f\u4ee3\u7801\u53ef\u8bfb\u6027\u7684\u201c\u6740\u624b\u201d\u3002<\/p>\n

\u53cd\u9762\u793a\u4f8b：<\/p>\n

func<\/span> processUser<\/span>(<\/span>input string<\/span>)<\/span> error<\/span> {<\/span>
\n if<\/span> input !=<\/span> ""<\/span> {<\/span>
\n user,<\/span> err :=<\/span> getUser<\/span>(<\/span>input)<\/span>
\n if<\/span> err ==<\/span> nil<\/span> {<\/span>
\n if<\/span> user.<\/span>IsActive {<\/span>
\n result,<\/span> err :=<\/span> process<\/span>(<\/span>user)<\/span>
\n if<\/span> err !=<\/span> nil<\/span> {<\/span>
\n return<\/span> fmt.<\/span>Errorf<\/span>(<\/span>"\u5904\u7406\u5931\u8d25: %w"<\/span>,<\/span> err)<\/span>
\n }<\/span>
\n \/\/ … \u66f4\u591a\u5d4c\u5957<\/span>
\n }<\/span> else<\/span> {<\/span>
\n return<\/span> errors.<\/span>New<\/span>(<\/span>"\u7528\u6237\u672a\u6fc0\u6d3b"<\/span>)<\/span>
\n }<\/span>
\n }<\/span> else<\/span> {<\/span>
\n return<\/span> fmt.<\/span>Errorf<\/span>(<\/span>"\u83b7\u53d6\u7528\u6237\u5931\u8d25: %w"<\/span>,<\/span> err)<\/span>
\n }<\/span>
\n }<\/span> else<\/span> {<\/span>
\n return<\/span> errors.<\/span>New<\/span>(<\/span>"\u8f93\u5165\u4e0d\u80fd\u4e3a\u7a7a"<\/span>)<\/span>
\n }<\/span>
\n return<\/span> nil<\/span>
\n}<\/span><\/p>\n

\u4f18\u5316\u7b56\u7565：\u536b\u8bed\u53e5（Guard Clauses）\u4e0e\u63d0\u524d\u8fd4\u56de
\n\u5c3d\u65e9\u5904\u7406\u9519\u8bef\u548c\u8fb9\u754c\u60c5\u51b5，\u8ba9\u4e3b\u903b\u8f91\u8def\u5f84\u6e05\u6670\u3002<\/p>\n

func<\/span> processUserOptimized<\/span>(<\/span>input string<\/span>)<\/span> error<\/span> {<\/span>
\n \/\/ \u536b\u8bed\u53e51：\u68c0\u67e5\u8f93\u5165<\/span>
\n if<\/span> input ==<\/span> ""<\/span> {<\/span>
\n return<\/span> errors.<\/span>New<\/span>(<\/span>"\u8f93\u5165\u4e0d\u80fd\u4e3a\u7a7a"<\/span>)<\/span>
\n }<\/span><\/p>\n

\/\/ \u536b\u8bed\u53e52：\u83b7\u53d6\u8d44\u6e90<\/span>
\n user,<\/span> err :=<\/span> getUser<\/span>(<\/span>input)<\/span>
\n if<\/span> err !=<\/span> nil<\/span> {<\/span>
\n return<\/span> fmt.<\/span>Errorf<\/span>(<\/span>"\u83b7\u53d6\u7528\u6237\u5931\u8d25: %w"<\/span>,<\/span> err)<\/span>
\n }<\/span><\/p>\n

\/\/ \u536b\u8bed\u53e53：\u68c0\u67e5\u72b6\u6001<\/span>
\n if<\/span> !<\/span>user.<\/span>IsActive {<\/span>
\n return<\/span> errors.<\/span>New<\/span>(<\/span>"\u7528\u6237\u672a\u6fc0\u6d3b"<\/span>)<\/span>
\n }<\/span><\/p>\n

\/\/ \u4e3b\u903b\u8f91\u8def\u5f84，\u65e0\u9700\u5d4c\u5957<\/span>
\n result,<\/span> err :=<\/span> process<\/span>(<\/span>user)<\/span>
\n if<\/span> err !=<\/span> nil<\/span> {<\/span>
\n return<\/span> fmt.<\/span>Errorf<\/span>(<\/span>"\u5904\u7406\u5931\u8d25: %w"<\/span>,<\/span> err)<\/span>
\n }<\/span><\/p>\n

\/\/ \u7ee7\u7eed\u6e05\u6670\u7684\u4e3b\u903b\u8f91…<\/span>
\n fmt.<\/span>Println<\/span>(<\/span>"\u5904\u7406\u6210\u529f:"<\/span>,<\/span> result)<\/span>
\n return<\/span> nil<\/span>
\n}<\/span><\/p>\n

1.3 \u5584\u7528 if \u7684\u7b80\u6d01\u8d4b\u503c\u5904\u7406\u9519\u8bef<\/h4>\n

Go \u7684\u9519\u8bef\u5904\u7406\u54f2\u5b66\u9f13\u52b1\u5373\u65f6\u5904\u7406\u9519\u8bef\u3002<\/p>\n

\/\/ \u5e38\u89c1\u6a21\u5f0f<\/span>
\nif<\/span> err :=<\/span> doSomething<\/span>(<\/span>)<\/span>;<\/span> err !=<\/span> nil<\/span> {<\/span>
\n \/\/ \u7acb\u5373\u5904\u7406\u9519\u8bef，\u53ef\u4ee5\u6dfb\u52a0\u4e0a\u4e0b\u6587\u4fe1\u606f<\/span>
\n return<\/span> fmt.<\/span>Errorf<\/span>(<\/span>"doSomething failed: %w"<\/span>,<\/span> err)<\/span>
\n}<\/span>
\n\/\/ \u7ee7\u7eed\u6267\u884c，\u6b64\u65f6\u53ef\u4ee5\u786e\u4fe1 err \u4e3a nil<\/span><\/p>\n

\u6ce8\u610f\u4e8b\u9879 2：\u907f\u514d\u5728 if \u5757\u5916\u4f7f\u7528\u521d\u59cb\u5316\u8bed\u53e5\u4e2d\u58f0\u660e\u7684\u53d8\u91cf\u3002 \u8fd9\u4f1a\u5bfc\u81f4\u7f16\u8bd1\u9519\u8bef，\u5982\u524d\u6240\u8ff0\u3002<\/p>\n

2. switch \u8bed\u53e5：\u6bd4\u4f60\u60f3\u7684\u66f4\u5f3a\u5927<\/h3>\n

Go \u7684 switch \u8bed\u53e5\u975e\u5e38\u7075\u6d3b，\u5b83\u4e0d\u4ec5\u662f if-else if \u94fe\u7684\u8bed\u6cd5\u7cd6，\u8fd8\u62e5\u6709\u72ec\u7279\u7684\u201c\u65e0\u6807\u7b7e fallthrough\u201d\u548c\u7c7b\u578b\u5f00\u5173\u7b49\u7279\u6027\u3002<\/p>\n

2.1 \u8868\u8fbe\u5f0f\u5f00\u5173 vs \u7c7b\u578b\u5f00\u5173<\/h4>\n

\u8868\u8fbe\u5f0f\u5f00\u5173： \u5bf9\u8868\u8fbe\u5f0f\u7684\u503c\u8fdb\u884c\u5339\u914d\u3002<\/p>\n

func<\/span> getStatusMessage<\/span>(<\/span>code int<\/span>)<\/span> string<\/span> {<\/span>
\n switch<\/span> code {<\/span>
\n case<\/span> 200<\/span>:<\/span>
\n return<\/span> "OK"<\/span>
\n case<\/span> 404<\/span>:<\/span>
\n return<\/span> "Not Found"<\/span>
\n case<\/span> 500<\/span>:<\/span>
\n return<\/span> "Internal Server Error"<\/span>
\n default<\/span>:<\/span>
\n return<\/span> "Unknown Status"<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

\u7c7b\u578b\u5f00\u5173： \u7528\u4e8e\u63a5\u53e3\u503c\u7684\u7c7b\u578b\u5224\u65ad，\u662f Go \u53cd\u5c04\u7684\u4e00\u79cd\u8f7b\u91cf\u7ea7\u5e94\u7528\u3002<\/p>\n

func<\/span> describe<\/span>(<\/span>i interface<\/span>{<\/span>}<\/span>)<\/span> string<\/span> {<\/span>
\n switch<\/span> v :=<\/span> i.<\/span>(<\/span>type<\/span>)<\/span> {<\/span>
\n case<\/span> int<\/span>:<\/span>
\n return<\/span> fmt.<\/span>Sprintf<\/span>(<\/span>"\u6574\u6570: %d"<\/span>,<\/span> v)<\/span>
\n case<\/span> string<\/span>:<\/span>
\n return<\/span> fmt.<\/span>Sprintf<\/span>(<\/span>"\u5b57\u7b26\u4e32，\u957f\u5ea6: %d"<\/span>,<\/span> len<\/span>(<\/span>v)<\/span>)<\/span>
\n case<\/span> bool<\/span>:<\/span>
\n if<\/span> v {<\/span>
\n return<\/span> "\u5e03\u5c14\u503c: true"<\/span>
\n }<\/span>
\n return<\/span> "\u5e03\u5c14\u503c: false"<\/span>
\n default<\/span>:<\/span>
\n return<\/span> fmt.<\/span>Sprintf<\/span>(<\/span>"\u672a\u77e5\u7c7b\u578b: %T"<\/span>,<\/span> v)<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

2.2 fallthrough \u7684\u8c28\u614e\u4f7f\u7528<\/h4>\n

\u5728 Go \u7684 switch \u4e2d，\u6bcf\u4e2a case \u9ed8\u8ba4\u81ea\u52a8 break\u3002\u5982\u679c\u9700\u8981\u6267\u884c\u4e0b\u4e00\u4e2a case，\u5fc5\u987b\u663e\u5f0f\u4f7f\u7528 fallthrough \u5173\u952e\u5b57\u3002<\/p>\n

score :=<\/span> 85<\/span>
\nvar<\/span> grade string<\/span><\/p>\n

switch<\/span> {<\/span>
\ncase<\/span> score >=<\/span> 90<\/span>:<\/span>
\n grade =<\/span> "A"<\/span>
\n fallthrough<\/span> \/\/ \u9519\u8bef\u7528\u6cd5！\u8fd9\u4f1a\u4f7f\u5f97 score>=90 \u65f6\u4e5f\u6267\u884c case score >= 80<\/span>
\ncase<\/span> score >=<\/span> 80<\/span>:<\/span>
\n grade =<\/span> "B"<\/span> \/\/ \u8fd9\u4f1a\u8986\u76d6\u6389 A<\/span>
\ncase<\/span> score >=<\/span> 70<\/span>:<\/span>
\n grade =<\/span> "C"<\/span>
\ndefault<\/span>:<\/span>
\n grade =<\/span> "D"<\/span>
\n}<\/span>
\nfmt.<\/span>Println<\/span>(<\/span>grade)<\/span> \/\/ \u8f93\u51fa B，\u903b\u8f91\u9519\u8bef！<\/span><\/p>\n

\u6ce8\u610f\u4e8b\u9879 3：fallthrough \u4f1a\u65e0\u89c6\u4e0b\u4e00\u4e2a case \u7684\u6761\u4ef6，\u76f4\u63a5\u6267\u884c\u5176\u4ee3\u7801\u5757\u3002 \u5b83\u901a\u5e38\u53ea\u7528\u4e8e\u9700\u8981\u591a\u4e2a case \u5171\u4eab\u540c\u4e00\u6bb5\u5904\u7406\u903b\u8f91\u7684\u7279\u5b9a\u573a\u666f，\u5e76\u4e14\u8fd9\u4e9b case \u662f\u8fde\u7eed\u7684\u3002<\/p>\n

\u6b63\u786e\u4f7f\u7528 fallthrough \u7684\u793a\u4f8b（\u8f83\u5c11\u89c1）：<\/p>\n

switch<\/span> command {<\/span>
\ncase<\/span> "start"<\/span>,<\/span> "run"<\/span>:<\/span> \/\/ \u591a\u4e2a\u6761\u4ef6\u53ef\u4ee5\u7528\u9017\u53f7\u5206\u9694<\/span>
\n fmt.<\/span>Println<\/span>(<\/span>"\u542f\u52a8\u8fdb\u7a0b…"<\/span>)<\/span>
\n \/\/ start \u548c run \u5171\u4eab\u542f\u52a8\u903b\u8f91<\/span>
\n fallthrough<\/span> \/\/ \u7ee7\u7eed\u6267\u884c\u201c\u8bb0\u5f55\u65e5\u5fd7\u201d\u7684\u903b\u8f91<\/span>
\ncase<\/span> "log"<\/span>:<\/span>
\n fmt.<\/span>Println<\/span>(<\/span>"\u8bb0\u5f55\u64cd\u4f5c\u65e5\u5fd7…"<\/span>)<\/span>
\n \/\/ \u8fd9\u91cc\u6ca1\u6709 fallthrough，\u81ea\u52a8 break<\/span>
\ncase<\/span> "stop"<\/span>:<\/span>
\n fmt.<\/span>Println<\/span>(<\/span>"\u505c\u6b62\u8fdb\u7a0b…"<\/span>)<\/span>
\ndefault<\/span>:<\/span>
\n fmt.<\/span>Println<\/span>(<\/span>"\u672a\u77e5\u547d\u4ee4"<\/span>)<\/span>
\n}<\/span><\/p>\n

2.3 \u65e0\u8868\u8fbe\u5f0f\u7684 switch (switch true)<\/h4>\n

\u5f53 switch \u540e\u6ca1\u6709\u8868\u8fbe\u5f0f\u65f6，\u76f8\u5f53\u4e8e switch true，\u6bcf\u4e2a case \u6761\u4ef6\u90fd\u4e3a\u5e03\u5c14\u8868\u8fbe\u5f0f\u3002\u8fd9\u53ef\u4ee5\u66ff\u4ee3\u590d\u6742\u7684 if-else if \u94fe，\u4f7f\u903b\u8f91\u66f4\u6e05\u6670\u3002<\/p>\n

\/\/ \u4f7f\u7528 if-else if<\/span>
\nif<\/span> length ><\/span> 100<\/span> {<\/span>
\n fmt.<\/span>Println<\/span>(<\/span>"\u5f88\u957f"<\/span>)<\/span>
\n}<\/span> else<\/span> if<\/span> length ><\/span> 50<\/span> {<\/span>
\n fmt.<\/span>Println<\/span>(<\/span>"\u4e2d\u7b49"<\/span>)<\/span>
\n}<\/span> else<\/span> if<\/span> length ><\/span> 10<\/span> {<\/span>
\n fmt.<\/span>Println<\/span>(<\/span>"\u8f83\u77ed"<\/span>)<\/span>
\n}<\/span> else<\/span> {<\/span>
\n fmt.<\/span>Println<\/span>(<\/span>"\u5f88\u77ed"<\/span>)<\/span>
\n}<\/span><\/p>\n

\/\/ \u4f7f\u7528 switch（\u66f4\u6e05\u6670）<\/span>
\nswitch<\/span> {<\/span>
\ncase<\/span> length ><\/span> 100<\/span>:<\/span>
\n fmt.<\/span>Println<\/span>(<\/span>"\u5f88\u957f"<\/span>)<\/span>
\ncase<\/span> length ><\/span> 50<\/span>:<\/span>
\n fmt.<\/span>Println<\/span>(<\/span>"\u4e2d\u7b49"<\/span>)<\/span>
\ncase<\/span> length ><\/span> 10<\/span>:<\/span>
\n fmt.<\/span>Println<\/span>(<\/span>"\u8f83\u77ed"<\/span>)<\/span>
\ndefault<\/span>:<\/span>
\n fmt.<\/span>Println<\/span>(<\/span>"\u5f88\u77ed"<\/span>)<\/span>
\n}<\/span><\/p>\n

3. if \u4e0e switch \u7684\u9009\u62e9\u7b56\u7565<\/h3>\n

\u5982\u4f55\u51b3\u5b9a\u4f7f\u7528 if \u8fd8\u662f switch？\u4ee5\u4e0b\u662f\u4e00\u4e9b\u6307\u5bfc\u539f\u5219：<\/p>\n\n\u573a\u666f\u63a8\u8350\u7406\u7531<\/tr>\n\n\n\n\n\n\n
\u7b80\u5355\u7684\u4e8c\u9009\u4e00\u6761\u4ef6<\/td>\nif-else<\/td>\n\u76f4\u89c2，\u4ee3\u7801\u91cf\u5c11\u3002<\/td>\n<\/tr>\n
\u57fa\u4e8e\u5355\u4e2a\u53d8\u91cf\u7684\u591a\u4e2a\u79bb\u6563\u503c\u5224\u65ad<\/td>\nswitch<\/td>\n\u7ed3\u6784\u6e05\u6670，\u6613\u4e8e\u6269\u5c55\u65b0 case\u3002<\/td>\n<\/tr>\n
\u591a\u4e2a\u72ec\u7acb\u7684\u6761\u4ef6\u5224\u65ad<\/td>\nif-else if \u6216 switch true<\/td>\n\u5982\u679c\u6761\u4ef6\u590d\u6742\u4e14\u65e0\u5173\u8054，if \u53ef\u80fd\u66f4\u76f4\u63a5；\u5982\u679c\u662f\u4e00\u7cfb\u5217\u8303\u56f4\u6216\u5e03\u5c14\u68c0\u67e5，switch true \u66f4\u6574\u9f50\u3002<\/td>\n<\/tr>\n
\u7c7b\u578b\u5224\u65ad<\/td>\n\u7c7b\u578b switch<\/td>\n\u8fd9\u662f\u7c7b\u578b switch \u7684\u4e13\u5c5e\u9886\u57df，\u65e0\u6cd5\u7528 if \u7b80\u6d01\u5b9e\u73b0\u3002<\/td>\n<\/tr>\n
\u9700\u8981\u6267\u884c\u5230\u4e0b\u4e00\u4e2a case<\/td>\nswitch + fallthrough<\/td>\nif \u65e0\u6cd5\u76f4\u63a5\u5b9e\u73b0\u6b64\u8bed\u4e49\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u7b80\u5355\u6cd5\u5219： \u5f53\u5224\u65ad\u6761\u4ef6\u662f\u201c\u8fd9\u4e2a\u53d8\u91cf\u7b49\u4e8eA\u3001B\u8fd8\u662fC？\u201d\u65f6，\u7528 switch；\u5f53\u5224\u65ad\u6761\u4ef6\u662f\u201c\u8fd9\u4e2a\u6761\u4ef6\u6210\u7acb\u5417？\u4e0d\u6210\u7acb\u7684\u8bdd，\u90a3\u4e2a\u6761\u4ef6\u6210\u7acb\u5417？\u201d\u65f6，\u7528 if-else if\u3002<\/p>\n

4. \u6027\u80fd\u4e0e\u53ef\u8bfb\u6027\u7684\u6743\u8861<\/h3>\n

\u5728\u7edd\u5927\u591a\u6570\u60c5\u51b5\u4e0b，if \u548c switch \u7684\u6027\u80fd\u5dee\u5f02\u5fae\u4e4e\u5176\u5fae，\u7f16\u8bd1\u5668\u4f1a\u8fdb\u884c\u4f18\u5316\u3002\u9009\u62e9\u7684\u5173\u952e\u5728\u4e8e\u53ef\u8bfb\u6027\u548c\u7ef4\u62a4\u6027\u3002<\/p>\n

    \n
  • \u53ef\u8bfb\u6027： switch \u8bed\u53e5\u5c06\u6240\u6709\u7684\u5206\u652f\u9009\u9879\u5e76\u5217\u5c55\u793a，\u4e00\u76ee\u4e86\u7136\u3002\u65b0\u589e\u4e00\u4e2a case \u901a\u5e38\u6bd4\u5728 if-else if \u94fe\u4e2d\u95f4\u63d2\u5165\u4e00\u4e2a\u6761\u4ef6\u66f4\u4e0d\u5bb9\u6613\u51fa\u9519\u3002<\/li>\n
  • \u7ef4\u62a4\u6027： \u5f53\u5206\u652f\u903b\u8f91\u590d\u6742，\u6bcf\u4e2a\u5206\u652f\u5185\u90e8\u4ee3\u7801\u8f83\u591a\u65f6，switch \u7684\u4ee3\u7801\u5757\u9694\u79bb\u6027\u66f4\u597d\u3002<\/li>\n<\/ul>\n

    5. \u5e38\u89c1\u9677\u9631\u4e0e\u6700\u4f73\u5b9e\u8df5\u603b\u7ed3<\/h3>\n

    \u9677\u9631<\/h4>\n
  • if \u521d\u59cb\u5316\u53d8\u91cf\u4f5c\u7528\u57df\u6df7\u6dc6： \u8bef\u5728 if \u5757\u5916\u4f7f\u7528\u521d\u59cb\u5316\u53d8\u91cf\u3002<\/li>\n
  • switch \u4e2d\u8bef\u7528 fallthrough： \u5bfc\u81f4\u975e\u9884\u671f\u7684\u903b\u8f91\u6267\u884c\u3002<\/li>\n
  • \u5197\u4f59\u7684 else： \u5728\u5df2\u7ecf return \u6216 break \u7684 if \u5757\u540e，\u4e0d\u5fc5\u8981\u7684 else \u4f1a\u589e\u52a0\u7f29\u8fdb\u3002\/\/ \u5197\u4f59<\/span>
    \nif<\/span> err !=<\/span> nil<\/span> {<\/span>
    \n return<\/span> err
    \n}<\/span> else<\/span> {<\/span>
    \n \/\/ \u4e3b\u903b\u8f91<\/span>
    \n}<\/span>
    \n\/\/ \u4f18\u5316\u540e<\/span>
    \nif<\/span> err !=<\/span> nil<\/span> {<\/span>
    \n return<\/span> err
    \n}<\/span>
    \n\/\/ \u4e3b\u903b\u8f91<\/span><\/p>\n<\/li>\n
  • \u5ffd\u7565 default case： \u5728 switch \u4e2d，\u5373\u4f7f\u4f60\u8ba4\u4e3a\u6240\u6709\u60c5\u51b5\u90fd\u5df2\u8986\u76d6，\u52a0\u4e0a default \u4e5f\u662f\u4e00\u4e2a\u597d\u4e60\u60ef，\u53ef\u4ee5\u5904\u7406\u672a\u77e5\u6216\u672a\u6765\u7684\u503c\u3002<\/li>\n

    \u6700\u4f73\u5b9e\u8df5<\/h4>\n
  • \u4f7f\u7528\u536b\u8bed\u53e5\u7b80\u5316\u5d4c\u5957，\u63d0\u5347\u4ee3\u7801\u6e05\u6670\u5ea6\u3002<\/li>\n
  • \u9650\u5236 if \u521d\u59cb\u5316\u8bed\u53e5\u7684\u590d\u6742\u5ea6，\u5982\u679c\u521d\u59cb\u5316\u903b\u8f91\u5f88\u590d\u6742，\u5148\u5728\u5916\u9762\u5199\u597d\u3002<\/li>\n
  • switch \u7684 case \u53ef\u4ee5\u5305\u542b\u591a\u4e2a\u503c，\u7528\u9017\u53f7\u5206\u9694\u3002<\/li>\n
  • \u5229\u7528\u7c7b\u578b switch \u8fdb\u884c\u5b89\u5168\u7684\u7c7b\u578b\u65ad\u8a00\u548c\u5206\u652f\u5904\u7406\u3002<\/li>\n
  • \u59cb\u7ec8\u8003\u8651\u53ef\u8bfb\u6027，\u5c06\u590d\u6742\u7684\u6761\u4ef6\u5224\u65ad\u5c01\u88c5\u6210\u547d\u540d\u6e05\u6670\u7684\u5e03\u5c14\u51fd\u6570\u6216\u53d8\u91cf\u3002\/\/ \u4e0d\u63a8\u8350<\/span>
    \nif<\/span> user.<\/span>Age >=<\/span> 18<\/span> &&<\/span> user.<\/span>Country ==<\/span> "US"<\/span> &&<\/span> !<\/span>user.<\/span>IsSuspended {<\/span>
    \n \/\/ …<\/span>
    \n}<\/span>
    \n\/\/ \u63a8\u8350<\/span>
    \nisEligible :=<\/span> user.<\/span>Age >=<\/span> 18<\/span> &&<\/span> user.<\/span>Country ==<\/span> "US"<\/span> &&<\/span> !<\/span>user.<\/span>IsSuspended
    \nif<\/span> isEligible {<\/span>
    \n \/\/ …<\/span>
    \n}<\/span>
    \n\/\/ \u6216\u8005\u5c01\u88c5\u6210\u65b9\u6cd5<\/span>
    \nif<\/span> user.<\/span>IsEligibleForService<\/span>(<\/span>)<\/span> {<\/span>
    \n \/\/ …<\/span>
    \n}<\/span><\/p>\n<\/li>\n

    \u7ed3\u8bed<\/h3>\n

    if \u548c switch \u662f Go \u7a0b\u5e8f\u5458\u65e5\u5e38\u5de5\u4f5c\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u5de5\u5177\u3002\u6df1\u5165\u7406\u89e3\u5b83\u4eec\u7684\u8bbe\u8ba1\u7406\u5ff5\u3001\u4f5c\u7528\u57df\u89c4\u5219\u548c\u7ec6\u5fae\u5dee\u522b，\u80fd\u591f\u5e2e\u52a9\u4f60\u907f\u514d\u5e38\u89c1\u7684\u9519\u8bef，\u5e76\u5199\u51fa\u66f4\u7b80\u6d01\u3001\u5065\u58ee\u548c\u6613\u4e8e\u7406\u89e3\u7684\u4ee3\u7801\u3002\u8bb0\u4f4f，\u6ca1\u6709\u7edd\u5bf9\u6700\u4f18\u7684\u9009\u62e9，\u53ea\u6709\u6700\u9002\u5408\u5f53\u524d\u573a\u666f\u548c\u56e2\u961f\u4e60\u60ef\u7684\u5199\u6cd5\u3002\u5728\u6e05\u6670\u3001\u7b80\u5355\u548c\u76f4\u63a5\u8fd9\u6761 Go \u8bed\u8a00\u5021\u5bfc\u7684\u9053\u8def\u4e0a，\u5408\u7406\u5730\u8fd0\u7528 if \u548c switch，\u5c06\u4f7f\u4f60\u7684\u4ee3\u7801\u8d28\u91cf\u66f4\u4e0a\u4e00\u5c42\u697c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

    \u5f15\u8a00
    \n\u5728 Go \u8bed\u8a00\u4e2d，if \u548c switch \u662f\u4e24\u79cd\u6700\u57fa\u7840\u3001\u6700\u5e38\u7528\u7684\u6d41\u7a0b\u63a7\u5236\u8bed\u53e5\u3002\u5b83\u4eec\u770b\u4f3c\u7b80\u5355，\u4f46\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d，\u5982\u4f55\u6b63\u786e\u3001\u9ad8\u6548\u3001\u4f18\u96c5\u5730\u4f7f\u7528\u5b83\u4eec，\u5374\u76f4\u63a5\u5f71\u54cd\u7740\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u3001\u53ef\u7ef4\u62a4\u6027\u548c\u6027\u80fd\u3002\u8bb8\u591a\u5f00\u53d1\u8005，\u5c24\u5176\u662f\u4ece\u5176\u4ed6\u8bed\u8a00（\u5982 Java\u3001Python）\u8f6c\u6765\u7684\u5f00\u53d1\u8005，\u5bb9\u6613\u5c06\u539f\u6709\u4e60\u60ef\u5e26\u5165 Go，\u5199\u51fa\u4e0d\u7b26\u5408 Go \u8bed\u8a00\u54f2\u5b66\u6216\u5b58\u5728\u6f5c\u5728\u98ce\u9669\u7684\u4ee3\u7801\u3002
    \n\u672c\u6587\u5c06\u6df1\u5165\u63a2\u8ba8 G<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[746,292,190],"topic":[],"class_list":["post-89256","post","type-post","status-publish","format-standard","hentry","category-server","tag-golang","tag-292","tag-190"],"yoast_head":"\nGo \u8bed\u8a00\u6761\u4ef6\u63a7\u5236\uff1aif \u4e0e switch \u7684\u6df1\u5ea6\u89e3\u6790\u4e0e\u6700\u4f73\u5b9e\u8df5 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/89256.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Go \u8bed\u8a00\u6761\u4ef6\u63a7\u5236\uff1aif \u4e0e switch \u7684\u6df1\u5ea6\u89e3\u6790\u4e0e\u6700\u4f73\u5b9e\u8df5 - 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