{"id":207416,"date":"2025-07-08T11:50:36","date_gmt":"2025-07-08T03:50:36","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207416\/"},"modified":"2025-07-08T11:50:36","modified_gmt":"2025-07-08T03:50:36","slug":"%e4%b8%ba%e4%bb%80%e4%b9%88%e5%9c%a8-go-%e7%b1%bb%e5%9e%8b-switch-%e4%b8%ad%e5%a3%b0%e6%98%8e%e4%b8%80%e4%b8%aa%e5%8d%95%e7%8b%ac%e7%9a%84%e5%8f%98%e9%87%8f%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207416\/","title":{"rendered":"\u4e3a\u4ec0\u4e48\u5728 Go \u7c7b\u578b switch \u4e2d\u58f0\u660e\u4e00\u4e2a\u5355\u72ec\u7684\u53d8\u91cf\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<p>\u5f53\u524d\u4f4d\u7f6e\uff1a <span>&gt;<\/span> <span>&gt;<\/span> <span>&gt;<\/span> <span>&gt;<\/span> <span>\u4e3a\u4ec0\u4e48\u5728 Go \u7c7b\u578b switch \u4e2d\u58f0\u660e\u4e00\u4e2a\u5355\u72ec\u7684\u53d8\u91cf\uff1f<\/span><\/p>\n<p><span>\u6765\u6e90\uff1astackoverflow<\/span><br \/>\n<span>2024-04-22 13:51:34<\/span><br \/>\n<span><i><\/i>0\u6d4f\u89c8<\/span><br \/>\n<span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> <\/p>\n<p>\u5927\u5bb6\u597d\uff0c\u4eca\u5929\u672c\u4eba\u7ed9\u5927\u5bb6\u5e26\u6765\u6587\u7ae0<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300a\u4e3a\u4ec0\u4e48\u5728 Go \u7c7b\u578b switch \u4e2d\u58f0\u660e\u4e00\u4e2a\u5355\u72ec\u7684\u53d8\u91cf\uff1f\u300b<\/span>\uff0c\u6587\u4e2d\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span><\/span>\uff0c\u5982\u679c\u4f60\u5bf9<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">Golang<\/span>\u65b9\u9762\u7684\u77e5\u8bc6\u70b9\u611f\u5174\u8da3\uff0c\u90a3\u5c31\u8bf7\u5404\u4f4d\u670b\u53cb\u7ee7\u7eed\u770b\u4e0b\u53bb\u5427~\u5e0c\u671b\u80fd\u771f\u6b63\u5e2e\u5230\u4f60\u4eec\uff0c\u8c22\u8c22\uff01<\/p>\n<p> \u95ee\u9898\u5185\u5bb9<br \/>\n <\/p>\n<p>\u6211\u65e0\u6cd5\u7406\u89e3\u4e3a\u4ec0\u4e48\u7c7b\u578b\u5f00\u5173\u662f\u7528 switch \u8bed\u53e5\u4e2d\u5b9a\u4e49\u7684\u9644\u52a0\u53d8\u91cf\u7f16\u5199\u7684\u3002\u4e0b\u9762\u7684\u4ee3\u7801\u4f3c\u4e4e\u662f\u7ecf\u8fc7\u6279\u51c6\u7684\u505a\u4e8b\u65b9\u5f0f\uff1a<\/p>\n<pre>func test_func(i interface{}) {\n    switch v := i.(type) {\n    case int:\n        fmt.printf(\"%t\\n\", v)\n    case float64:\n        fmt.printf(\"%t\\n\", v)\n    case int:\n        fmt.printf(\"i don't know about type %t!\\n\", v)\n    }\n}\n\nfunc main() {\n    test_func(float64(34))\n    test_func(int(34))\n    test_func(\"hello world\")\n}<\/pre>\n<p>\u6b63\u5982\u9884\u671f\u7684\u90a3\u6837\uff0c\u8fd4\u56de\uff1a<\/p>\n<pre>float64\nint\ni don't know about type string!<\/pre>\n<p>\u4f46\u662f\uff0c\u6211\u53ef\u4ee5\u7a0d\u5fae\u66f4\u6539 <code>test_func<\/code>\uff0c\u4ee5\u4fbf <code>v<\/code> \u4e0d\u5728 <code>switch<\/code> \u8bed\u53e5\u4e2d\u5b9a\u4e49\uff0c\u800c\u662f\u5728 case \u8bed\u53e5\u4e2d\u4f7f\u7528 <code>i<\/code>\uff1a<\/p>\n<pre>func test_func(i interface{}) {\n    switch i.(type) {\n    case int:\n        fmt.Printf(\"%T\\n\", i)\n    case float64:\n        fmt.Printf(\"%T\\n\", i)\n    case int:\n        fmt.Printf(\"I don't know about type %T!\\n\", i)\n    }\n}\n\nfunc main() {\n    test_func(float64(34))\n    test_func(int(34))\n    test_func(\"hello world\")\n}<\/pre>\n<p>\u5e76\u4e14\u8f93\u51fa\u6ca1\u6709\u6539\u53d8\u3002\u770b\u6765\u8fd9\u4e24\u79cd\u5f62\u5f0f\u662f\u53ef\u4ee5\u4e92\u6362\u7684\u3002\u5f53\u6211\u53ef\u4ee5\u53ea\u4f7f\u7528 <code>i<\/code> \u65f6\uff0c\u4e3a\u4ec0\u4e48\u8fd8\u8981\u9ebb\u70e6\u5730\u5b9a\u4e49 <code>v<\/code> \u5462\uff1f\u540e\u4e00\u79cd\u60c5\u51b5\u66f4\u7b80\u5355\uff0c\u56e0\u4e3a\u9700\u8981\u8ddf\u8e2a\u7684\u53d8\u91cf\u8f83\u5c11\uff1b\u4e5f\u8bb8\u5b83\u7684\u6027\u80fd\u66f4\u9ad8\u3002<\/p>\n<p> <\/p>\n<h2>\u89e3\u51b3\u65b9\u6848<\/h2>\n<p> <\/p>\n<p>\u5b83\u4eec\u4e0d\u53ef\u4e92\u6362\uff1b\u60a8\u53ea\u9700\u5c06 <code>i<\/code> \u4f20\u9012\u7ed9\u4e00\u4e2a\u53ef\u4ee5\u63a5\u53d7\u5b83\u7684\u51fd\u6570\uff0c\u65e0\u8bba\u5176\u7c7b\u578b\u5982\u4f55\uff08\u683c\u5f0f\u5b57\u7b26\u4e32\u540e\u9762\u7684 <code>fmt.Printf<\/code> \u53c2\u6570\u7684\u7c7b\u578b\u4e3a <code>interface{}<\/code>\uff09\u3002 <code>i<\/code> \u4ecd\u7136\u662f\u5176\u539f\u59cb\u7c7b\u578b\uff0c\u56e0\u4e3a\u53d8\u91cf\u7684\u7c7b\u578b<strong>\u65e0\u6cd5\u66f4\u6539<\/strong>\u3002<\/p>\n<p>\u5982\u679c\u60a8\u786e\u5b9e\u60f3\u6839\u636e\u5176\u7c7b\u578b\u5bf9\u5176\u6267\u884c\u67d0\u4e9b\u64cd\u4f5c\uff0c\u5219\u9700\u8981\u7b2c\u4e00\u79cd\u5f62\u5f0f\uff0c\u4ee5\u4fbf <code>v<\/code> \u5c5e\u4e8e <code>case<\/code> \u8bed\u53e5\u4e2d\u7684\u7c7b\u578b\u3002\u65e0\u8bba\u60a8\u662f\u5426\u5c06\u952e\u5165\u7684\u503c\u5206\u914d\u7ed9\u53d8\u91cf\uff0c\u539f\u59cb\u53d8\u91cf <code>i<\/code> \u90fd\u4f1a\u4fdd\u7559\u5176\u539f\u59cb\u7c7b\u578b\u3002<\/p>\n<p>\u8fd9\u5728 \u4e2d\u6709\u5f88\u597d\u7684\u4ecb\u7ecd<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u300a\u4e3a\u4ec0\u4e48\u5728 Go \u7c7b\u578b switch \u4e2d\u58f0\u660e\u4e00\u4e2a\u5355\u72ec\u7684\u53d8\u91cf\uff1f\u300b\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u5173\u4e8e\u7684\u8d44\u6599\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5f53\u524d\u4f4d\u7f6e\uff1a &gt; &gt; &#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-207416","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207416","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=207416"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207416\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207416"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207416"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207416"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}