{"id":206304,"date":"2025-06-12T11:22:39","date_gmt":"2025-06-12T03:22:39","guid":{"rendered":"https:\/\/server.hk\/cnblog\/206304\/"},"modified":"2025-06-12T11:22:39","modified_gmt":"2025-06-12T03:22:39","slug":"%e5%9c%a8-go-%e8%af%ad%e8%a8%80%e7%9a%84-flag-%e5%8c%85%e4%b8%ad%ef%bc%8c%e5%a6%82%e4%bd%95%e7%a1%ae%e5%ae%9a%e7%94%a8%e6%88%b7%e5%ae%9e%e9%99%85%e8%be%93%e5%85%a5%e4%ba%86%e5%93%aa%e4%ba%9b%e6%a0%87","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/206304\/","title":{"rendered":"\u5728 Go \u8bed\u8a00\u7684 flag \u5305\u4e2d\uff0c\u5982\u4f55\u786e\u5b9a\u7528\u6237\u5b9e\u9645\u8f93\u5165\u4e86\u54ea\u4e9b\u6807\u5fd7\uff1f"},"content":{"rendered":"<p>\u4e00\u5206\u8015\u8018\uff0c\u4e00\u5206\u6536\u83b7\uff01\u65e2\u7136\u90fd\u6253\u5f00\u8fd9\u7bc7<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300a\u5728 Go \u8bed\u8a00\u7684 flag \u5305\u4e2d\uff0c\u5982\u4f55\u786e\u5b9a\u7528\u6237\u5b9e\u9645\u8f93\u5165\u4e86\u54ea\u4e9b\u6807\u5fd7\uff1f\u300b<\/span>\uff0c\u5c31\u575a\u6301\u770b\u4e0b\u53bb\uff0c\u5b66\u4e0b\u53bb\u5427\uff01\u672c\u6587\u4e3b\u8981\u4f1a\u7ed9\u5927\u5bb6\u8bb2\u5230<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u5927\u5bb6\u5bf9\u672c\u6587\u6709\u597d\u7684\u5efa\u8bae\u6216\u8005\u770b\u5230\u6709\u4e0d\u8db3\u4e4b\u5904\uff0c\u975e\u5e38\u6b22\u8fce\u5927\u5bb6\u79ef\u6781\u63d0\u51fa\uff01\u5728\u540e\u7eed\u6587\u7ae0\u6211\u4f1a\u7ee7\u7eed\u66f4\u65b0<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">GOLANG<\/span>\u76f8\u5173\u7684\u5185\u5bb9\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u90fd\u6709\u6240\u5e2e\u52a9\uff01,<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241109\/1731116387672ebd630097f.jpg\" class=\"aligncenter\">,<br \/>\n<strong>flag \u5305\u4e2d\u6839\u636e\u5b9e\u9645\u8f93\u5165\u786e\u5b9a\u5df2\u8bbe\u7f6e\u6807\u5fd7\u7684\u65b9\u6cd5<\/strong>,\u5728 golang \u4e2d\uff0cflag \u5305\u63d0\u4f9b\u4e86\u547d\u4ee4\u884c\u89e3\u6790\u529f\u80fd\u3002\u5728\u89e3\u6790\u5b50\u547d\u4ee4\u65f6\uff0c\u5982\u4f55\u786e\u5b9a\u7528\u6237\u5b9e\u9645\u8f93\u5165\u4e86\u54ea\u4e9b\u6807\u5fd7\u5462\uff1f,\u4e00\u79cd\u65b9\u6cd5\u662f\u4f7f\u7528 visit() \u65b9\u6cd5\u904d\u5386\u6240\u6709\u5b9a\u4e49\u7684\u6807\u5fd7\uff0c\u5e76\u68c0\u67e5\u6bcf\u4e2a\u6807\u5fd7\u7684\u5b9e\u9645\u503c\u662f\u5426\u4e0e\u9ed8\u8ba4\u503c\u4e0d\u540c\u3002\u5982\u679c\u4e0d\u540c\uff0c\u5219\u8868\u793a\u8be5\u6807\u5fd7\u5df2\u88ab\u7528\u6237\u8bbe\u7f6e\u3002,\u9664\u4e86\u68c0\u67e5\u5df2\u5b9a\u4e49\u7684\u6807\u5fd7\u5916\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528 visit() \u65b9\u6cd5\u904d\u5386\u7528\u6237\u5b9e\u9645\u8f93\u5165\u7684\u6807\u5fd7\u3002\u5b83\u53ea\u4f1a\u904d\u5386\u90a3\u4e9b\u5b9e\u9645\u88ab\u8bbe\u7f6e\u8fc7\u7684\u6807\u5fd7\uff0c\u5ffd\u7565\u9ed8\u8ba4\u503c\u3002,\u8fd9\u6837\uff0c\u5c31\u53ef\u4ee5\u6839\u636e\u5b9e\u9645\u8f93\u5165\u7684\u6807\u5fd7\u6765\u51b3\u5b9a\u4e0b\u4e00\u6b65\u7684\u64cd\u4f5c\uff0c\u4f8b\u5982\u6267\u884c\u4e0d\u540c\u7684\u51fd\u6570\u6216\u63d0\u4f9b\u4e0d\u540c\u7c7b\u578b\u7684\u8f93\u51fa\u3002,\u4f8b\u5982\uff0c\u5728\u4e0b\u9762\u8fd9\u4e2a\u7a0b\u5e8f\u4e2d\uff0c\u6839\u636e\u5b9e\u9645\u8f93\u5165\u7684 -a\u3001-b \u548c -c \u6807\u5fd7\u7684\u503c\uff0c\u4e0d\u540c\u7684\u51fd\u6570\u5c06\u88ab\u8c03\u7528\u3002,\u5230\u8fd9\u91cc\uff0c\u6211\u4eec\u4e5f\u5c31\u8bb2\u5b8c\u4e86\u300a\u5728 Go \u8bed\u8a00\u7684 flag \u5305\u4e2d\uff0c\u5982\u4f55\u786e\u5b9a\u7528\u6237\u5b9e\u9645\u8f93\u5165\u4e86\u54ea\u4e9b\u6807\u5fd7\uff1f\u300b\u7684\u5185\u5bb9\u4e86\u3002\u4e2a\u4eba\u8ba4\u4e3a\uff0c\u57fa\u7840\u77e5\u8bc6\u7684\u5b66\u4e60\u548c\u5de9\u56fa\uff0c\u662f\u4e3a\u4e86\u66f4\u597d\u7684\u5c06\u5176\u8fd0\u7528\u5230\u9879\u76ee\u4e2d\uff0c\u6b22\u8fce\u5173\u6ce8GOLANG\u516c\u4f17\u53f7\uff0c\u5e26\u4f60\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u77e5\u8bc6\u70b9\uff01,flag \u5305\u4e2d\u6839\u636e\u5b9e\u9645\u8f93\u5165\u786e\u5b9a\u5df2\u8bbe\u7f6e\u6807\u5fd7\u7684\u65b9\u6cd5,\u4e00\u5206\u8015\u8018\uff0c\u4e00\u5206\u6536\u83b7\uff01\u65e2\u7136\u90fd\u6253\u5f00\u8fd9\u7bc7<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300a\u5728 Go \u8bed\u8a00\u7684 flag \u5305\u4e2d\uff0c\u5982\u4f55\u786e\u5b9a\u7528\u6237\u5b9e\u9645\u8f93\u5165\u4e86\u54ea\u4e9b\u6807\u5fd7\uff1f\u300b<\/span>\uff0c\u5c31\u575a\u6301\u770b\u4e0b\u53bb\uff0c\u5b66\u4e0b\u53bb\u5427\uff01\u672c\u6587\u4e3b\u8981\u4f1a\u7ed9\u5927\u5bb6\u8bb2\u5230<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u5927\u5bb6\u5bf9\u672c\u6587\u6709\u597d\u7684\u5efa\u8bae\u6216\u8005\u770b\u5230\u6709\u4e0d\u8db3\u4e4b\u5904\uff0c\u975e\u5e38\u6b22\u8fce\u5927\u5bb6\u79ef\u6781\u63d0\u51fa\uff01\u5728\u540e\u7eed\u6587\u7ae0\u6211\u4f1a\u7ee7\u7eed\u66f4\u65b0<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">GOLANG<\/span>\u76f8\u5173\u7684\u5185\u5bb9\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u90fd\u6709\u6240\u5e2e\u52a9\uff01,<br \/>\n<b><\/b> <\/p>\n<p>\u5f53\u524d\u4f4d\u7f6e\uff1a <span>&gt;<\/span>  <span>&gt;<\/span>  <span>&gt;<\/span>  <span>&gt;<\/span> <span>\u5728 Go \u8bed\u8a00\u7684 flag \u5305\u4e2d\uff0c\u5982\u4f55\u786e\u5b9a\u7528\u6237\u5b9e\u9645\u8f93\u5165\u4e86\u54ea\u4e9b\u6807\u5fd7\uff1f<\/span><\/p>\n<h1>\u5728 Go \u8bed\u8a00\u7684 flag \u5305\u4e2d\uff0c\u5982\u4f55\u786e\u5b9a\u7528\u6237\u5b9e\u9645\u8f93\u5165\u4e86\u54ea\u4e9b\u6807\u5fd7\uff1f<\/h1>\n<p><span>2024-11-09 09:40:02<\/span><br \/>\n<span><i><\/i>0\u6d4f\u89c8<\/span><br \/>\n<span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> <\/p>\n<p>\u4e00\u5206\u8015\u8018\uff0c\u4e00\u5206\u6536\u83b7\uff01\u65e2\u7136\u90fd\u6253\u5f00\u8fd9\u7bc7<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300a\u5728 Go \u8bed\u8a00\u7684 flag \u5305\u4e2d\uff0c\u5982\u4f55\u786e\u5b9a\u7528\u6237\u5b9e\u9645\u8f93\u5165\u4e86\u54ea\u4e9b\u6807\u5fd7\uff1f\u300b<\/span>\uff0c\u5c31\u575a\u6301\u770b\u4e0b\u53bb\uff0c\u5b66\u4e0b\u53bb\u5427\uff01\u672c\u6587\u4e3b\u8981\u4f1a\u7ed9\u5927\u5bb6\u8bb2\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u5927\u5bb6\u5bf9\u672c\u6587\u6709\u597d\u7684\u5efa\u8bae\u6216\u8005\u770b\u5230\u6709\u4e0d\u8db3\u4e4b\u5904\uff0c\u975e\u5e38\u6b22\u8fce\u5927\u5bb6\u79ef\u6781\u63d0\u51fa\uff01\u5728\u540e\u7eed\u6587\u7ae0\u6211\u4f1a\u7ee7\u7eed\u66f4\u65b0<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">GOLANG<\/span>\u76f8\u5173\u7684\u5185\u5bb9\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u90fd\u6709\u6240\u5e2e\u52a9\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241109\/1731116387672ebd630097f.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>flag \u5305\u4e2d\u6839\u636e\u5b9e\u9645\u8f93\u5165\u786e\u5b9a\u5df2\u8bbe\u7f6e\u6807\u5fd7\u7684\u65b9\u6cd5<\/strong><\/p>\n<p>\u5728 golang \u4e2d\uff0cflag \u5305\u63d0\u4f9b\u4e86\u547d\u4ee4\u884c\u89e3\u6790\u529f\u80fd\u3002\u5728\u89e3\u6790\u5b50\u547d\u4ee4\u65f6\uff0c\u5982\u4f55\u786e\u5b9a\u7528\u6237\u5b9e\u9645\u8f93\u5165\u4e86\u54ea\u4e9b\u6807\u5fd7\u5462\uff1f<\/p>\n<p>\u4e00\u79cd\u65b9\u6cd5\u662f\u4f7f\u7528 visit() \u65b9\u6cd5\u904d\u5386\u6240\u6709\u5b9a\u4e49\u7684\u6807\u5fd7\uff0c\u5e76\u68c0\u67e5\u6bcf\u4e2a\u6807\u5fd7\u7684\u5b9e\u9645\u503c\u662f\u5426\u4e0e\u9ed8\u8ba4\u503c\u4e0d\u540c\u3002\u5982\u679c\u4e0d\u540c\uff0c\u5219\u8868\u793a\u8be5\u6807\u5fd7\u5df2\u88ab\u7528\u6237\u8bbe\u7f6e\u3002<\/p>\n<pre>\/\/ \u904d\u5386\u6240\u6709\u5b9a\u4e49\u7684 flag\ncmd.visitall(func(f *flag.flag) {\n    if f.value.string() != f.defvalue {\n        fmt.printf(\"%s = %s [default = %s]\\n\", f.name, f.value.string(), f.defvalue)\n    } else {\n        fmt.printf(\"%s = %s\\n\", f.name, f.value.string())\n    }\n})<\/pre>\n<p>\u9664\u4e86\u68c0\u67e5\u5df2\u5b9a\u4e49\u7684\u6807\u5fd7\u5916\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528 visit() \u65b9\u6cd5\u904d\u5386\u7528\u6237\u5b9e\u9645\u8f93\u5165\u7684\u6807\u5fd7\u3002\u5b83\u53ea\u4f1a\u904d\u5386\u90a3\u4e9b\u5b9e\u9645\u88ab\u8bbe\u7f6e\u8fc7\u7684\u6807\u5fd7\uff0c\u5ffd\u7565\u9ed8\u8ba4\u503c\u3002<\/p>\n<pre>\/\/ \u904d\u5386\u5b9e\u9645\u8f93\u5165\u7684 flag\ncmd.visit(func(f *flag.flag) {\n    if f.value.string() != f.defvalue {\n        fmt.printf(\"%s = %s [default = %s]\\n\", f.name, f.value.string(), f.defvalue)\n    } else {\n        fmt.printf(\"%s = %s\\n\", f.name, f.value.string())\n    }\n})<\/pre>\n<p>\u8fd9\u6837\uff0c\u5c31\u53ef\u4ee5\u6839\u636e\u5b9e\u9645\u8f93\u5165\u7684\u6807\u5fd7\u6765\u51b3\u5b9a\u4e0b\u4e00\u6b65\u7684\u64cd\u4f5c\uff0c\u4f8b\u5982\u6267\u884c\u4e0d\u540c\u7684\u51fd\u6570\u6216\u63d0\u4f9b\u4e0d\u540c\u7c7b\u578b\u7684\u8f93\u51fa\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5728\u4e0b\u9762\u8fd9\u4e2a\u7a0b\u5e8f\u4e2d\uff0c\u6839\u636e\u5b9e\u9645\u8f93\u5165\u7684 -a\u3001-b \u548c -c \u6807\u5fd7\u7684\u503c\uff0c\u4e0d\u540c\u7684\u51fd\u6570\u5c06\u88ab\u8c03\u7528\u3002<\/p>\n<pre>import (\n    \"fmt\"\n    \"os\"\n\n    \"github.com\/spf13\/cobra\"\n)\n\nvar fooCmd = &amp;cobra.Command{\n    Use:   \"foo\",\n    Short: \"Foo command\",\n    Args:  cobra.MinimumNArgs(0),\n    Run: func(cmd *cobra.Command, args []string) {\n        a := cmd.Flag(\"a\").Value.String()\n        b := cmd.Flag(\"b\").Value.String()\n\n        if a != \"\" &amp;&amp; b != \"\" {\n            AB()\n        } else if a != \"\" {\n            A()\n        } else if b != \"\" {\n            B()\n        } else {\n            X()\n        }\n    },\n}\n\nfunc init() {\n    fooCmd.Flags().StringP(\"a\", \"a\", \"\", \"A flag\")\n    fooCmd.Flags().StringP(\"b\", \"b\", \"\", \"B flag\")\n}\n\nfunc A() {\n    fmt.Println(\"Function A\")\n}\n\nfunc B() {\n    fmt.Println(\"Function B\")\n}\n\nfunc AB() {\n    fmt.Println(\"Function AB\")\n}\n\nfunc X() {\n    fmt.Println(\"Function X\")\n}\n\nfunc main() {\n    rootCmd := &amp;cobra.Command{\n        Use:   \"test\",\n        Short: \"Test command\",\n    }\n\n    rootCmd.AddCommand(fooCmd)\n\n    rootCmd.Execute()\n}<\/pre>\n<p>\u5230\u8fd9\u91cc\uff0c\u6211\u4eec\u4e5f\u5c31\u8bb2\u5b8c\u4e86\u300a\u5728 Go \u8bed\u8a00\u7684 flag \u5305\u4e2d\uff0c\u5982\u4f55\u786e\u5b9a\u7528\u6237\u5b9e\u9645\u8f93\u5165\u4e86\u54ea\u4e9b\u6807\u5fd7\uff1f\u300b\u7684\u5185\u5bb9\u4e86\u3002\u4e2a\u4eba\u8ba4\u4e3a\uff0c\u57fa\u7840\u77e5\u8bc6\u7684\u5b66\u4e60\u548c\u5de9\u56fa\uff0c\u662f\u4e3a\u4e86\u66f4\u597d\u7684\u5c06\u5176\u8fd0\u7528\u5230\u9879\u76ee\u4e2d\uff0c\u6b22\u8fce\u5173\u6ce8GOLANG\u516c\u4f17\u53f7\uff0c\u5e26\u4f60\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u77e5\u8bc6\u70b9\uff01<\/p>\n<dl>\n<dt>\n <\/dt>\n<dd>\n   \u5982\u4f55\u9ad8\u6548\u5730\u5728MySQL\u6570\u636e\u5e93\u4e2d\u5b58\u50a8\u5feb\u9012\u8fd0\u8f93\u8f68\u8ff9\u4fe1\u606f\uff1f\n <\/dd>\n<\/dl>\n<dl>\n<dt>\n <\/dt>\n<dd>\n   \u5b89\u5353\u6253\u5f00 Word \u6587\u6863\u51fa\u9519\uff0c\u7a0b\u5e8f\u81ea\u52a8\u5173\u95ed\uff0c\u5982\u4f55\u6392\u67e5\u548c\u89e3\u51b3\uff1f\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u5206\u8015\u8018\uff0c\u4e00\u5206\u6536\u83b7\uff01\u65e2\u7136\u90fd\u6253\u5f00\u8fd9&#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-206304","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206304","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=206304"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206304\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=206304"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=206304"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=206304"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}