{"id":206082,"date":"2025-06-12T10:32:37","date_gmt":"2025-06-12T02:32:37","guid":{"rendered":"https:\/\/server.hk\/cnblog\/206082\/"},"modified":"2025-06-12T10:32:37","modified_gmt":"2025-06-12T02:32:37","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-go-%e8%af%ad%e8%a8%80%e7%9a%84-visit-%e6%96%b9%e6%b3%95%e8%af%86%e5%88%ab%e7%94%a8%e6%88%b7%e8%be%93%e5%85%a5%e7%9a%84%e6%a0%87%e8%ae%b0%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/206082\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528 Go \u8bed\u8a00\u7684 Visit() \u65b9\u6cd5\u8bc6\u522b\u7528\u6237\u8f93\u5165\u7684\u6807\u8bb0\uff1f"},"content":{"rendered":"<p>\u672c\u7bc7\u6587\u7ae0\u5411\u5927\u5bb6\u4ecb\u7ecd\u300a\u5982\u4f55\u4f7f\u7528 Go \u8bed\u8a00\u7684 Visit() \u65b9\u6cd5\u8bc6\u522b\u7528\u6237\u8f93\u5165\u7684\u6807\u8bb0\uff1f \u300b\uff0c\u4e3b\u8981\u5305\u62ec\uff0c\u5177\u6709\u4e00\u5b9a\u7684\u53c2\u8003\u4ef7\u503c\uff0c\u9700\u8981\u7684\u670b\u53cb\u53ef\u4ee5\u53c2\u8003\u4e00\u4e0b\u3002,<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241102\/17305520856726211597075.jpg\" class=\"aligncenter\">,<br \/>\n<strong>\u4f7f\u7528 visit() \u65b9\u6cd5\u8bc6\u522b\u8f93\u5165\u7684 go \u6807\u8bb0<\/strong>,\u5728\u4f7f\u7528 go \u8bed\u8a00\u5904\u7406\u6807\u8bb0\u547d\u4ee4\u65f6\uff0c\u4e86\u89e3\u7528\u6237\u5b9e\u9645\u8f93\u5165\u7684\u6807\u8bb0\u81f3\u5173\u91cd\u8981\u3002\u8fd9\u5bf9\u4e8e\u6839\u636e\u6807\u8bb0\u6765\u786e\u5b9a\u8981\u6267\u884c\u7684\u51fd\u6570\u6216\u64cd\u4f5c\u5f88\u6709\u7528\u3002,\u8ba9\u6211\u4eec\u4ee5 foocmd \u5b50\u547d\u4ee4\u4e3a\u4f8b\uff0c\u5176\u4e2d\u5305\u542b\u591a\u4e2a\u6807\u8bb0\uff1a,\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 flag \u5305\u4e2d\u63d0\u4f9b\u7684 visit() \u65b9\u6cd5\u6765\u904d\u5386\u5b9e\u9645\u8f93\u5165\u7684\u6807\u8bb0\u3002\u6b64\u65b9\u6cd5\u63a5\u53d7\u4e00\u4e2a\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\uff0c\u8be5\u51fd\u6570\u5bf9\u6807\u8bb0\u5217\u8868\u4e2d\u7684\u6bcf\u4e2a\u6807\u8bb0\u8fdb\u884c\u64cd\u4f5c\u3002,\u4ee5\u4e0b\u662f\u5982\u4f55\u627e\u51fa\u7528\u6237\u5b9e\u9645\u8f93\u5165\u7684\u6807\u8bb0\u7684\u793a\u4f8b\u4ee3\u7801\uff1a,\u8fd9\u5c06\u6253\u5370\u6bcf\u4e2a\u6807\u8bb0\u7684\u540d\u79f0\u3001\u503c\u548c\u9ed8\u8ba4\u503c\u3002\u901a\u8fc7\u6bd4\u8f83\u503c\u548c\u9ed8\u8ba4\u503c\uff0c\u60a8\u53ef\u4ee5\u8bc6\u522b\u7528\u6237\u8f93\u5165\u7684\u6807\u8bb0\u3002,\u4ee5\u4e0b\u662f\u4e00\u4e9b\u793a\u4f8b\u8f93\u51fa\uff1a,\u5728\u4e0a\u8ff0\u8f93\u51fa\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u7528\u6237\u8f93\u5165\u4e86\u6807\u8bb0 &#8220;a&#8221; \u548c &#8220;c&#8221;\u3002,\u73b0\u5728\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u6b64\u4fe1\u606f\u6765\u786e\u5b9a\u8981\u6267\u884c\u7684\u51fd\u6570\u6216\u64cd\u4f5c\u3002\u4f8b\u5982\uff1a,\u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u70b9\u5728\u4e8e\u5b83\u53ef\u4ee5\u7075\u6d3b\u5730\u5904\u7406\u4e0d\u540c\u7684\u6807\u8bb0\u7ec4\u5408\u3002\u5b83\u8fd8\u5141\u8bb8\u60a8\u8bbf\u95ee\u6807\u8bb0\u7684\u503c\uff0c\u4ee5\u4fbf\u5728\u9700\u8981\u65f6\u8fdb\u884c\u66f4\u7cbe\u7ec6\u7684\u63a7\u5236\u3002,\u5230\u8fd9\u91cc\uff0c\u6211\u4eec\u4e5f\u5c31\u8bb2\u5b8c\u4e86\u300a\u5982\u4f55\u4f7f\u7528 Go \u8bed\u8a00\u7684 Visit() \u65b9\u6cd5\u8bc6\u522b\u7528\u6237\u8f93\u5165\u7684\u6807\u8bb0\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,\u4f7f\u7528 visit() \u65b9\u6cd5\u8bc6\u522b\u8f93\u5165\u7684 go \u6807\u8bb0,\u672c\u7bc7\u6587\u7ae0\u5411\u5927\u5bb6\u4ecb\u7ecd\u300a\u5982\u4f55\u4f7f\u7528 Go \u8bed\u8a00\u7684 Visit() \u65b9\u6cd5\u8bc6\u522b\u7528\u6237\u8f93\u5165\u7684\u6807\u8bb0\uff1f \u300b\uff0c\u4e3b\u8981\u5305\u62ec\uff0c\u5177\u6709\u4e00\u5b9a\u7684\u53c2\u8003\u4ef7\u503c\uff0c\u9700\u8981\u7684\u670b\u53cb\u53ef\u4ee5\u53c2\u8003\u4e00\u4e0b\u3002,<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>\u5982\u4f55\u4f7f\u7528 Go \u8bed\u8a00\u7684 Visit() \u65b9\u6cd5\u8bc6\u522b\u7528\u6237\u8f93\u5165\u7684\u6807\u8bb0\uff1f <\/span><\/p>\n<h1>\u5982\u4f55\u4f7f\u7528 Go \u8bed\u8a00\u7684 Visit() \u65b9\u6cd5\u8bc6\u522b\u7528\u6237\u8f93\u5165\u7684\u6807\u8bb0\uff1f <\/h1>\n<p><span>2024-11-02 20:55:01<\/span><br \/>\n<span><i><\/i>0\u6d4f\u89c8<\/span><br \/>\n<span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> <\/p>\n<p>\u672c\u7bc7\u6587\u7ae0\u5411\u5927\u5bb6\u4ecb\u7ecd\u300a\u5982\u4f55\u4f7f\u7528 Go \u8bed\u8a00\u7684 Visit() \u65b9\u6cd5\u8bc6\u522b\u7528\u6237\u8f93\u5165\u7684\u6807\u8bb0\uff1f \u300b\uff0c\u4e3b\u8981\u5305\u62ec\uff0c\u5177\u6709\u4e00\u5b9a\u7684\u53c2\u8003\u4ef7\u503c\uff0c\u9700\u8981\u7684\u670b\u53cb\u53ef\u4ee5\u53c2\u8003\u4e00\u4e0b\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241102\/17305520856726211597075.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>\u4f7f\u7528 visit() \u65b9\u6cd5\u8bc6\u522b\u8f93\u5165\u7684 go \u6807\u8bb0<\/strong><\/p>\n<p>\u5728\u4f7f\u7528 go \u8bed\u8a00\u5904\u7406\u6807\u8bb0\u547d\u4ee4\u65f6\uff0c\u4e86\u89e3\u7528\u6237\u5b9e\u9645\u8f93\u5165\u7684\u6807\u8bb0\u81f3\u5173\u91cd\u8981\u3002\u8fd9\u5bf9\u4e8e\u6839\u636e\u6807\u8bb0\u6765\u786e\u5b9a\u8981\u6267\u884c\u7684\u51fd\u6570\u6216\u64cd\u4f5c\u5f88\u6709\u7528\u3002<\/p>\n<p>\u8ba9\u6211\u4eec\u4ee5 foocmd \u5b50\u547d\u4ee4\u4e3a\u4f8b\uff0c\u5176\u4e2d\u5305\u542b\u591a\u4e2a\u6807\u8bb0\uff1a<\/p>\n<pre>foocmd := flag.newflagset(\"foo\", flag.exitonerror)\nfooa := foocmd.string(\"a\", \"0\", \"a\")\nfoob := foocmd.string(\"b\", \"0\", \"b\")\n\/\/ \u6dfb\u52a0\u66f4\u591a\u6807\u8bb0...<\/pre>\n<p>\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 flag \u5305\u4e2d\u63d0\u4f9b\u7684 visit() \u65b9\u6cd5\u6765\u904d\u5386\u5b9e\u9645\u8f93\u5165\u7684\u6807\u8bb0\u3002\u6b64\u65b9\u6cd5\u63a5\u53d7\u4e00\u4e2a\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\uff0c\u8be5\u51fd\u6570\u5bf9\u6807\u8bb0\u5217\u8868\u4e2d\u7684\u6bcf\u4e2a\u6807\u8bb0\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u5982\u4f55\u627e\u51fa\u7528\u6237\u5b9e\u9645\u8f93\u5165\u7684\u6807\u8bb0\u7684\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n<pre>foocmd.parse(os.args[2:])\n\n\/\/ \u904d\u5386\u5b9e\u9645\u4f20\u5165\u7684\u6807\u8bb0\nfoocmd.visit(func(f *flag.flag) {\n    fmt.printf(\"%s = %s [default = %s]\\n\", f.name, f.value.string(), f.defvalue)\n})<\/pre>\n<p>\u8fd9\u5c06\u6253\u5370\u6bcf\u4e2a\u6807\u8bb0\u7684\u540d\u79f0\u3001\u503c\u548c\u9ed8\u8ba4\u503c\u3002\u901a\u8fc7\u6bd4\u8f83\u503c\u548c\u9ed8\u8ba4\u503c\uff0c\u60a8\u53ef\u4ee5\u8bc6\u522b\u7528\u6237\u8f93\u5165\u7684\u6807\u8bb0\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u793a\u4f8b\u8f93\u51fa\uff1a<\/p>\n<pre>a = 10 [default = -1]\nc = true [default = false]<\/pre>\n<p>\u5728\u4e0a\u8ff0\u8f93\u51fa\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u7528\u6237\u8f93\u5165\u4e86\u6807\u8bb0 &#8220;a&#8221; \u548c &#8220;c&#8221;\u3002<\/p>\n<p>\u73b0\u5728\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u6b64\u4fe1\u606f\u6765\u786e\u5b9a\u8981\u6267\u884c\u7684\u51fd\u6570\u6216\u64cd\u4f5c\u3002\u4f8b\u5982\uff1a<\/p>\n<pre>if f.Name == \"a\" {\n    \/\/ \u6267\u884c A() \u51fd\u6570\n} else if f.Name == \"b\" {\n    \/\/ \u6267\u884c B() \u51fd\u6570\n}<\/pre>\n<p>\u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u70b9\u5728\u4e8e\u5b83\u53ef\u4ee5\u7075\u6d3b\u5730\u5904\u7406\u4e0d\u540c\u7684\u6807\u8bb0\u7ec4\u5408\u3002\u5b83\u8fd8\u5141\u8bb8\u60a8\u8bbf\u95ee\u6807\u8bb0\u7684\u503c\uff0c\u4ee5\u4fbf\u5728\u9700\u8981\u65f6\u8fdb\u884c\u66f4\u7cbe\u7ec6\u7684\u63a7\u5236\u3002<\/p>\n<p>\u5230\u8fd9\u91cc\uff0c\u6211\u4eec\u4e5f\u5c31\u8bb2\u5b8c\u4e86\u300a\u5982\u4f55\u4f7f\u7528 Go \u8bed\u8a00\u7684 Visit() \u65b9\u6cd5\u8bc6\u522b\u7528\u6237\u8f93\u5165\u7684\u6807\u8bb0\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   Pylot\u6a2a\u5750\u6807\uff1a\u5982\u4f55\u53ea\u663e\u793a\u5c0f\u65f6\u548c\u5206\u949f\uff0c\u9690\u85cf\u5e74\u6708\u65e5\uff1f\n <\/dd>\n<\/dl>\n<dl>\n<dt>\n <\/dt>\n<dd>\n   PHP \u4e2d\u7684 session_start() \u5230\u5e95\u8981\u4e0d\u8981\u7528\uff1f\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u7bc7\u6587\u7ae0\u5411\u5927\u5bb6\u4ecb\u7ecd\u300a\u5982\u4f55\u4f7f\u7528 G&#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-206082","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206082","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=206082"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206082\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=206082"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=206082"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=206082"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}