{"id":57706,"date":"2024-10-10T20:31:37","date_gmt":"2024-10-10T12:31:37","guid":{"rendered":"https:\/\/server.hk\/cnblog\/57706\/"},"modified":"2024-10-10T20:31:37","modified_gmt":"2024-10-10T12:31:37","slug":"go%e6%95%99%e7%a8%8b-go-%e8%aa%9e%e8%a8%80-flag-%e5%8c%85%ef%bc%9a%e5%91%bd%e4%bb%a4%e8%a1%8c%e5%8f%83%e6%95%b8%e8%a7%a3%e6%9e%90","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/57706\/","title":{"rendered":"GO\u6559\u7a0b: Go \u8a9e\u8a00 flag \u5305\uff1a\u547d\u4ee4\u884c\u53c3\u6578\u89e3\u6790"},"content":{"rendered":"<h1 id=\"go%e6%95%99%e7%a8%8b-go-%e8%aa%9e%e8%a8%80-flag-%e5%8c%85%ef%bc%9a%e5%91%bd%e4%bb%a4%e8%a1%8c%e5%8f%83%e6%95%b8%e8%a7%a3%e6%9e%90-qMHEywyDUb\">GO\u6559\u7a0b: Go \u8a9e\u8a00 flag \u5305\uff1a\u547d\u4ee4\u884c\u53c3\u6578\u89e3\u6790<\/h1>\n<p>\u5728\u73fe\u4ee3\u61c9\u7528\u7a0b\u5f0f\u958b\u767c\u4e2d\uff0c\u547d\u4ee4\u884c\u53c3\u6578\u7684\u89e3\u6790\u662f\u4e00\u500b\u4e0d\u53ef\u6216\u7f3a\u7684\u529f\u80fd\u3002Go \u8a9e\u8a00\u63d0\u4f9b\u4e86\u4e00\u500b\u5167\u5efa\u7684 <code>flag<\/code> \u5305\uff0c\u8b93\u958b\u767c\u8005\u80fd\u5920\u8f15\u9b06\u5730\u8655\u7406\u547d\u4ee4\u884c\u53c3\u6578\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e <code>flag<\/code> \u5305\u7684\u4f7f\u7528\u65b9\u6cd5\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u7bc4\u4f8b\u4f86\u5e6b\u52a9\u8b80\u8005\u7406\u89e3\u5176\u529f\u80fd\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-flag-%e5%8c%85%ef%bc%9f-qMHEywyDUb\">\u4ec0\u9ebc\u662f flag \u5305\uff1f<\/h2>\n<p><code>flag<\/code> \u5305\u662f Go \u8a9e\u8a00\u6a19\u6e96\u5eab\u4e2d\u7684\u4e00\u90e8\u5206\uff0c\u5c08\u9580\u7528\u65bc\u89e3\u6790\u547d\u4ee4\u884c\u53c3\u6578\u3002\u5b83\u5141\u8a31\u958b\u767c\u8005\u5b9a\u7fa9\u547d\u4ee4\u884c\u9078\u9805\uff0c\u4e26\u81ea\u52d5\u8655\u7406\u7528\u6236\u8f38\u5165\u7684\u53c3\u6578\u3002\u9019\u5c0d\u65bc\u9700\u8981\u5f9e\u547d\u4ee4\u884c\u63a5\u6536\u914d\u7f6e\u6216\u9078\u9805\u7684\u61c9\u7528\u7a0b\u5f0f\u4f86\u8aaa\uff0c\u6975\u70ba\u91cd\u8981\u3002<\/p>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-flag-%e5%8c%85-qMHEywyDUb\">\u5982\u4f55\u4f7f\u7528 flag \u5305<\/h2>\n<p>\u4f7f\u7528 <code>flag<\/code> \u5305\u7684\u7b2c\u4e00\u6b65\u662f\u5c0e\u5165\u8a72\u5305\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u7bc4\u4f8b\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528 <code>flag<\/code> \u5305\u4f86\u89e3\u6790\u547d\u4ee4\u884c\u53c3\u6578\uff1a<\/p>\n<pre><code>package main\n\nimport (\n    \"flag\"\n    \"fmt\"\n)\n\nfunc main() {\n    \/\/ \u5b9a\u7fa9\u547d\u4ee4\u884c\u53c3\u6578\n    name := flag.String(\"name\", \"World\", \"\u8f38\u5165\u4f60\u7684\u540d\u5b57\")\n    age := flag.Int(\"age\", 0, \"\u8f38\u5165\u4f60\u7684\u5e74\u9f61\")\n    \n    \/\/ \u89e3\u6790\u547d\u4ee4\u884c\u53c3\u6578\n    flag.Parse()\n    \n    \/\/ \u8f38\u51fa\u7d50\u679c\n    fmt.Printf(\"\u4f60\u597d\uff0c%s\uff01\u4f60\u7684\u5e74\u9f61\u662f %d\u3002n\", *name, *age)\n}\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u5b9a\u7fa9\u4e86\u5169\u500b\u547d\u4ee4\u884c\u53c3\u6578\uff1a<code>name<\/code> \u548c <code>age<\/code>\u3002\u4f7f\u7528 <code>flag.String<\/code> \u548c <code>flag.Int<\/code> \u51fd\u6578\u4f86\u5b9a\u7fa9\u9019\u4e9b\u53c3\u6578\uff0c\u4e26\u63d0\u4f9b\u9810\u8a2d\u503c\u548c\u8aaa\u660e\u3002\u63a5\u8457\uff0c\u6211\u5011\u4f7f\u7528 <code>flag.Parse()<\/code> \u4f86\u89e3\u6790\u547d\u4ee4\u884c\u8f38\u5165\uff0c\u6700\u5f8c\u8f38\u51fa\u7d50\u679c\u3002<\/p>\n<h2 id=\"%e5%91%bd%e4%bb%a4%e8%a1%8c%e5%8f%83%e6%95%b8%e7%9a%84%e4%bd%bf%e7%94%a8-qMHEywyDUb\">\u547d\u4ee4\u884c\u53c3\u6578\u7684\u4f7f\u7528<\/h2>\n<p>\u7576\u6211\u5011\u7de8\u8b6f\u4e26\u904b\u884c\u9019\u500b\u7a0b\u5f0f\u6642\uff0c\u53ef\u4ee5\u901a\u904e\u547d\u4ee4\u884c\u50b3\u905e\u53c3\u6578\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>go run main.go -name=Alice -age=30\n<\/code><\/pre>\n<p>\u9019\u5c07\u8f38\u51fa\uff1a<\/p>\n<pre><code>\u4f60\u597d\uff0cAlice\uff01\u4f60\u7684\u5e74\u9f61\u662f 30\u3002\n<\/code><\/pre>\n<h2 id=\"%e8%99%95%e7%90%86%e5%b8%83%e6%9e%97%e5%80%bc%e5%8f%83%e6%95%b8-qMHEywyDUb\">\u8655\u7406\u5e03\u6797\u503c\u53c3\u6578<\/h2>\n<p>\u9664\u4e86\u5b57\u4e32\u548c\u6574\u6578\uff0c<code>flag<\/code> \u5305\u9084\u652f\u6301\u5e03\u6797\u503c\u53c3\u6578\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u7bc4\uff1a<\/p>\n<pre><code>package main\n\nimport (\n    \"flag\"\n    \"fmt\"\n)\n\nfunc main() {\n    verbose := flag.Bool(\"verbose\", false, \"\u555f\u7528\u8a73\u7d30\u6a21\u5f0f\")\n    \n    \/\/ \u89e3\u6790\u547d\u4ee4\u884c\u53c3\u6578\n    flag.Parse()\n    \n    if *verbose {\n        fmt.Println(\"\u8a73\u7d30\u6a21\u5f0f\u5df2\u555f\u7528\")\n    } else {\n        fmt.Println(\"\u8a73\u7d30\u6a21\u5f0f\u672a\u555f\u7528\")\n    }\n}\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u5b9a\u7fa9\u4e86\u4e00\u500b\u5e03\u6797\u503c\u53c3\u6578 <code>verbose<\/code>\u3002\u7576\u7528\u6236\u5728\u547d\u4ee4\u884c\u4e2d\u4f7f\u7528 <code>-verbose<\/code> \u6642\uff0c\u8a72\u53c3\u6578\u5c07\u88ab\u8a2d\u7f6e\u70ba <code>true<\/code>\u3002<\/p>\n<h2 id=\"%e8%87%aa%e5%ae%9a%e7%be%a9%e5%8f%83%e6%95%b8%e9%a1%9e%e5%9e%8b-qMHEywyDUb\">\u81ea\u5b9a\u7fa9\u53c3\u6578\u985e\u578b<\/h2>\n<p>\u5982\u679c\u5167\u5efa\u7684\u53c3\u6578\u985e\u578b\u4e0d\u7b26\u5408\u9700\u6c42\uff0c\u958b\u767c\u8005\u9084\u53ef\u4ee5\u81ea\u5b9a\u7fa9\u53c3\u6578\u985e\u578b\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>package main\n\nimport (\n    \"flag\"\n    \"fmt\"\n)\n\ntype IPAddress string\n\nfunc (ip *IPAddress) String() string {\n    return string(*ip)\n}\n\nfunc (ip *IPAddress) Set(value string) error {\n    *ip = IPAddress(value)\n    return nil\n}\n\nfunc main() {\n    var ip IPAddress\n    flag.Var(&amp;ip, \"ip\", \"\u8f38\u5165IP\u5730\u5740\")\n    \n    \/\/ \u89e3\u6790\u547d\u4ee4\u884c\u53c3\u6578\n    flag.Parse()\n    \n    fmt.Printf(\"\u8f38\u5165\u7684IP\u5730\u5740\u662f\uff1a%sn\", ip)\n}\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u5b9a\u7fa9\u4e86\u4e00\u500b\u81ea\u5b9a\u7fa9\u7684 <code>IPAddress<\/code> \u985e\u578b\uff0c\u4e26\u5be6\u73fe\u4e86 <code>String<\/code> \u548c <code>Set<\/code> \u65b9\u6cd5\uff0c\u4ee5\u4fbf\u80fd\u5920\u5728\u547d\u4ee4\u884c\u4e2d\u4f7f\u7528\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-qMHEywyDUb\">\u7e3d\u7d50<\/h2>\n<p>Go \u8a9e\u8a00\u7684 <code>flag<\/code> \u5305\u63d0\u4f9b\u4e86\u4e00\u500b\u7c21\u55ae\u800c\u5f37\u5927\u7684\u65b9\u5f0f\u4f86\u89e3\u6790\u547d\u4ee4\u884c\u53c3\u6578\u3002\u7121\u8ad6\u662f\u57fa\u672c\u7684\u5b57\u4e32\u3001\u6574\u6578\u548c\u5e03\u6797\u503c\uff0c\u9084\u662f\u81ea\u5b9a\u7fa9\u7684\u53c3\u6578\u985e\u578b\uff0c\u958b\u767c\u8005\u90fd\u80fd\u5920\u9748\u6d3b\u5730\u8655\u7406\u5404\u7a2e\u9700\u6c42\u3002\u900f\u904e\u9019\u4e9b\u529f\u80fd\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u66f4\u65b9\u4fbf\u5730\u69cb\u5efa\u547d\u4ee4\u884c\u5de5\u5177\u548c\u61c9\u7528\u7a0b\u5f0f\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u9069\u5408\u5404\u7a2e\u9700\u6c42\u3002\u7121\u8ad6\u662f\u958b\u767c\u74b0\u5883\u9084\u662f\u751f\u7522\u74b0\u5883\uff0c\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3 Go \u8a9e\u8a00\u4e2d\u7684 flag \u5305\uff0c\u5b78\u7fd2\u5982\u4f55\u8f15\u9b06\u89e3\u6790\u547d\u4ee4\u884c\u53c3\u6578\uff0c\u63d0\u5347\u4f60\u7684\u61c9\u7528\u7a0b\u5f0f\u529f\u80fd\u8207\u4f7f\u7528\u8005\u9ad4\u9a57\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4924],"tags":[],"class_list":["post-57706","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/57706","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=57706"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/57706\/revisions"}],"predecessor-version":[{"id":57707,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/57706\/revisions\/57707"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=57706"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=57706"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=57706"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}