{"id":57640,"date":"2024-10-10T19:56:15","date_gmt":"2024-10-10T11:56:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/57640\/"},"modified":"2024-10-10T19:56:15","modified_gmt":"2024-10-10T11:56:15","slug":"go%e6%95%99%e7%a8%8b-go-%e8%aa%9e%e8%a8%80%e9%96%89%e5%8c%85%ef%bc%88closure%ef%bc%89-%e5%bc%95%e7%94%a8%e4%ba%86%e5%a4%96%e9%83%a8%e8%ae%8a%e9%87%8f%e7%9a%84%e5%8c%bf%e5%90%8d","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/57640\/","title":{"rendered":"GO\u6559\u7a0b: Go \u8a9e\u8a00\u9589\u5305\uff08Closure\uff09\u2014\u2014\u5f15\u7528\u4e86\u5916\u90e8\u8b8a\u91cf\u7684\u533f\u540d\u51fd\u6578"},"content":{"rendered":"<h1 id=\"go%e6%95%99%e7%a8%8b-go-%e8%aa%9e%e8%a8%80%e9%96%89%e5%8c%85%ef%bc%88closure%ef%bc%89-%e5%bc%95%e7%94%a8%e4%ba%86%e5%a4%96%e9%83%a8%e8%ae%8a%e9%87%8f%e7%9a%84%e5%8c%bf%e5%90%8d-AQWtrhuIfx\">GO\u6559\u7a0b: Go \u8a9e\u8a00\u9589\u5305\uff08Closure\uff09\u2014\u2014\u5f15\u7528\u4e86\u5916\u90e8\u8b8a\u91cf\u7684\u533f\u540d\u51fd\u6578<\/h1>\n<p>\u5728 Go \u8a9e\u8a00\u4e2d\uff0c\u9589\u5305\uff08Closure\uff09\u662f\u4e00\u500b\u975e\u5e38\u91cd\u8981\u7684\u6982\u5ff5\u3002\u5b83\u5141\u8a31\u51fd\u6578\u5f15\u7528\u5176\u5916\u90e8\u8b8a\u91cf\uff0c\u9019\u4f7f\u5f97\u51fd\u6578\u7684\u884c\u70ba\u66f4\u52a0\u9748\u6d3b\u548c\u5f37\u5927\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e Go \u8a9e\u8a00\u4e2d\u7684\u9589\u5305\uff0c\u4e26\u901a\u904e\u793a\u4f8b\u4f86\u5e6b\u52a9\u8b80\u8005\u7406\u89e3\u5176\u7528\u6cd5\u548c\u7279\u6027\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e9%96%89%e5%8c%85%ef%bc%9f-AQWtrhuIfx\">\u4ec0\u9ebc\u662f\u9589\u5305\uff1f<\/h2>\n<p>\u9589\u5305\u662f\u6307\u4e00\u500b\u51fd\u6578\u8207\u5176\u5f15\u7528\u7684\u8b8a\u91cf\u7684\u74b0\u5883\u7d44\u5408\u3002\u9019\u610f\u5473\u8457\uff0c\u7576\u4e00\u500b\u51fd\u6578\u88ab\u5b9a\u7fa9\u5728\u53e6\u4e00\u500b\u51fd\u6578\u5167\u90e8\u6642\uff0c\u5b83\u53ef\u4ee5\u8a2a\u554f\u5916\u90e8\u51fd\u6578\u7684\u8b8a\u91cf\uff0c\u5373\u4f7f\u5916\u90e8\u51fd\u6578\u5df2\u7d93\u8fd4\u56de\u3002\u9019\u7a2e\u7279\u6027\u4f7f\u5f97\u9589\u5305\u5728\u8a31\u591a\u60c5\u6cc1\u4e0b\u975e\u5e38\u6709\u7528\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u4fdd\u6301\u72c0\u614b\u7684\u60c5\u6cc1\u4e0b\u3002<\/p>\n<h2 id=\"%e9%96%89%e5%8c%85%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-AQWtrhuIfx\">\u9589\u5305\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u5728 Go \u8a9e\u8a00\u4e2d\uff0c\u9589\u5305\u7684\u8a9e\u6cd5\u76f8\u5c0d\u7c21\u55ae\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u57fa\u672c\u7684\u9589\u5305\u793a\u4f8b\uff1a<\/p>\n<pre><code>package main\n\nimport \"fmt\"\n\nfunc main() {\n    \/\/ \u5b9a\u7fa9\u4e00\u500b\u5916\u90e8\u8b8a\u91cf\n    x := 10\n\n    \/\/ \u5b9a\u7fa9\u4e00\u500b\u9589\u5305\n    addX := func(y int) int {\n        return x + y\n    }\n\n    \/\/ \u4f7f\u7528\u9589\u5305\n    fmt.Println(addX(5)) \/\/ \u8f38\u51fa 15\n}\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u51fd\u6578 <code>addX<\/code> \u662f\u4e00\u500b\u9589\u5305\uff0c\u5b83\u5f15\u7528\u4e86\u5916\u90e8\u8b8a\u91cf <code>x<\/code>\u3002\u5373\u4f7f <code>x<\/code> \u5728 <code>main<\/code> \u51fd\u6578\u4e2d\u88ab\u5b9a\u7fa9\uff0c<code>addX<\/code> \u4ecd\u7136\u53ef\u4ee5\u8a2a\u554f\u5b83\u3002<\/p>\n<h2 id=\"%e9%96%89%e5%8c%85%e7%9a%84%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-AQWtrhuIfx\">\u9589\u5305\u7684\u61c9\u7528\u5834\u666f<\/h2>\n<p>\u9589\u5305\u5728\u8a31\u591a\u5834\u666f\u4e2d\u90fd\u975e\u5e38\u6709\u7528\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u61c9\u7528\uff1a<\/p>\n<ul>\n<li><strong>\u4fdd\u6301\u72c0\u614b\uff1a<\/strong>\u9589\u5305\u53ef\u4ee5\u7528\u4f86\u4fdd\u6301\u72c0\u614b\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u591a\u6b21\u8abf\u7528\u7684\u60c5\u6cc1\u4e0b\u3002<\/li>\n<li><strong>\u51fd\u6578\u5de5\u5ee0\uff1a<\/strong>\u53ef\u4ee5\u4f7f\u7528\u9589\u5305\u4f86\u5275\u5efa\u51fd\u6578\u5de5\u5ee0\uff0c\u6839\u64da\u4e0d\u540c\u7684\u53c3\u6578\u751f\u6210\u4e0d\u540c\u7684\u51fd\u6578\u3002<\/li>\n<li><strong>\u4e8b\u4ef6\u8655\u7406\uff1a<\/strong>\u5728\u4e8b\u4ef6\u9a45\u52d5\u7684\u7de8\u7a0b\u4e2d\uff0c\u9589\u5305\u53ef\u4ee5\u7528\u4f86\u6355\u7372\u4e8b\u4ef6\u8655\u7406\u5668\u7684\u4e0a\u4e0b\u6587\u3002<\/li>\n<\/ul>\n<h3 id=\"%e4%bf%9d%e6%8c%81%e7%8b%80%e6%85%8b%e7%9a%84%e7%a4%ba%e4%be%8b-AQWtrhuIfx\">\u4fdd\u6301\u72c0\u614b\u7684\u793a\u4f8b<\/h3>\n<pre><code>package main\n\nimport \"fmt\"\n\nfunc main() {\n    \/\/ \u5b9a\u7fa9\u4e00\u500b\u8a08\u6578\u5668\n    counter := func() func() int {\n        count := 0\n        return func() int {\n            count++\n            return count\n        }\n    }()\n\n    \/\/ \u4f7f\u7528\u8a08\u6578\u5668\n    fmt.Println(counter()) \/\/ \u8f38\u51fa 1\n    fmt.Println(counter()) \/\/ \u8f38\u51fa 2\n    fmt.Println(counter()) \/\/ \u8f38\u51fa 3\n}\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c<code>counter<\/code> \u51fd\u6578\u8fd4\u56de\u4e86\u4e00\u500b\u9589\u5305\uff0c\u9019\u500b\u9589\u5305\u53ef\u4ee5\u6301\u7e8c\u8ddf\u8e64\u8a08\u6578\u5668\u7684\u72c0\u614b\u3002\u6bcf\u6b21\u8abf\u7528 <code>counter<\/code> \u90fd\u6703\u8fd4\u56de\u7576\u524d\u7684\u8a08\u6578\u503c\u4e26\u5c07\u5176\u589e\u52a0\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-AQWtrhuIfx\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u96d6\u7136\u9589\u5305\u975e\u5e38\u5f37\u5927\uff0c\u4f46\u5728\u4f7f\u7528\u6642\u4e5f\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u9589\u5305\u6703\u6355\u7372\u8b8a\u91cf\u7684\u5f15\u7528\uff0c\u800c\u4e0d\u662f\u8b8a\u91cf\u7684\u503c\uff0c\u56e0\u6b64\u5728\u4f7f\u7528\u6642\u8981\u5c0f\u5fc3\u8b8a\u91cf\u7684\u8b8a\u5316\u3002<\/li>\n<li>\u904e\u5ea6\u4f7f\u7528\u9589\u5305\u53ef\u80fd\u6703\u5c0e\u81f4\u5167\u5b58\u6cc4\u6f0f\uff0c\u7279\u5225\u662f\u5728\u9577\u6642\u9593\u904b\u884c\u7684\u61c9\u7528\u4e2d\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-AQWtrhuIfx\">\u7e3d\u7d50<\/h2>\n<p>\u9589\u5305\u662f Go \u8a9e\u8a00\u4e2d\u4e00\u500b\u5f37\u5927\u800c\u9748\u6d3b\u7684\u7279\u6027\uff0c\u80fd\u5920\u8b93\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u7ba1\u7406\u72c0\u614b\u548c\u884c\u70ba\u3002\u901a\u904e\u672c\u6587\u7684\u4ecb\u7d39\uff0c\u76f8\u4fe1\u8b80\u8005\u5c0d\u9589\u5305\u7684\u6982\u5ff5\u548c\u61c9\u7528\u6709\u4e86\u66f4\u6df1\u5165\u7684\u7406\u89e3\u3002\u5982\u679c\u60a8\u5c0d\u65bc <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u611f\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3 Go \u8a9e\u8a00\u4e2d\u7684\u9589\u5305\uff08Closure\uff09\uff0c\u5b78\u7fd2\u5982\u4f55\u4f7f\u7528\u5f15\u7528\u5916\u90e8\u8b8a\u91cf\u7684\u533f\u540d\u51fd\u6578\u4f86\u63d0\u5347\u7a0b\u5f0f\u8a2d\u8a08\u7684\u9748\u6d3b\u6027\u8207\u6548\u7387\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-57640","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/57640","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=57640"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/57640\/revisions"}],"predecessor-version":[{"id":57641,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/57640\/revisions\/57641"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=57640"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=57640"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=57640"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}