{"id":206157,"date":"2025-06-12T13:36:29","date_gmt":"2025-06-12T05:36:29","guid":{"rendered":"https:\/\/server.hk\/cnblog\/206157\/"},"modified":"2025-06-12T13:36:29","modified_gmt":"2025-06-12T05:36:29","slug":"%e4%b8%ba%e4%bb%80%e4%b9%88-go-%e4%b8%ad-defer-%e5%87%bd%e6%95%b0%e7%9a%84%e6%89%93%e5%8d%b0%e7%bb%93%e6%9e%9c%e4%b8%8e%e9%a2%84%e6%9c%9f%e4%b8%8d%e4%b8%80%e8%87%b4%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/206157\/","title":{"rendered":"\u4e3a\u4ec0\u4e48 Go \u4e2d defer \u51fd\u6570\u7684\u6253\u5370\u7ed3\u679c\u4e0e\u9884\u671f\u4e0d\u4e00\u81f4\uff1f"},"content":{"rendered":"

\u4eca\u5929GOLANG\u7ed9\u5927\u5bb6\u5e26\u6765\u4e86
\n\u300a\u4e3a\u4ec0\u4e48 Go \u4e2d defer \u51fd\u6570\u7684\u6253\u5370\u7ed3\u679c\u4e0e\u9884\u671f\u4e0d\u4e00\u81f4\uff1f\u300b<\/span>\uff0c\u5176\u4e2d\u6d89\u53ca\u5230\u7684\u77e5\u8bc6\u70b9\u5305\u62ec
\n<\/span>\u7b49\u7b49\uff0c\u65e0\u8bba\u4f60\u662f\u5c0f\u767d\u8fd8\u662f\u8001\u624b\uff0c\u90fd\u9002\u5408\u770b\u4e00\u770b\u54e6~\u6709\u597d\u7684\u5efa\u8bae\u4e5f\u6b22\u8fce\u5927\u5bb6\u5728\u8bc4\u8bba\u7559\u8a00\uff0c\u82e5\u662f\u770b\u5b8c\u6709\u6240\u6536\u83b7\uff0c\u4e5f\u5e0c\u671b\u5927\u5bb6\u80fd\u591a\u591a\u70b9\u8d5e\u652f\u6301\u5440\uff01\u4e00\u8d77\u52a0\u6cb9\u5b66\u4e60~,
\n,
\n\u4e3a\u4ec0\u4e48 go \u4e2d defer \u51fd\u6570\u6253\u5370\u7ed3\u679c\u4e0e\u9884\u671f\u4e0d\u540c\uff1f<\/strong>,\u5728 go \u4e2d\u4f7f\u7528 defer \u5ef6\u8fdf\u6267\u884c\u51fd\u6570\u65f6\uff0c\u53ef\u80fd\u4f1a\u9047\u5230\u6253\u5370\u7ed3\u679c\u4e0e\u9884\u671f\u4e0d\u540c\u7684\u60c5\u51b5\u3002\u672c\u6587\u5c06\u89e3\u91ca\u4e00\u4e2a\u5e38\u89c1\u7684\u6848\u4f8b\u3002,
\n\u95ee\u9898\uff1a<\/strong>,\u4e0b\u65b9\u7684 go \u4ee3\u7801\u5c06\u6253\u5370\u4ec0\u4e48\u7ed3\u679c\uff1f,
\n\u7b54\u6848\uff1a<\/strong>,\u6253\u5370\u7ed3\u679c\u662f\uff1a,
\n\u89e3\u91ca\uff1a<\/strong>,defer \u9075\u5faa\u540e\u8fdb\u5148\u51fa\uff08lifo\uff09\u539f\u5219\uff0c\u8fd9\u610f\u5473\u7740\u6700\u540e\u6ce8\u518c\u7684\u51fd\u6570\u5c06\u6700\u5148\u6267\u884c\u3002\u5bf9\u4e8e\u4e0a\u9762\u7684\u4ee3\u7801\uff1a,\u56e0\u6b64\uff0c\u6700\u7ec8\u6253\u5370\u7684\u7ed3\u679c\u662f 2\u30011 \u548c 2\u3002,\u8fd8\u9700\u8981\u6ce8\u610f\uff0c\u5728\u6ce8\u518c defer \u51fd\u6570\u65f6\uff0c\u8be5\u51fd\u6570\u7684\u53c2\u6570\u5fc5\u987b\u5df2\u786e\u5b9a\u5176\u503c\u3002\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u7b2c\u4e8c\u4e2a defer \u51fd\u6570\u7684 a \u53c2\u6570\u5728\u6ce8\u518c\u65f6\u88ab\u8d4b\u503c\u4e3a 1\u3002\u5f53\u51fd\u6570\u6267\u884c\u65f6\uff0c\u5b83\u4ecd\u5c06\u6253\u5370 1\uff0c\u5373\u4f7f a \u7684\u503c\u5df2\u5728 main \u51fd\u6570\u4e2d\u589e\u52a0\u3002,\u6587\u4e2d\u5173\u4e8e\u7684\u77e5\u8bc6\u4ecb\u7ecd\uff0c\u5e0c\u671b\u5bf9\u4f60\u7684\u5b66\u4e60\u6709\u6240\u5e2e\u52a9\uff01\u82e5\u662f\u53d7\u76ca\u532a\u6d45\uff0c\u90a3\u5c31\u52a8\u52a8\u9f20\u6807\u6536\u85cf\u8fd9\u7bc7\u300a\u4e3a\u4ec0\u4e48 Go \u4e2d defer \u51fd\u6570\u7684\u6253\u5370\u7ed3\u679c\u4e0e\u9884\u671f\u4e0d\u4e00\u81f4\uff1f\u300b\u6587\u7ae0\u5427\uff0c\u4e5f\u53ef\u5173\u6ce8GOLANG\u516c\u4f17\u53f7\u4e86\u89e3\u76f8\u5173\u6280\u672f\u6587\u7ae0\u3002,\u4e3a\u4ec0\u4e48 go \u4e2d defer \u51fd\u6570\u6253\u5370\u7ed3\u679c\u4e0e\u9884\u671f\u4e0d\u540c\uff1f,\u4eca\u5929GOLANG\u7ed9\u5927\u5bb6\u5e26\u6765\u4e86
\n\u300a\u4e3a\u4ec0\u4e48 Go \u4e2d defer \u51fd\u6570\u7684\u6253\u5370\u7ed3\u679c\u4e0e\u9884\u671f\u4e0d\u4e00\u81f4\uff1f\u300b<\/span>\uff0c\u5176\u4e2d\u6d89\u53ca\u5230\u7684\u77e5\u8bc6\u70b9\u5305\u62ec
\n<\/span>\u7b49\u7b49\uff0c\u65e0\u8bba\u4f60\u662f\u5c0f\u767d\u8fd8\u662f\u8001\u624b\uff0c\u90fd\u9002\u5408\u770b\u4e00\u770b\u54e6~\u6709\u597d\u7684\u5efa\u8bae\u4e5f\u6b22\u8fce\u5927\u5bb6\u5728\u8bc4\u8bba\u7559\u8a00\uff0c\u82e5\u662f\u770b\u5b8c\u6709\u6240\u6536\u83b7\uff0c\u4e5f\u5e0c\u671b\u5927\u5bb6\u80fd\u591a\u591a\u70b9\u8d5e\u652f\u6301\u5440\uff01\u4e00\u8d77\u52a0\u6cb9\u5b66\u4e60~,
\n<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> \u4e3a\u4ec0\u4e48 Go \u4e2d defer \u51fd\u6570\u7684\u6253\u5370\u7ed3\u679c\u4e0e\u9884\u671f\u4e0d\u4e00\u81f4\uff1f<\/span><\/p>\n

\u4e3a\u4ec0\u4e48 Go \u4e2d defer \u51fd\u6570\u7684\u6253\u5370\u7ed3\u679c\u4e0e\u9884\u671f\u4e0d\u4e00\u81f4\uff1f<\/h1>\n

2024-11-05 09:21:58<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u4eca\u5929GOLANG\u7ed9\u5927\u5bb6\u5e26\u6765\u4e86\u300a\u4e3a\u4ec0\u4e48 Go \u4e2d defer \u51fd\u6570\u7684\u6253\u5370\u7ed3\u679c\u4e0e\u9884\u671f\u4e0d\u4e00\u81f4\uff1f\u300b<\/span>\uff0c\u5176\u4e2d\u6d89\u53ca\u5230\u7684\u77e5\u8bc6\u70b9\u5305\u62ec<\/span>\u7b49\u7b49\uff0c\u65e0\u8bba\u4f60\u662f\u5c0f\u767d\u8fd8\u662f\u8001\u624b\uff0c\u90fd\u9002\u5408\u770b\u4e00\u770b\u54e6~\u6709\u597d\u7684\u5efa\u8bae\u4e5f\u6b22\u8fce\u5927\u5bb6\u5728\u8bc4\u8bba\u7559\u8a00\uff0c\u82e5\u662f\u770b\u5b8c\u6709\u6240\u6536\u83b7\uff0c\u4e5f\u5e0c\u671b\u5927\u5bb6\u80fd\u591a\u591a\u70b9\u8d5e\u652f\u6301\u5440\uff01\u4e00\u8d77\u52a0\u6cb9\u5b66\u4e60~<\/p>\n

<\/p>\n

\u4e3a\u4ec0\u4e48 go \u4e2d defer \u51fd\u6570\u6253\u5370\u7ed3\u679c\u4e0e\u9884\u671f\u4e0d\u540c\uff1f<\/strong><\/p>\n

\u5728 go \u4e2d\u4f7f\u7528 defer \u5ef6\u8fdf\u6267\u884c\u51fd\u6570\u65f6\uff0c\u53ef\u80fd\u4f1a\u9047\u5230\u6253\u5370\u7ed3\u679c\u4e0e\u9884\u671f\u4e0d\u540c\u7684\u60c5\u51b5\u3002\u672c\u6587\u5c06\u89e3\u91ca\u4e00\u4e2a\u5e38\u89c1\u7684\u6848\u4f8b\u3002<\/p>\n

\u95ee\u9898\uff1a<\/strong><\/p>\n

\u4e0b\u65b9\u7684 go \u4ee3\u7801\u5c06\u6253\u5370\u4ec0\u4e48\u7ed3\u679c\uff1f<\/p>\n

package main\n\nimport \"fmt\"\n\nfunc main() {\n  a := 1\n  defer func() { fmt.println(a) }()\n  defer func(a int) { fmt.println(a) }(a)\n  defer fmt.println(a)\n\n  a++\n}<\/pre>\n
\u7b54\u6848\uff1a<\/strong><\/p>\n
\u6253\u5370\u7ed3\u679c\u662f\uff1a<\/p>\n
2\n1\n2<\/pre>\n
\u89e3\u91ca\uff1a<\/strong><\/p>\n
defer \u9075\u5faa\u540e\u8fdb\u5148\u51fa\uff08lifo\uff09\u539f\u5219\uff0c\u8fd9\u610f\u5473\u7740\u6700\u540e\u6ce8\u518c\u7684\u51fd\u6570\u5c06\u6700\u5148\u6267\u884c\u3002\u5bf9\u4e8e\u4e0a\u9762\u7684\u4ee3\u7801\uff1a<\/p>\n
    \n
  1. a++\uff1a\u5c06 a \u7684\u503c\u589e\u52a0\u5230 2\u3002<\/li>\n
  2. \n
    \u6267\u884c defer \u51fd\u6570\uff1a<\/p>\n
      \n
    • \u7b2c\u4e09\u4e2a defer \u8c03\u7528\u4e86\u65e0\u53c2\u51fd\u6570\uff0c\u5b83\u5c06\u5728 main \u51fd\u6570\u8fd4\u56de\u65f6\u6253\u5370 a \u7684\u5f53\u524d\u503c\uff082\uff09\u3002<\/li>\n
    • \u7b2c\u4e8c\u4e2a defer \u8c03\u7528\u4e86\u5e26\u53c2\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u63a5\u53d7 a \u53c2\u6570\u3002\u5f53\u51fd\u6570\u6267\u884c\u65f6\uff0c\u5b83\u5c06\u6253\u5370\u5b83\u5728\u6ce8\u518c\u65f6\u4fdd\u5b58\u7684 a \u503c\uff081\uff09\u3002<\/li>\n
    • \u7b2c\u4e00\u4e2a defer \u8c03\u7528\u4e86\u65e0\u53c2\u51fd\u6570\uff0c\u5b83\u5c06\u5728 main \u51fd\u6570\u8fd4\u56de\u65f6\u6253\u5370 a \u7684\u5f53\u524d\u503c\uff082\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n
      \u56e0\u6b64\uff0c\u6700\u7ec8\u6253\u5370\u7684\u7ed3\u679c\u662f 2\u30011 \u548c 2\u3002<\/p>\n
      \u8fd8\u9700\u8981\u6ce8\u610f\uff0c\u5728\u6ce8\u518c defer \u51fd\u6570\u65f6\uff0c\u8be5\u51fd\u6570\u7684\u53c2\u6570\u5fc5\u987b\u5df2\u786e\u5b9a\u5176\u503c\u3002\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u7b2c\u4e8c\u4e2a defer \u51fd\u6570\u7684 a \u53c2\u6570\u5728\u6ce8\u518c\u65f6\u88ab\u8d4b\u503c\u4e3a 1\u3002\u5f53\u51fd\u6570\u6267\u884c\u65f6\uff0c\u5b83\u4ecd\u5c06\u6253\u5370 1\uff0c\u5373\u4f7f a \u7684\u503c\u5df2\u5728 main \u51fd\u6570\u4e2d\u589e\u52a0\u3002<\/p>\n
      \u6587\u4e2d\u5173\u4e8e\u7684\u77e5\u8bc6\u4ecb\u7ecd\uff0c\u5e0c\u671b\u5bf9\u4f60\u7684\u5b66\u4e60\u6709\u6240\u5e2e\u52a9\uff01\u82e5\u662f\u53d7\u76ca\u532a\u6d45\uff0c\u90a3\u5c31\u52a8\u52a8\u9f20\u6807\u6536\u85cf\u8fd9\u7bc7\u300a\u4e3a\u4ec0\u4e48 Go \u4e2d defer \u51fd\u6570\u7684\u6253\u5370\u7ed3\u679c\u4e0e\u9884\u671f\u4e0d\u4e00\u81f4\uff1f\u300b\u6587\u7ae0\u5427\uff0c\u4e5f\u53ef\u5173\u6ce8GOLANG\u516c\u4f17\u53f7\u4e86\u89e3\u76f8\u5173\u6280\u672f\u6587\u7ae0\u3002<\/p>\n
      \n
      \n <\/dt>\n
      \n   \u5982\u4f55\u5229\u7528 Django ORM \u5728 MySQL \u4e2d\u4f7f\u7528 NOW() \u51fd\u6570\u8bbe\u7f6e\u65f6\u95f4\u6233\uff1f\n <\/dd>\n<\/dl>\n
      \n
      \n <\/dt>\n
      \n   \u7535\u8111\u5185\u5b58\u6e05\u7406\uff1a\u51e0\u62db\u8ba9\u7535\u8111\u201c\u547c\u5438\u201d\u66f4\u987a\u7545\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
      \u4eca\u5929GOLANG\u7ed9\u5927\u5bb6\u5e26\u6765\u4e86 \u300a...<\/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-206157","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206157","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=206157"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206157\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=206157"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=206157"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=206157"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}