{"id":206520,"date":"2025-06-12T12:15:23","date_gmt":"2025-06-12T04:15:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/206520\/"},"modified":"2025-06-12T12:15:23","modified_gmt":"2025-06-12T04:15:23","slug":"go-%e8%af%ad%e8%a8%80%e4%b8%ad-defer-%e5%87%bd%e6%95%b0%e4%b8%8e%e8%bf%94%e5%9b%9e%e5%80%bc%ef%bc%9a%e4%b8%ba%e4%bb%80%e4%b9%88-f0-%e8%bf%94%e5%9b%9e-0-%e4%bd%86%e6%89%93%e5%8d%b0%e7%bb%93%e6%9e%9c","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/206520\/","title":{"rendered":"Go \u8bed\u8a00\u4e2d defer \u51fd\u6570\u4e0e\u8fd4\u56de\u503c\uff1a\u4e3a\u4ec0\u4e48 f0 \u8fd4\u56de 0 \u4f46\u6253\u5370\u7ed3\u679c\u4e3a 1\uff0cf1 \u672a\u660e\u786e\u8fd4\u56de\u503c\u5374\u6253\u5370\u51fa 0\uff1f"},"content":{"rendered":"

\u73cd\u60dc\u65f6\u95f4\uff0c\u52e4\u594b\u5b66\u4e60\uff01\u4eca\u5929\u7ed9\u5927\u5bb6\u5e26\u6765
\n\u300aGo \u8bed\u8a00\u4e2d defer \u51fd\u6570\u4e0e\u8fd4\u56de\u503c\uff1a\u4e3a\u4ec0\u4e48 f0 \u8fd4\u56de 0 \u4f46\u6253\u5370\u7ed3\u679c\u4e3a 1\uff0cf1 \u672a\u660e\u786e\u8fd4\u56de\u503c\u5374\u6253\u5370\u51fa 0\uff1f\u300b<\/span>\uff0c\u6b63\u6587\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230
\n<\/span>\u7b49\u7b49\uff0c\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60
\nGOLANG<\/span>\uff0c\u6216\u8005\u662f\u5bf9
\nGOLANG<\/span>\u6709\u7591\u95ee\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u6211\uff01\u540e\u9762\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u5185\u5bb9\u7684\uff0c\u5e0c\u671b\u90fd\u80fd\u5e2e\u5230\u6b63\u5728\u5b66\u4e60\u7684\u5927\u5bb6\uff01,
\n,
\n\u51fd\u6570\u8fd4\u56de\u503c\u4e0e\u5ef6\u8fdf\u51fd\u6570\u7684\u56f0\u60d1<\/strong>,\u5728 go \u8bed\u8a00\u4e2d\uff0c\u4f7f\u7528 defer \u51fd\u6570\u5ef6\u8fdf\u6267\u884c\u67d0\u4e9b\u64cd\u4f5c\uff0c\u8fd9\u53ef\u80fd\u5f15\u8d77\u4e00\u4e9b\u56f0\u60d1\u3002\u8ba9\u6211\u4eec\u901a\u8fc7\u793a\u4f8b\u4ee3\u7801\u6765\u4e86\u89e3\u5176\u5de5\u4f5c\u539f\u7406\u3002,
\n\u4f8b\u7a0b\uff1a<\/strong>,
\n\u56f0\u60d1\uff1a<\/strong>,
\n\u89e3\u7b54\uff1a<\/strong>,\u7efc\u4e0a\u6240\u8ff0\uff0c\u5728\u4f7f\u7528\u5ef6\u8fdf\u51fd\u6570\u65f6\uff0c\u9700\u8981\u6ce8\u610f\u5176\u6267\u884c\u987a\u5e8f\u548c\u5bf9\u53d8\u91cf\u7684\u5f71\u54cd\u3002\u4e86\u89e3 go \u8bed\u8a00\u7684\u7c7b\u578b\u7cfb\u7edf\u548c\u9ed8\u8ba4\u503c\u5bf9\u4e8e\u907f\u514d\u6b64\u7c7b\u56f0\u60d1\u81f3\u5173\u91cd\u8981\u3002,\u7ec8\u4e8e\u4ecb\u7ecd\u5b8c\u5566\uff01\u5c0f\u4f19\u4f34\u4eec\uff0c\u8fd9\u7bc7\u5173\u4e8e\u300aGo \u8bed\u8a00\u4e2d defer \u51fd\u6570\u4e0e\u8fd4\u56de\u503c\uff1a\u4e3a\u4ec0\u4e48 f0 \u8fd4\u56de 0 \u4f46\u6253\u5370\u7ed3\u679c\u4e3a 1\uff0cf1 \u672a\u660e\u786e\u8fd4\u56de\u503c\u5374\u6253\u5370\u51fa 0\uff1f\u300b\u7684\u4ecb\u7ecd\u5e94\u8be5\u8ba9\u4f60\u6536\u83b7\u591a\u591a\u4e86\u5427\uff01\u6b22\u8fce\u5927\u5bb6\u6536\u85cf\u6216\u5206\u4eab\u7ed9\u66f4\u591a\u9700\u8981\u5b66\u4e60\u7684\u670b\u53cb\u5427~GOLANG\u516c\u4f17\u53f7\u4e5f\u4f1a\u53d1\u5e03GOLANG\u76f8\u5173\u77e5\u8bc6\uff0c\u5feb\u6765\u5173\u6ce8\u5427\uff01,\u51fd\u6570\u8fd4\u56de\u503c\u4e0e\u5ef6\u8fdf\u51fd\u6570\u7684\u56f0\u60d1,\u73cd\u60dc\u65f6\u95f4\uff0c\u52e4\u594b\u5b66\u4e60\uff01\u4eca\u5929\u7ed9\u5927\u5bb6\u5e26\u6765
\n\u300aGo \u8bed\u8a00\u4e2d defer \u51fd\u6570\u4e0e\u8fd4\u56de\u503c\uff1a\u4e3a\u4ec0\u4e48 f0 \u8fd4\u56de 0 \u4f46\u6253\u5370\u7ed3\u679c\u4e3a 1\uff0cf1 \u672a\u660e\u786e\u8fd4\u56de\u503c\u5374\u6253\u5370\u51fa 0\uff1f\u300b<\/span>\uff0c\u6b63\u6587\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230
\n<\/span>\u7b49\u7b49\uff0c\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60
\nGOLANG<\/span>\uff0c\u6216\u8005\u662f\u5bf9
\nGOLANG<\/span>\u6709\u7591\u95ee\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u6211\uff01\u540e\u9762\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u5185\u5bb9\u7684\uff0c\u5e0c\u671b\u90fd\u80fd\u5e2e\u5230\u6b63\u5728\u5b66\u4e60\u7684\u5927\u5bb6\uff01,
\n<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> Go \u8bed\u8a00\u4e2d defer \u51fd\u6570\u4e0e\u8fd4\u56de\u503c\uff1a\u4e3a\u4ec0\u4e48 f0 \u8fd4\u56de 0 \u4f46\u6253\u5370\u7ed3\u679c\u4e3a 1\uff0cf1 \u672a\u660e\u786e\u8fd4\u56de\u503c\u5374\u6253\u5370\u51fa 0\uff1f<\/span><\/p>\n

Go \u8bed\u8a00\u4e2d defer \u51fd\u6570\u4e0e\u8fd4\u56de\u503c\uff1a\u4e3a\u4ec0\u4e48 f0 \u8fd4\u56de 0 \u4f46\u6253\u5370\u7ed3\u679c\u4e3a 1\uff0cf1 \u672a\u660e\u786e\u8fd4\u56de\u503c\u5374\u6253\u5370\u51fa 0\uff1f<\/h1>\n

2024-11-14 10:34:11<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u73cd\u60dc\u65f6\u95f4\uff0c\u52e4\u594b\u5b66\u4e60\uff01\u4eca\u5929\u7ed9\u5927\u5bb6\u5e26\u6765\u300aGo \u8bed\u8a00\u4e2d defer \u51fd\u6570\u4e0e\u8fd4\u56de\u503c\uff1a\u4e3a\u4ec0\u4e48 f0 \u8fd4\u56de 0 \u4f46\u6253\u5370\u7ed3\u679c\u4e3a 1\uff0cf1 \u672a\u660e\u786e\u8fd4\u56de\u503c\u5374\u6253\u5370\u51fa 0\uff1f\u300b<\/span>\uff0c\u6b63\u6587\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\uff0c\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60GOLANG<\/span>\uff0c\u6216\u8005\u662f\u5bf9GOLANG<\/span>\u6709\u7591\u95ee\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u6211\uff01\u540e\u9762\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u5185\u5bb9\u7684\uff0c\u5e0c\u671b\u90fd\u80fd\u5e2e\u5230\u6b63\u5728\u5b66\u4e60\u7684\u5927\u5bb6\uff01<\/p>\n

<\/p>\n

\u51fd\u6570\u8fd4\u56de\u503c\u4e0e\u5ef6\u8fdf\u51fd\u6570\u7684\u56f0\u60d1<\/strong><\/p>\n

\u5728 go \u8bed\u8a00\u4e2d\uff0c\u4f7f\u7528 defer \u51fd\u6570\u5ef6\u8fdf\u6267\u884c\u67d0\u4e9b\u64cd\u4f5c\uff0c\u8fd9\u53ef\u80fd\u5f15\u8d77\u4e00\u4e9b\u56f0\u60d1\u3002\u8ba9\u6211\u4eec\u901a\u8fc7\u793a\u4f8b\u4ee3\u7801\u6765\u4e86\u89e3\u5176\u5de5\u4f5c\u539f\u7406\u3002<\/p>\n

\u4f8b\u7a0b\uff1a<\/strong><\/p>\n

package main\n\nimport (\n    \"fmt\"\n)\n\nfunc main() {\n    fmt.Println(f0()) \/\/ 1\n    fmt.Println(f1()) \/\/ 0\n}\n\nfunc f0() (result int) {\n    defer func() {\n        result++\n    }()\n    return 0\n}\n\nfunc f1() (result int) {\n    result = 0 \/\/return\u8bed\u53e5\u4e0d\u662f\u4e00\u6761\u539f\u5b50\u8c03\u7528\uff0creturn xxx\u5176\u5b9e\u662f\u8d4b\u503c\uff0bRET\u6307\u4ee4\n    return\n}<\/pre>\n
\u56f0\u60d1\uff1a<\/strong><\/p>\n
    \n
  1. f0 \u4e2d\u8fd4\u56de\u7684\u662f 0\uff0c\u4f46\u5728\u6253\u5370\u65f6\u5374\u53d8\u6210\u4e86 1\u3002<\/li>\n
  2. f1 \u4e2d\u6ca1\u6709\u660e\u786e\u8fd4\u56de\u4efb\u4f55\u503c\uff0c\u4f46\u6253\u5370\u65f6\u5374\u4e3a 0\u3002<\/li>\n<\/ol>\n
    \u89e3\u7b54\uff1a<\/strong><\/p>\n
      \n
    1. defer \u51fd\u6570\u5728 return \u4e4b\u524d\u6267\u884c\u3002\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0cdefer \u51fd\u6570\u5bf9\u53d8\u91cf result \u8fdb\u884c\u81ea\u589e\uff0c\u56e0\u6b64\u8fd4\u56de\u7684\u503c\u4e3a 1\uff0c\u800c\u4e0d\u662f 0\u3002<\/li>\n
    2. \u5728 go \u8bed\u8a00\u4e2d\uff0c\u6ca1\u6709 null \u503c\u3002int \u7c7b\u578b\u53d8\u91cf\u7684\u9ed8\u8ba4\u503c\u4e3a 0\uff0cslice \u548c map \u7b49\u590d\u5408\u7c7b\u578b\u7684\u9ed8\u8ba4\u503c\u4e3a nil\u3002\u56e0\u6b64\uff0cf1 \u4e2d\u7684 result \u53d8\u91cf\u88ab\u9690\u5f0f\u521d\u59cb\u5316\u4e3a 0\uff0c\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u6253\u5370\u65f6\u663e\u793a\u4e3a 0\u3002<\/li>\n<\/ol>\n
      \u7efc\u4e0a\u6240\u8ff0\uff0c\u5728\u4f7f\u7528\u5ef6\u8fdf\u51fd\u6570\u65f6\uff0c\u9700\u8981\u6ce8\u610f\u5176\u6267\u884c\u987a\u5e8f\u548c\u5bf9\u53d8\u91cf\u7684\u5f71\u54cd\u3002\u4e86\u89e3 go \u8bed\u8a00\u7684\u7c7b\u578b\u7cfb\u7edf\u548c\u9ed8\u8ba4\u503c\u5bf9\u4e8e\u907f\u514d\u6b64\u7c7b\u56f0\u60d1\u81f3\u5173\u91cd\u8981\u3002<\/p>\n
      \u7ec8\u4e8e\u4ecb\u7ecd\u5b8c\u5566\uff01\u5c0f\u4f19\u4f34\u4eec\uff0c\u8fd9\u7bc7\u5173\u4e8e\u300aGo \u8bed\u8a00\u4e2d defer \u51fd\u6570\u4e0e\u8fd4\u56de\u503c\uff1a\u4e3a\u4ec0\u4e48 f0 \u8fd4\u56de 0 \u4f46\u6253\u5370\u7ed3\u679c\u4e3a 1\uff0cf1 \u672a\u660e\u786e\u8fd4\u56de\u503c\u5374\u6253\u5370\u51fa 0\uff1f\u300b\u7684\u4ecb\u7ecd\u5e94\u8be5\u8ba9\u4f60\u6536\u83b7\u591a\u591a\u4e86\u5427\uff01\u6b22\u8fce\u5927\u5bb6\u6536\u85cf\u6216\u5206\u4eab\u7ed9\u66f4\u591a\u9700\u8981\u5b66\u4e60\u7684\u670b\u53cb\u5427~GOLANG\u516c\u4f17\u53f7\u4e5f\u4f1a\u53d1\u5e03GOLANG\u76f8\u5173\u77e5\u8bc6\uff0c\u5feb\u6765\u5173\u6ce8\u5427\uff01<\/p>\n
      \n
      \n <\/dt>\n
      \n   \u5982\u4f55\u5728 Go \u7ed3\u6784\u4f53\u7684 map \u5b57\u6bb5\u4e2d\u4f18\u96c5\u5730\u81ea\u52a8\u521d\u59cb\u5316\u503c\uff1f\n <\/dd>\n<\/dl>\n
      \n
      \n <\/dt>\n
      \n   \u5982\u4f55\u9009\u62e9\u9002\u5408\u81ea\u5df1\u7684\u670d\u52a1\u5668\u7535\u8111\u914d\u7f6e\uff1f\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
      \u73cd\u60dc\u65f6\u95f4\uff0c\u52e4\u594b\u5b66\u4e60\uff01\u4eca\u5929\u7ed9\u5927\u5bb6\u5e26...<\/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-206520","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206520","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=206520"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206520\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=206520"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=206520"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=206520"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}