{"id":841,"date":"2024-11-07T11:06:19","date_gmt":"2024-11-07T03:06:19","guid":{"rendered":"https:\/\/fwq.ai\/blog\/841\/"},"modified":"2024-11-07T11:06:19","modified_gmt":"2024-11-07T03:06:19","slug":"go-defer-%e8%af%ad%e5%8f%a5%e6%89%a7%e8%a1%8c%e9%a1%ba%e5%ba%8f%ef%bc%9a%e4%b8%ba%e4%bb%80%e4%b9%88%e4%bb%a3%e7%a0%81%e8%be%93%e5%87%ba-221%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/841\/","title":{"rendered":"Go defer \u8bed\u53e5\u6267\u884c\u987a\u5e8f\uff1a\u4e3a\u4ec0\u4e48\u4ee3\u7801\u8f93\u51fa 221\uff1f"},"content":{"rendered":"

\"Go<\/p>\n

go\u6253\u5370defer\u5206\u6790<\/strong><\/p>\n

\u5728\u4ee5\u4e0b\u4ee3\u7801\u4e2d\uff1a<\/p>\n

package main\n\nimport \"fmt\"\n\nfunc main() {\n  a := 1\n  defer fmt.println(a)\n  a++\n  defer fmt.println(a)\n  defer func(a int) { fmt.println(a) }(a)\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u7a0b\u5e8f\u7684\u6253\u5370\u7ed3\u679c\u4e3a\uff1a<\/p>\n
2\n2\n1<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u7406\u89e3\u6253\u5370\u987a\u5e8f<\/strong><\/p>\n
\u8fd9\u4e2a\u95ee\u9898\u6d89\u53ca\u5230go\u8bed\u8a00\u4e2ddefer\u5173\u952e\u5b57\u7684\u4f7f\u7528\u3002defer\u6307\u5ef6\u8fdf\u6267\u884c\u7684\u610f\u601d\uff0c\u5373\u5728\u5f53\u524d\u51fd\u6570\u8fd4\u56de\u524d\u6267\u884cdefer\u540e\u9762\u7684\u51fd\u6570\u3002<\/p>\n
defwer\u51fd\u6570\u9075\u5faa\u540e\u8fdb\u5148\u51fa\u7684\u539f\u5219\uff0c\u56e0\u6b64\u6267\u884c\u987a\u5e8f\u4e3a\uff1a<\/p>\n
    \n
  1. func(a int) { fmt.println(a) }<\/li>\n
  2. fmt.println(a)<\/li>\n
  3. fmt.println(a)<\/li>\n<\/ol>\n
    \u7406\u89e3\u53c2\u6570\u4f20\u9012<\/strong><\/p>\n
    defwer\u6ce8\u518c\u8981\u5ef6\u8fdf\u6267\u884c\u7684\u51fd\u6570\u65f6\uff0c\u8be5\u51fd\u6570\u6240\u6709\u7684\u53c2\u6570\u90fd\u9700\u8981\u786e\u5b9a\u5176\u503c\u3002\u56e0\u6b64\u5728\u4ee3\u7801\u4e2d\uff0ca++\u64cd\u4f5c\u662f\u5728defer\u51fd\u6570\u6ce8\u518c\u4e4b\u540e\u6267\u884c\u7684\u3002<\/p>\n
    \u5728\u7b2c\u4e00\u4e2adefer\u51fd\u6570\u4e2d\uff0cfunc(a int) { fmt.println(a) }\uff0c\u53c2\u6570a\u5728\u6ce8\u518c\u65f6\u88ab\u8d4b\u503c\u4e3a\u6b64\u65f6\u7684\u5b9e\u53c2a=1\u3002\u968f\u540e\u6267\u884c\u8f93\u51fa1\u3002<\/p>\n
    \u5728\u7b2c\u4e8c\u4e2adefer\u51fd\u6570\u4e2d\uff0cfmt.println(a)\uff0c\u53c2\u6570a\u4e5f\u540c\u6837\u5728\u6ce8\u518c\u65f6\u88ab\u8d4b\u503c\u4e3a\u6b64\u65f6\u7684\u5b9e\u53c2a=1\u3002<\/p>\n
    \u5728\u7b2c\u4e09\u4e2adefer\u51fd\u6570\u4e2d\uff0c\u65e0\u53c2\u51fd\u6570\uff0c\u6267\u884c\u65f6\u5148\u4e0a\u5bfb\u627e\u53c2\u6570a\uff08\u6b64\u65f6\u4e3a2\uff09\u3002<\/p>\n
    \u4ee5\u4e0a\u5c31\u662fGo defer \u8bed\u53e5\u6267\u884c\u987a\u5e8f\uff1a\u4e3a\u4ec0\u4e48\u4ee3\u7801\u8f93\u51fa 221\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
    go\u6253\u5370defer\u5206\u6790 \u5728\u4ee5\u4e0b\u4ee3\u7801\u4e2d\uff1a package main import “fmt” func main() { a := 1 defer fmt.println(a) a++ defer fmt.println(a) defer func(a int) { fmt.println(a) }(a) } \u767b\u5f55\u540e\u590d\u5236 \u7a0b\u5e8f\u7684\u6253\u5370\u7ed3\u679c\u4e3a\uff1a 2 2 1 \u767b\u5f55\u540e\u590d\u5236 \u7406\u89e3\u6253\u5370\u987a\u5e8f \u8fd9\u4e2a\u95ee\u9898\u6d89\u53ca\u5230go\u8bed\u8a00\u4e2ddefer\u5173\u952e\u5b57\u7684\u4f7f\u7528\u3002defer\u6307\u5ef6\u8fdf\u6267\u884c\u7684\u610f\u601d\uff0c\u5373\u5728\u5f53\u524d\u51fd\u6570\u8fd4\u56de\u524d\u6267\u884cdefer\u540e\u9762\u7684\u51fd\u6570\u3002 defwer\u51fd\u6570\u9075\u5faa\u540e\u8fdb\u5148\u51fa\u7684\u539f\u5219\uff0c\u56e0\u6b64\u6267\u884c\u987a\u5e8f\u4e3a\uff1a func(a int) { fmt.println(a) } fmt.println(a) fmt.println(a) \u7406\u89e3\u53c2\u6570\u4f20\u9012 defwer\u6ce8\u518c\u8981\u5ef6\u8fdf\u6267\u884c\u7684\u51fd\u6570\u65f6\uff0c\u8be5\u51fd\u6570\u6240\u6709\u7684\u53c2\u6570\u90fd\u9700\u8981\u786e\u5b9a\u5176\u503c\u3002\u56e0\u6b64\u5728\u4ee3\u7801\u4e2d\uff0ca++\u64cd\u4f5c\u662f\u5728defer\u51fd\u6570\u6ce8\u518c\u4e4b\u540e\u6267\u884c\u7684\u3002 \u5728\u7b2c\u4e00\u4e2adefer\u51fd\u6570\u4e2d\uff0cfunc(a int) { fmt.println(a) }\uff0c\u53c2\u6570a\u5728\u6ce8\u518c\u65f6\u88ab\u8d4b\u503c\u4e3a\u6b64\u65f6\u7684\u5b9e\u53c2a=1\u3002\u968f\u540e\u6267\u884c\u8f93\u51fa1\u3002 \u5728\u7b2c\u4e8c\u4e2adefer\u51fd\u6570\u4e2d\uff0cfmt.println(a)\uff0c\u53c2\u6570a\u4e5f\u540c\u6837\u5728\u6ce8\u518c\u65f6\u88ab\u8d4b\u503c\u4e3a\u6b64\u65f6\u7684\u5b9e\u53c2a=1\u3002 \u5728\u7b2c\u4e09\u4e2adefer\u51fd\u6570\u4e2d\uff0c\u65e0\u53c2\u51fd\u6570\uff0c\u6267\u884c\u65f6\u5148\u4e0a\u5bfb\u627e\u53c2\u6570a\uff08\u6b64\u65f6\u4e3a2\uff09\u3002 \u4ee5\u4e0a\u5c31\u662fGo defer \u8bed\u53e5\u6267\u884c\u987a\u5e8f\uff1a\u4e3a\u4ec0\u4e48\u4ee3\u7801\u8f93\u51fa 221\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-841","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/841","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=841"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/841\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=841"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=841"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=841"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}