{"id":205585,"date":"2025-06-12T08:46:44","date_gmt":"2025-06-12T00:46:44","guid":{"rendered":"https:\/\/server.hk\/cnblog\/205585\/"},"modified":"2025-06-12T08:46:44","modified_gmt":"2025-06-12T00:46:44","slug":"golang-%e5%87%bd%e6%95%b0%ef%bc%9a%e7%b1%bb%e5%9e%8b%e6%96%ad%e8%a8%80%e5%9c%a8-nil-%e5%80%bc%e4%b8%8a%e7%9a%84%e8%a1%8c%e4%b8%ba%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/205585\/","title":{"rendered":"Golang \u51fd\u6570\uff1a\u7c7b\u578b\u65ad\u8a00\u5728 nil \u503c\u4e0a\u7684\u884c\u4e3a\uff1f"},"content":{"rendered":"

\u5b66\u4e60\u77e5\u8bc6\u8981\u5584\u4e8e\u601d\u8003\uff0c\u601d\u8003\uff0c\u518d\u601d\u8003\uff01\u4eca\u5929GOLANG\u5c0f\u7f16\u5c31\u7ed9\u5927\u5bb6\u5e26\u6765\u300aGOLANG \u51fd\u6570\uff1a\u7c7b\u578b\u65ad\u8a00\u5728 nil \u503c\u4e0a\u7684\u884c\u4e3a\uff1f\u300b<\/span>\uff0c\u4ee5\u4e0b\u5185\u5bb9\u4e3b\u8981\u5305\u542b<\/span>\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60\u6216\u51c6\u5907\u5b66\u4e60GOLANG<\/span>\uff0c\u5c31\u90fd\u4e0d\u8981\u9519\u8fc7\u672c\u6587\u5566~\u8ba9\u6211\u4eec\u4e00\u8d77\u6765\u770b\u770b\u5427\uff0c\u80fd\u5e2e\u52a9\u5230\u4f60\u5c31\u66f4\u597d\u4e86\uff01<\/span>,\u5bf9\u4e8e nil \u503c\u8fdb\u884c\u7c7b\u578b\u65ad\u8a00\u65f6\uff0cvalue \u5c06\u4e3a nil\uff0cok \u5c06\u4e3a false\uff0c\u56e0\u4e3a nil \u4e0d\u662f\u4efb\u4f55\u7c7b\u578b\u7684\u5177\u4f53\u5b9e\u4f8b\u3002,
\n,\u7c7b\u578b\u65ad\u8a00\u5141\u8bb8\u6211\u4eec\u5c06\u63a5\u53e3\u503c\u8f6c\u6362\u4e3a\u7279\u5b9a\u7c7b\u578b\u7684\u5177\u4f53\u503c\u3002Go \u4e2d\u7c7b\u578b\u65ad\u8a00\u91c7\u7528\u4ee5\u4e0b\u8bed\u6cd5\uff1a,\u5176\u4e2d\uff1a,\u5f53\u6211\u4eec\u5bf9 nil \u503c\u8fdb\u884c\u7c7b\u578b\u65ad\u8a00\u65f6\uff0c
\nvalue<\/code> \u5c06\u4e3a
\nnil<\/strong>\uff0c
\nok<\/code> \u5c06\u4e3a
\nfalse<\/strong>\u3002\u8fd9\u662f\u56e0\u4e3a nil \u4e0d\u662f\u4efb\u4f55\u7c7b\u578b\u7684\u5177\u4f53\u5b9e\u4f8b\u3002,\u8003\u8651\u4ee5\u4e0b\u4ee3\u7801\uff1a,\u8f93\u51fa\uff1a,\u5982\u4f60\u6240\u89c1\uff0c\u5373\u4f7f\u6211\u4eec\u5bf9 nil \u6307\u9488\u548c nil \u503c\u8fdb\u884c\u7c7b\u578b\u65ad\u8a00\uff0c\u7ed3\u679c\u90fd\u662f\u4e00\u6837\u7684\uff0c\u5373
\nvalue<\/code> \u4e3a
\nnil<\/strong>\uff0c
\nok<\/code> \u4e3a
\nfalse<\/strong>\u3002,\u4eca\u5929\u5173\u4e8e\u300aGOLANG \u51fd\u6570\uff1a\u7c7b\u578b\u65ad\u8a00\u5728 nil \u503c\u4e0a\u7684\u884c\u4e3a\uff1f\u300b\u7684\u5185\u5bb9\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\uff0c\u5982\u679c\u6709\u4ec0\u4e48\u7591\u95ee\u6216\u8005\u5efa\u8bae\uff0c\u53ef\u4ee5\u5728GOLANG\u516c\u4f17\u53f7\u4e0b\u591a\u591a\u56de\u590d\u4ea4\u6d41\uff1b\u6587\u4e2d\u82e5\u6709\u4e0d\u6b63\u4e4b\u5904\uff0c\u4e5f\u5e0c\u671b\u56de\u590d\u7559\u8a00\u4ee5\u544a\u77e5\uff01,
\nok<\/code> \u662f\u4e00\u4e2a\u5e03\u5c14\u503c\uff0c\u8868\u793a\u8f6c\u6362\u662f\u5426\u6210\u529f\u3002,
\nvalue<\/code> \u662f\u8f6c\u6362\u540e\u7684\u5177\u4f53\u503c\u3002,
\n\u5b66\u4e60\u77e5\u8bc6\u8981\u5584\u4e8e\u601d\u8003\uff0c\u601d\u8003\uff0c\u518d\u601d\u8003\uff01\u4eca\u5929GOLANG\u5c0f\u7f16\u5c31\u7ed9\u5927\u5bb6\u5e26\u6765\u300aGOLANG \u51fd\u6570\uff1a\u7c7b\u578b\u65ad\u8a00\u5728 nil \u503c\u4e0a\u7684\u884c\u4e3a\uff1f\u300b<\/span>\uff0c\u4ee5\u4e0b\u5185\u5bb9\u4e3b\u8981\u5305\u542b<\/span>\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60\u6216\u51c6\u5907\u5b66\u4e60GOLANG<\/span>\uff0c\u5c31\u90fd\u4e0d\u8981\u9519\u8fc7\u672c\u6587\u5566~\u8ba9\u6211\u4eec\u4e00\u8d77\u6765\u770b\u770b\u5427\uff0c\u80fd\u5e2e\u52a9\u5230\u4f60\u5c31\u66f4\u597d\u4e86\uff01<\/span>,
\n<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> GOLANG \u51fd\u6570\uff1a\u7c7b\u578b\u65ad\u8a00\u5728 nil \u503c\u4e0a\u7684\u884c\u4e3a\uff1f<\/span><\/p>\n

GOLANG \u51fd\u6570\uff1a\u7c7b\u578b\u65ad\u8a00\u5728 nil \u503c\u4e0a\u7684\u884c\u4e3a\uff1f<\/h1>\n

2024-10-26 15:25:46<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u5b66\u4e60\u77e5\u8bc6\u8981\u5584\u4e8e\u601d\u8003\uff0c\u601d\u8003\uff0c\u518d\u601d\u8003\uff01\u4eca\u5929GOLANG\u5c0f\u7f16\u5c31\u7ed9\u5927\u5bb6\u5e26\u6765\u300aGOLANG \u51fd\u6570\uff1a\u7c7b\u578b\u65ad\u8a00\u5728 nil \u503c\u4e0a\u7684\u884c\u4e3a\uff1f\u300b<\/span>\uff0c\u4ee5\u4e0b\u5185\u5bb9\u4e3b\u8981\u5305\u542b<\/span>\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60\u6216\u51c6\u5907\u5b66\u4e60GOLANG<\/span>\uff0c\u5c31\u90fd\u4e0d\u8981\u9519\u8fc7\u672c\u6587\u5566~\u8ba9\u6211\u4eec\u4e00\u8d77\u6765\u770b\u770b\u5427\uff0c\u80fd\u5e2e\u52a9\u5230\u4f60\u5c31\u66f4\u597d\u4e86\uff01<\/span><\/p>\n

\u5bf9\u4e8e nil \u503c\u8fdb\u884c\u7c7b\u578b\u65ad\u8a00\u65f6\uff0cvalue \u5c06\u4e3a nil\uff0cok \u5c06\u4e3a false\uff0c\u56e0\u4e3a nil \u4e0d\u662f\u4efb\u4f55\u7c7b\u578b\u7684\u5177\u4f53\u5b9e\u4f8b\u3002<\/p>\n

<\/p>\n

GOLANG \u51fd\u6570\uff1a\u7c7b\u578b\u65ad\u8a00\u5728 nil \u503c\u4e0a\u7684\u884c\u4e3a<\/h2>\n

\u7c7b\u578b\u65ad\u8a00<\/h3>\n

\u7c7b\u578b\u65ad\u8a00\u5141\u8bb8\u6211\u4eec\u5c06\u63a5\u53e3\u503c\u8f6c\u6362\u4e3a\u7279\u5b9a\u7c7b\u578b\u7684\u5177\u4f53\u503c\u3002Go \u4e2d\u7c7b\u578b\u65ad\u8a00\u91c7\u7528\u4ee5\u4e0b\u8bed\u6cd5\uff1a<\/p>\n

value, ok := interface.(Type)<\/pre>\n
\u5176\u4e2d\uff1a<\/p>\n
    \n
  • value<\/code> \u662f\u8f6c\u6362\u540e\u7684\u5177\u4f53\u503c\u3002<\/li>\n
  • ok<\/code> \u662f\u4e00\u4e2a\u5e03\u5c14\u503c\uff0c\u8868\u793a\u8f6c\u6362\u662f\u5426\u6210\u529f\u3002<\/li>\n<\/ul>\n
    nil \u503c\u4e0a\u7684\u884c\u4e3a<\/h3>\n
    \u5f53\u6211\u4eec\u5bf9 nil \u503c\u8fdb\u884c\u7c7b\u578b\u65ad\u8a00\u65f6\uff0cvalue<\/code> \u5c06\u4e3a nil<\/strong>\uff0cok<\/code> \u5c06\u4e3a false<\/strong>\u3002\u8fd9\u662f\u56e0\u4e3a nil \u4e0d\u662f\u4efb\u4f55\u7c7b\u578b\u7684\u5177\u4f53\u5b9e\u4f8b\u3002<\/p>\n
    \u5b9e\u6218\u6848\u4f8b<\/h3>\n
    \u8003\u8651\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\n
    package main\n\nimport (\n    \"fmt\"\n)\n\ntype Person struct {\n    Name string\n}\n\nfunc main() {\n    var p *Person \/\/ p \u662f\u4e00\u4e2a\u6307\u5411 Person \u6307\u9488\u7684\u6307\u9488\n\n    \/\/ \u5bf9 nil \u6307\u9488\u8fdb\u884c\u7c7b\u578b\u65ad\u8a00\n    v, ok := p.(Person)\n    fmt.Println(v, ok) \/\/ nil false\n\n    \/\/ \u5bf9 nil \u503c\u8fdb\u884c\u7c7b\u578b\u65ad\u8a00\n    v, ok = nil.(Person)\n    fmt.Println(v, ok) \/\/ nil false\n}<\/pre>\n
    \u8f93\u51fa\uff1a<\/p>\n
    nil false\nnil false<\/pre>\n
    \u5982\u4f60\u6240\u89c1\uff0c\u5373\u4f7f\u6211\u4eec\u5bf9 nil \u6307\u9488\u548c nil \u503c\u8fdb\u884c\u7c7b\u578b\u65ad\u8a00\uff0c\u7ed3\u679c\u90fd\u662f\u4e00\u6837\u7684\uff0c\u5373 value<\/code> \u4e3a nil<\/strong>\uff0cok<\/code> \u4e3a false<\/strong>\u3002<\/p>\n
    \u4eca\u5929\u5173\u4e8e\u300aGOLANG \u51fd\u6570\uff1a\u7c7b\u578b\u65ad\u8a00\u5728 nil \u503c\u4e0a\u7684\u884c\u4e3a\uff1f\u300b\u7684\u5185\u5bb9\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\uff0c\u5982\u679c\u6709\u4ec0\u4e48\u7591\u95ee\u6216\u8005\u5efa\u8bae\uff0c\u53ef\u4ee5\u5728GOLANG\u516c\u4f17\u53f7\u4e0b\u591a\u591a\u56de\u590d\u4ea4\u6d41\uff1b\u6587\u4e2d\u82e5\u6709\u4e0d\u6b63\u4e4b\u5904\uff0c\u4e5f\u5e0c\u671b\u56de\u590d\u7559\u8a00\u4ee5\u544a\u77e5\uff01<\/p>\n
    \n
    \n <\/dt>\n
    \n   PHP \u51fd\u6570\u6839\u636e\u66f4\u65b0\u9891\u7387\u5982\u4f55\u5206\u7c7b\uff1f\n <\/dd>\n<\/dl>\n
    \n
    \n <\/dt>\n
    \n   Web \u5f00\u53d1\u573a\u666f\u4e0b Go \u6846\u67b6\u9009\u578b\u6307\u5357\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
    \u5b66\u4e60\u77e5\u8bc6\u8981\u5584\u4e8e\u601d\u8003\uff0c\u601d\u8003\uff0c\u518d\u601d\u8003...<\/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-205585","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/205585","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=205585"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/205585\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=205585"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=205585"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=205585"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}