{"id":207549,"date":"2025-07-08T13:35:17","date_gmt":"2025-07-08T05:35:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207549\/"},"modified":"2025-07-08T13:35:17","modified_gmt":"2025-07-08T05:35:17","slug":"%e5%85%b7%e6%9c%89-1-2-%e5%80%bc%e5%92%8c%e7%9f%ad%e5%8f%98%e9%87%8f%e5%a3%b0%e6%98%8e%e7%9a%84%e5%87%bd%e6%95%b0%e4%b8%ba%e5%90%8c%e4%b8%80%e5%8f%98%e9%87%8f%e5%88%86%e9%85%8d%e4%ba%86%e4%b8%a4","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207549\/","title":{"rendered":"\u5177\u6709 1\/2 \u503c\u548c\u77ed\u53d8\u91cf\u58f0\u660e\u7684\u51fd\u6570\u4e3a\u540c\u4e00\u53d8\u91cf\u5206\u914d\u4e86\u4e24\u6b21"},"content":{"rendered":"<p><b><\/b> <\/p>\n<p>\u5f53\u524d\u4f4d\u7f6e\uff1a <span>&gt;<\/span> <span>&gt;<\/span> <span>&gt;<\/span> <span>&gt;<\/span> <span>\u5177\u6709 1\/2 \u503c\u548c\u77ed\u53d8\u91cf\u58f0\u660e\u7684\u51fd\u6570\u4e3a\u540c\u4e00\u53d8\u91cf\u5206\u914d\u4e86\u4e24\u6b21<\/span><\/p>\n<p><span>\u6765\u6e90\uff1astackoverflow<\/span><br \/>\n<span>2024-04-23 15:36:33<\/span><br \/>\n<span><i><\/i>0\u6d4f\u89c8<\/span><br \/>\n<span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> <\/p>\n<p>\u672c\u7bc7\u6587\u7ae0\u7ed9\u5927\u5bb6\u5206\u4eab\u300a\u5177\u6709 1\/2 \u503c\u548c\u77ed\u53d8\u91cf\u58f0\u660e\u7684\u51fd\u6570\u4e3a\u540c\u4e00\u53d8\u91cf\u5206\u914d\u4e86\u4e24\u6b21\u300b\uff0c\u8986\u76d6\u4e86Golang\u7684\u5e38\u89c1\u57fa\u7840\u77e5\u8bc6\uff0c\u5176\u5b9e\u4e00\u4e2a\u8bed\u8a00\u7684\u5168\u90e8\u77e5\u8bc6\u70b9\u4e00\u7bc7\u6587\u7ae0\u662f\u4e0d\u53ef\u80fd\u8bf4\u5b8c\u7684\uff0c\u4f46\u5e0c\u671b\u901a\u8fc7\u8fd9\u4e9b\u95ee\u9898\uff0c\u8ba9\u8bfb\u8005\u5bf9\u81ea\u5df1\u7684\u638c\u63e1\u7a0b\u5ea6\u6709\u4e00\u5b9a\u7684\u8ba4\u8bc6(B \u6570)\uff0c\u4ece\u800c\u5f25\u8865\u81ea\u5df1\u7684\u4e0d\u8db3\uff0c\u66f4\u597d\u7684\u638c\u63e1\u5b83\u3002<\/p>\n<p> \u95ee\u9898\u5185\u5bb9<br \/>\n <\/p>\n<p>\u6211\u5bf9\u4ee5\u4e0b\u4ee3\u7801\u6709\u4e24\u4e2a\u95ee\u9898<\/p>\n<ol>\n<li><code>emptyinterface.(int)<\/code> \u53ef\u4ee5\u8fd4\u56de\u4e00\u4e2a\u6216\u4e24\u4e2a\u503c\uff0c\u5982\u4f55\u5b9a\u4e49\u51fd\u6570\u6765\u5b9e\u73b0\u8be5\u6548\u679c\uff1f<\/li>\n<li><code>ok<\/code> \u5df2\u4f7f\u7528\u77ed\u53d8\u91cf\u58f0\u660e\u58f0\u660e\u4e86\u4e24\u6b21\uff0c\u4e3a\u4ec0\u4e48\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u53ef\u4ee5\u8fd9\u6837\u505a\uff1f<\/li>\n<\/ol>\n<pre>package main\n\nimport (\n    \"fmt\"\n)\n\nfunc main() {\n    var emptyinterface interface{}\n    emptyinterface=4\n\n    i1:=emptyinterface.(int)\n    fmt.Println(i1)\n    i2,ok:=emptyinterface.(int)\/\/&lt;- how the function is defined such that it can return either 1 (i1) or 2 values (i2,ok)?\n    fmt.Println(i2,ok)\n    i3,ok:=emptyinterface.(string) \/\/&lt;--why I can reassign to ok, which has assign previously?\n    fmt.Println(i3,ok)\n}<\/pre>\n<p> <\/p>\n<h2>\u89e3\u51b3\u65b9\u6848<\/h2>\n<p> <\/p>\n<ol>\n<li>\n<p>\u8fd9\u4e0d\u662f\u4e00\u4e2a\u51fd\u6570\uff0c\u800c\u662f\u4e00\u4e2a\u8bed\u8a00\u7279\u6027\u3002\u60a8\u65e0\u6cd5\u7f16\u5199\u6267\u884c\u6b64\u64cd\u4f5c\u7684\u51fd\u6570\uff0c\u4f46\u7f16\u8bd1\u5668\u7f16\u5199\u8005\u53ef\u4ee5\u521b\u5efa\u4e00\u4e9b\u6267\u884c\u6b64\u64cd\u4f5c\u7684\u8bed\u6cd5\u3002<\/p>\n<\/li>\n<li>\n<p>\u5982\u679c <code>:=<\/code> \u5de6\u4fa7\u6ca1\u6709\u65b0\u53d8\u91cf\uff0c\u5219\u8be5 <code> \u65e0\u6548\u3002\u5982\u679c\u81f3\u5c11\u58f0\u660e\u4e86\u4e00\u4e2a\u65b0\u53d8\u91cf\uff0c\u5219\u8fd9\u662f\u5141\u8bb8\u7684\u3002&lt;\/p&gt; &lt;\/li&gt; &lt;\/ol&gt;&lt;p&gt;\u5728\u6bcf\u79cd\u60c5\u51b5\u4e0b\uff0c\u81f3\u5c11\u90fd\u4f1a\u4e0e <code>ok<\/code> \u4e00\u8d77\u521b\u5efa\u65b0\u53d8\u91cf\uff0c\u5373 <code>i2<\/code> \u548c <code>i3<\/code>\uff0c\u56e0\u6b64\u91cd\u65b0\u58f0\u660e <code>ok<\/code> \u662f\u5b8c\u5168\u53ef\u4ee5\u7684\u3002<\/code><\/p>\n<p>\u8fd9\u5728 \u4e0b\u7684\u8bed\u8a00\u89c4\u8303\uff08\u5f3a\u8c03\u6211\u7684\uff09\u4e2d\u6709\u8be6\u7ec6\u8bb0\u5f55<\/p>\n<p>\u6b64\u5916\uff0c\u8fd8\u4e0d\u6e05\u695a\u60a8\u5728\u8fd9\u91cc\u6307\u7684\u662f\u51fd\u6570\uff0c \u662f\u8be5\u8bed\u8a00\u7684\u4e00\u9879\u529f\u80fd\uff0c\u7528\u4e8e\u65ad\u8a00\u63a5\u53e3\u4e2d\u7684\u503c\u662f\u5426\u5c5e\u4e8e\u7279\u5b9a\u7c7b\u578b\u3002\u5982\u679c\u65ad\u8a00\u6210\u529f\uff0c\u5b83\u603b\u662f\u8fd4\u56de\u57fa\u7840\u503c\uff1b\u5982\u679c\u65ad\u8a00\u5931\u8d25\uff0c\u5b83\u603b\u662f\u8fd4\u56de\u5931\u8d25\u3002\u5728\u5176\u4ed6\u5730\u65b9\u6709\u610f\u4e49\u5730\u4f7f\u7528\u7c7b\u578b\u65ad\u8a00\uff08\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff09\u4e4b\u524d\uff0c\u60a8\u5e94\u8be5\u59cb\u7ec8\u68c0\u67e5\u5b83\u7684\u8fd4\u56de\u503c\u3002<\/p>\n<p>\u4eca\u5929\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff1b\u5173\u4e8eGolang\u7684\u6280\u672f\u77e5\u8bc6\u6211\u4eec\u4f1a\u4e00\u70b9\u70b9\u6df1\u5165\u4ecb\u7ecd\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u4e00\u8d77\u5b66\u4e60\u7f16\u7a0b~<\/p>\n<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>\u5f53\u524d\u4f4d\u7f6e\uff1a &gt; &gt; &#46;&#46;&#46;<\/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-207549","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207549","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=207549"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207549\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207549"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207549"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207549"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}