{"id":42765,"date":"2024-12-01T10:29:16","date_gmt":"2024-12-01T02:29:16","guid":{"rendered":"https:\/\/fwq.ai\/blog\/42765\/"},"modified":"2024-12-01T10:29:16","modified_gmt":"2024-12-01T02:29:16","slug":"go-%e7%9a%84nil%e7%b1%bb%e5%9e%8b%e7%9a%84%e5%b9%95%e5%90%8e%e5%8f%91%e7%94%9f%e4%ba%86%e4%bb%80%e4%b9%88%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/42765\/","title":{"rendered":"Go \u7684\u201cnil\u201d\u7c7b\u578b\u7684\u5e55\u540e\u53d1\u751f\u4e86\u4ec0\u4e48\uff1f"},"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>Go \u7684\u201cnil\u201d\u7c7b\u578b\u7684\u5e55\u540e\u53d1\u751f\u4e86\u4ec0\u4e48\uff1f<\/span><\/p>\n<h1>Go \u7684\u201cnil\u201d\u7c7b\u578b\u7684\u5e55\u540e\u53d1\u751f\u4e86\u4ec0\u4e48\uff1f<\/h1>\n<p><span>\u6765\u6e90\uff1astackoverflow<\/span><br \/>\n<span>2024-04-25 21:45:35<\/span><br \/>\n<span><i><\/i>0\u6d4f\u89c8<\/span><br \/>\n<span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> <\/p>\n<p><span style=\"color: #222222;, sans-serif;background-color: #FFFFFF\">\u5404\u4f4d\u5c0f\u4f19\u4f34\u4eec\uff0c\u5927\u5bb6\u597d\u5440\uff01\u770b\u770b\u4eca\u5929\u6211\u53c8\u7ed9\u5404\u4f4d\u5e26\u6765\u4e86\u4ec0\u4e48\u6587\u7ae0\uff1f\u672c\u6587\u6807\u9898<span style=\"color: #222222;, sans-serif;background-color: #FFFFFF\">\u662f<\/span><span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aGo \u7684\u201cnil\u201d\u7c7b\u578b\u7684\u5e55\u540e\u53d1\u751f\u4e86\u4ec0\u4e48\uff1f\u300b<\/span>\uff0c\u5f88\u660e\u663e\u662f\u5173\u4e8e<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">Golang<\/span>\u7684\u6587\u7ae0\u54c8\u54c8\u54c8\uff0c\u5176\u4e2d\u5185\u5bb9\u4e3b\u8981\u4f1a\u6d89\u53ca\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\uff0c\u5982\u679c\u80fd\u5e2e\u5230\u4f60\uff0c\u89c9\u5f97\u5f88\u4e0d\u9519\u7684\u8bdd\uff0c\u6b22\u8fce\u5404\u4f4d\u591a\u591a\u70b9\u8bc4\u548c\u5206\u4eab\uff01<\/span><\/p>\n<p> \u95ee\u9898\u5185\u5bb9<br \/>\n <\/p>\n<p>\u6211\u6700\u8fd1\u5728\u4e00\u4e2a\u6d41\u884c\u7684\u7f16\u7a0b\u8bba\u575b\u4e0a\u8bfb\u5230\uff0cgo \u652f\u6301\u4e00\u4e9b\u201c\u65e0\u7c7b\u578b\u201d\u503c &#8211; \u7279\u522b\u662f <code>nil<\/code>\uff0cgo \u7684\u7a7a\u503c\/\u5e95\u90e8\u7c7b\u578b\u3002\u6211\u5bf9 go \u7684\u7ecf\u9a8c\u76f8\u5f53\u6709\u9650\uff0c\u8fd9\u4e2a\u8bba\u575b\u4e0a\u7684\u4e00\u4e2a\u8bf4\u6cd5\u8ba9\u6211\u63aa\u624b\u4e0d\u53ca\u2014\u2014\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728 go \u4e2d\u7f16\u5199 <code>x := nil<\/code> \u662f\u975e\u6cd5\u7684\u3002<\/p>\n<p>\u679c\u7136\uff0c\u5e26\u6709\u8be5\u884c\u7684\u73a9\u5177go\u7a0b\u5e8f\u65e0\u6cd5\u7f16\u8bd1\uff0c\u5e76\u4e14\u7f16\u8bd1\u5668\u9519\u8bef\u6e05\u695a\u5730\u6307\u51fa\u8bba\u575b\u4e2d\u7684\u8bc4\u8bba\u68c0\u67e5\u51fa\uff1a\u4e0d\u5141\u8bb8\u5c06\u53d8\u91cf\u58f0\u660e\u548c\u5206\u914d\u7ed9<code>nil<\/code>\u3002\u8fd9\u770b\u8d77\u6765\u6709\u70b9\u5947\u602a\uff0c\u4f46\u4e8b\u60c5\u53d8\u5f97\u66f4\u5947\u602a\u3002<\/p>\n<p>\u901a\u8fc7\u4ece\u51fd\u6570\u8fd4\u56de\u5143\u7ec4\u6765\u8fd4\u56de\u90e8\u5206\u9519\u8bef\u662f go \u4e2d\u7684\u5e38\u89c1\u4e60\u60ef\u7528\u6cd5\u3002\u50cf\u8fd9\u6837\u7684\u4e8b\u60c5\uff1a<\/p>\n<pre>func might_error() (int, error) {\n    return 1, nil\n}\n\nfunc main() int {\n    x, err := might_error()\n    if err != nil {\n        panic(\"err was not nil!\")\n    }\n\n    return x\n}\n<\/pre>\n<p>\u636e\u6211\u6240\u77e5\uff0c\u8fd9\u81f3\u5c11\u6709\u4e24\u4e2a\u4e0d\u4e00\u81f4\u4e4b\u5904\uff1a<\/p>\n<ul>\n<li>\n<p>\u9996\u5148\uff0c\u5c3d\u7ba1 <code>nil<\/code> \u5728\u7eb8\u9762\u4e0a\u662f\u65e0\u7c7b\u578b\u7684\uff0c\u4f46\u5b83\u91c7\u7528 <code>error<\/code> \u7c7b\u578b\uff08\u901a\u8fc7\u5b9e\u73b0 <code>error<\/code> \u63a5\u53e3\u5e76\u7ed3\u5408 go \u7684\u9e2d\u5b50\u7c7b\u578b\uff09\uff0c\u4ee5\u7b26\u5408 <code>might_error<\/code> \u7684\u8fd4\u56de\u7c7b\u578b\u7b7e\u540d\u3002 p&gt; <\/p>\n<\/li>\n<li>\n<p>\u5176\u6b21\uff0c<code>nil<\/code> \u4f3c\u4e4e\u88ab\u7528\u4e8e <code>main<\/code> \u4e2d\u4ee5\u524d\u975e\u6cd5\u7684\u58f0\u660e\u548c\u8d4b\u503c\uff0c\u5e76\u4e14\u5728\uff08\u81f3\u5c11\u5728\u7c7b\u4f3c\u8bed\u8a00\u4e2d\uff09<code>might_error<\/code> \u53ef\u4ee5\u88ab\u89c6\u4e3a constexpr \u7684\u60c5\u51b5\u4e0b\u3002 p&gt; <\/p>\n<ul>\n<li>\u8fd8\u662f\u5f88\u5947\u602a\uff0c\u7528 <code>x, err := 1, nil<\/code> \u66ff\u6362 <code>x, err := might_error()<\/code> <em>\u4f7f\u7528\u975e\u7c7b\u578b\u5316 nil \u7684 <code>use \u4ecd\u7136\u4f1a\u51fa\u9519\uff01&lt;\/em&gt;&lt;\/li&gt; &lt;\/ul&gt; &lt;\/li&gt; &lt;\/ul&gt; &lt;p&gt;\u6211\u76ee\u524d\u7684\u601d\u8def\u662f\uff0c\u5728\u51fd\u6570\u7684\u7c7b\u578b\u7b7e\u540d\u9700\u8981 <code>error<\/code> \u63a5\u53e3\u7684\u60c5\u51b5\u4e0b\uff0c\u5c06 <code>error<\/code> \u63a5\u53e3\u6ce8\u5165\u5230 <code>nil<\/code> \u7684\u7279\u5b9a\u5b9e\u4f8b\u4e2d\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u4e0d\u518d\u662f\u4e00\u4e2a<em>\u65e0\u7c7b\u578b<\/em> <code>nil<\/code> \u5e76\u6210\u4e3a <em> em&gt;\u5728\u8be5\u7279\u5b9a <code>nil<\/code> \u5b9e\u4f8b\u7684\u751f\u547d\u5468\u671f\u4e2d\u952e\u5165 <code>nil<\/code> \uff0c\u4f46\u6211\u5b8c\u5168\u4e0d\u786e\u5b9a\u8fd9\u662f\u6b63\u786e\u7684\uff0c\u56e0\u4e3a\u5b83\u672c\u8d28\u4e0a\u4f3c\u4e4e\u662f\u4e00\u4e2a\u5947\u602a\u7684\u8bbe\u8ba1\u9009\u62e9\uff0c\u56e0\u4e3a\u5b83\u4e0d\u80fd\u660e\u786e\u6982\u62ec\u3002\n<p>\u662f\u4ec0\u4e48\u4fc3\u4f7f\u8fd9\u4e9b\u8bbe\u8ba1\u9009\u62e9\uff1f\u4e3a\u4ec0\u4e48 <code>nil<\/code> \u662f\u975e\u7c7b\u578b\u5316\u7684\uff0c\u800c\u4e0d\u662f\u8ba9\u5b83\u6210\u4e3a\u4e00\u4e2a\u6b63\u786e\u7684 null \u7c7b\u578b\uff0c\u9664\u975e\u5b83\u5f88\u65b9\u4fbf\uff0c\u6b64\u65f6\u5b83\u6210\u4e3a\u5b9e\u73b0 <code>error<\/code> \u63a5\u53e3\u7684\u7c7b\u578b\u5316\u503c\uff08\u636e\u6211\u6240\u77e5\uff09\uff1f<\/p>\n<p><\/p>\n<h2>\u6b63\u786e\u7b54\u6848<\/h2>\n<p><\/p>\n<p>\u8fd9\u5b8c\u5168\u4e0d\u662f\u95ee\u9898\uff0c\u56e0\u4e3a\u5728\u5b9e\u8df5\u4e2d\uff0c\u5982\u679c\u5c06 nil \u503c\u5b58\u50a8\u5728\u63a5\u53e3\u53d8\u91cf\u4e2d\uff0c\u4ece\u800c\u4f7f\u8be5\u53d8\u91cf\u975e nil\uff0c\u5219\u53ef\u80fd\u4f1a\u9020\u6210\u6df7\u4e71\u3002\u8fd9\u662f \uff0c\u6bcf\u4e2a\u4eba\u90fd\u88ab\u8fd9\u4e2a\u95ee\u9898\u56f0\u6270\u8fc7\u51e0\u6b21\uff0c\u76f4\u5230\u4f60\u4e86\u89e3\u5230\u5305\u542b nil \u53d8\u91cf\u7684\u63a5\u53e3\u503c\u672c\u8eab\u4e0d\u518d\u662f nil\u3002\u8fd9\u6709\u70b9\u50cf <code>var s = []*int{nil, nil, nil}<\/code>\uff0c\u5176\u4e2d <code>s<\/code> \u4ec5\u5305\u542b nils\uff0c\u4f46\u672c\u8eab\u4e0d\u4e3a nil\u3002<\/p>\n<p>\u4ece\u6280\u672f\u4e0a\u6765\u8bf4\uff08\u4ece\u8bed\u8a00\u8bbe\u8ba1\u7684\u89d2\u5ea6\u6765\u770b\uff09\u4f60\u53ef\u4ee5\u5f15\u5165\u51e0\u4e2a\u201cnils\u201d\uff0c\u4f8b\u5982<code>nil<\/code> \u7528\u4e8e\u6307\u9488\uff0c<code>null<\/code> \u7528\u4e8e\u63a5\u53e3\uff0c<code>noop<\/code> \u7528\u4e8e\u51fd\u6570\uff0c<code>vac<\/code> \u7528\u4e8e\u901a\u9053\u3002 \uff08\u6709\u70b9\u5938\u5f20\uff09\u3002\u6709\u4e86\u8fd9\u4e2a\u4f60\u5c31\u53ef\u4ee5\uff1a<\/p>\n<pre>type t whatever\nfunc (t *t) error() string \/\/ make *t implement error\nvar err error              \/\/ interface variable of type error\nprint(err == null)         \/\/ true, null is zero-value of interface types\nprint(err == nil)          \/\/ compiler error, cannot compare interface to nil (which is for pointers only\nvar t *t = nil             \/\/ a nil pointer to t\nerr = t                    \/\/ store nil *t in err\nprint(err == null)         \/\/ false err is no longer null, contains t<\/pre>\n<p>\u60a8\u751a\u81f3\u53ef\u4ee5\u5220\u9664\u7f16\u8bd1\u5668\u9519\u8bef\uff1a<\/p>\n<pre>err = t                    \/\/ store nil *t in err\nprint(err == null)         \/\/ false, err contains t\nprint(err == nil)          \/\/ \"deep\" comparison yielding true\nerr = &amp;t{}                 \/\/ store non-nil *t in err\nprint(err == null)         \/\/ still false\nprint(err == nil)          \/\/ false, value inside err is no longer nil<\/pre>\n<p>\u60a8\u8fd8\u53ef\u4ee5\u4e3a nil \u5b9a\u4e49\u9ed8\u8ba4\u7c7b\u578b\uff0c\u4f8b\u5982<code>*[]chan*func()string<\/code> \u8fd9\u6837\u60a8\u5c31\u53ef\u4ee5\u50cf <code>f := 3.141<\/code> \u4e00\u6837\u7f16\u5199 <code>x := nil<\/code> \uff0c\u5176\u4e2d\u65e0\u7c7b\u578b\u5e38\u91cf 3.141 \u7684\u9ed8\u8ba4\u7c7b\u578b\u662f float64\u3002\u4f46\u662f nil \u7684\u8fd9\u79cd\u9ed8\u8ba4\u7c7b\u578b\u662f\u4efb\u610f\u7684\uff0c\u6839\u672c\u6ca1\u6709\u5e2e\u52a9\uff08\u5982\u6211\u7684\u793a\u4f8b\u6240\u793a\uff1b<code>*[]chan*func()string<\/code> \u5e76\u4e0d\u5e38\u89c1\uff09\u3002<\/p>\n<p>\u5982\u679c\u6211\u6ca1\u8bb0\u9519\u7684\u8bdd\uff0cgolang-nuts \u90ae\u4ef6\u5217\u8868\u4e0a\u6709\u4e00\u4e2a\u5173\u4e8e\u8fd9\u4e2a\u4e3b\u9898\u7684\u66f4\u957f\u7684\u8ba8\u8bba\uff0c\u5176\u4e2d\u8ba8\u8bba\u4e86\u8fd9\u4e2a\u8bbe\u8ba1\u7684\u539f\u7406\u3002\u5b83\u53ef\u4ee5\u5f52\u7ed3\u4e3a\u8fd9\u6837\u7684\u5185\u5bb9\uff1a\u201c<code>nil<\/code> \u5177\u6709\u591a\u79cd\u542b\u4e49\u5e76\u4e14\u4e0d\u662f\u5e38\u91cf\u7684\u5b9e\u9645\u95ee\u9898\u5f88\u5c0f\uff08\u57fa\u672c\u4e0a\u53ea\u662f\u5305\u542b nil \u7684\u9519\u8bef\u7c7b\u578b\u7684\u53d8\u4f53\u800c\u4e0d\u662f nil\uff09\u3002\u8fd9\u4e2a\u5c0f\u95ee\u9898\u7684\u2018\u89e3\u51b3\u65b9\u6848\u2019\u4f1a\u4f7f\u8bed\u8a00\u53d8\u5f97\u76f8\u5f53\u590d\u6742\uff08\u4f8b\u5982\uff0c\u901a\u8fc7\u4e3a\u63a5\u53e3\u7c7b\u578b\u7684\u96f6\u503c\u5f15\u5165 <code>null<\/code> \u6587\u5b57\uff09\u3002\u6559\u5bfc\u4eba\u4eec\u5305\u542b nil \u7684\u63a5\u53e3\u503c\u672c\u8eab\u4e0d\u518d\u662f nil \u53ef\u80fd\u6bd4\u4e3a\u63a5\u53e3\u7c7b\u578b\u5f15\u5165\u7c7b\u578b\u5316 nils \u6216 null \u66f4\u7b80\u5355\u3002 <\/p>\n<p>\u5728 10 \u591a\u5e74\u7684 go \u7f16\u7a0b\u751f\u6daf\u4e2d\uff0c\u6211\u5b9e\u9645\u4e0a\u4ece\u672a\u8003\u8651\u8fc7 <code>nil<\/code> \u6587\u5b57\u662f\u7c7b\u578b\u5316\u7684\u3001\u975e\u7c7b\u578b\u5316\u7684\u3001\u5e38\u91cf\u8fd8\u662f\u5176\u4ed6\u4ec0\u4e48\u3002\u60a8\u53ef\u80fd\u63d0\u5230\u7684\u8fd9\u7bc7\u6587\u7ae0\u6b63\u5728\u6784\u5efa\u7eaf\u7cb9\u7684\u5b66\u672f\u95ee\u9898\uff0c\u4f46\u5b9e\u9645\u4e0a\u5728\u5b9e\u8df5\u4e2d\u6ca1\u6709\u95ee\u9898\uff0c\u8fd9\u662f\u51fa\u4e8e\u4e00\u4e2a\u5fae\u5c0f\u7684\u8bbe\u8ba1\u51b3\u7b56\uff0c\u5373\u53ea\u6709\u4e00\u4e2a <code>nil<\/code> \u6587\u5b57\u6765\u8868\u793a\u6307\u9488\u3001\u5207\u7247\u3001\u6620\u5c04\u3001\u901a\u9053\u548c\u51fd\u6570\u7c7b\u578b\u7684\u6240\u6709\u96f6\u503c\u3002 p&gt; <\/p>\n<p>\u9644\u5f55<\/p>\n<p>\u8fd9\u662f\u5bf9\u6240\u53d1\u751f\u60c5\u51b5\u7684\u5b8c\u5168\u9519\u8bef\u7684\u63cf\u8ff0\u3002<\/p>\n<p>\u5982\u679c\u4f60\u5199<\/p>\n<pre>func f() (r int) { return 7 }<\/pre>\n<p>\u7136\u540e 7 \u88ab\u5206\u914d\u7ed9 int \u7c7b\u578b\u7684 r \u5e76\u4e14 f \u8fd4\u56de\u3002\u8fd9\u662f\u53ef\u884c\u7684\uff0c\u56e0\u4e3a 7 \u53ef\u4ee5\u5206\u914d\u7ed9 int\u3002<\/p>\n<p>\u5728<\/p>\n<pre>func might_error() (int, error) { return 1, nil }<\/pre>\n<p>\u540c\u6837\u7684\u60c5\u51b5\u4e5f\u4f1a\u53d1\u751f\uff0c\u7c7b\u578b error\uff08\u63a5\u53e3\u7c7b\u578b\uff09\u7684\u7b2c\u4e8c\u4e2a\u8fd4\u56de\u53d8\u91cf\u88ab\u8bbe\u7f6e\u4e3a nil\uff0c\u56e0\u4e3a nil \u53ef\u4ee5\u5206\u914d\u7ed9\u4efb\u4f55\u63a5\u53e3\u7c7b\u578b\uff0c\u5c31\u50cf\u4f60\u53ef\u4ee5\u5c06 nil \u5206\u914d\u7ed9\u4efb\u4f55\u6307\u9488\u7c7b\u578b\u6216\u4efb\u4f55\u51fd\u6570\u7c7b\u578b\u4e00\u6837\u3002<\/p>\n<p>\u8fd9\u4e0e\u201c\u7ed3\u5408 go \u7684\u9e2d\u5b50\u7c7b\u578b\u5b9e\u73b0 error \u63a5\u53e3\u201d\u6ca1\u6709\u4efb\u4f55\u5173\u7cfb\u3002\u7edd\u5bf9\u4e0d\u3002 nil \u6839\u672c\u4e0d\u5b9e\u73b0\u9519\u8bef\u63a5\u53e3\u3002\u4efb\u4f55\u63a5\u53e3\u503c\u90fd\u53ef\u4ee5\u4e3a nil\uff0c\u5c31\u50cf\u4efb\u4f55\u51fd\u6570\u503c\u3001\u5207\u7247\u503c\u6216\u901a\u9053\u503c\u4e00\u6837\u3002\u5c06 chan \u8bbe\u7f6e\u4e3a nil \u57fa\u672c\u4e0a\u4f1a\u201c\u6e05\u9664\u201d\u901a\u9053\u53d8\u91cf\uff0c\u5e76\u4e0d\u610f\u5473\u7740 nil \u4ee5\u67d0\u79cd\u65b9\u5f0f\u201c\u5b9e\u73b0\u901a\u9053\u63a5\u53e3\u201d\u3002\u60a8\u4f3c\u4e4e\u5c06\u51e0\u79cd\u7c7b\u578b\u7684\u96f6\u503c\u4ee5\u53ca\u5982\u4f55\u901a\u8fc7\u5206\u914d nil \u4e0e\u5b9e\u73b0\u63a5\u53e3\u6765\u8bbe\u7f6e\u5b83\u4eec\u6df7\u4e3a\u4e00\u8c08\u3002\u6240\u6709\u8fd9\u4e9b\u57fa\u672c\u4e0a\u4e0e\u662f\u5426\u8f93\u5165 nil \u65e0\u5173\u3002\u6e90\u4ee3\u7801\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u7684 <code>nil<\/code> \u6587\u5b57\u5df2\u91cd\u8f7d\uff0c\u901a\u5e38\u53ef\u4ee5\u88ab\u8ba4\u4e3a\u4ec5\u8868\u793a\u7c7b\u578b\u7684\u96f6\u503c\u3002<\/p>\n<p>\u4eca\u5929\u5173\u4e8e\u300aGo \u7684\u201cnil\u201d\u7c7b\u578b\u7684\u5e55\u540e\u53d1\u751f\u4e86\u4ec0\u4e48\uff1f\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\uff01<\/p>\n<p><\/em><\/code><\/em><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u5f53\u524d\u4f4d\u7f6e\uff1a &gt; &gt; &gt; &gt; Go \u7684\u201cnil\u201d\u7c7b\u578b\u7684\u5e55\u540e\u53d1\u751f\u4e86\u4ec0\u4e48\uff1f Go \u7684\u201cnil\u201d\u7c7b\u578b\u7684\u5e55\u540e\u53d1\u751f\u4e86\u4ec0\u4e48\uff1f \u6765\u6e90\uff1astackoverflow 2024-04-25 21:45:35 0\u6d4f\u89c8 \u6536\u85cf \u5404\u4f4d\u5c0f\u4f19\u4f34\u4eec\uff0c\u5927\u5bb6\u597d\u5440\uff01\u770b\u770b\u4eca\u5929\u6211\u53c8\u7ed9\u5404\u4f4d\u5e26\u6765\u4e86\u4ec0\u4e48\u6587\u7ae0\uff1f\u672c\u6587\u6807\u9898\u662f\u300aGo \u7684\u201cnil\u201d\u7c7b\u578b\u7684\u5e55\u540e\u53d1\u751f\u4e86\u4ec0\u4e48\uff1f\u300b\uff0c\u5f88\u660e\u663e\u662f\u5173\u4e8eGolang\u7684\u6587\u7ae0\u54c8\u54c8\u54c8\uff0c\u5176\u4e2d\u5185\u5bb9\u4e3b\u8981\u4f1a\u6d89\u53ca\u5230\u7b49\u7b49\uff0c\u5982\u679c\u80fd\u5e2e\u5230\u4f60\uff0c\u89c9\u5f97\u5f88\u4e0d\u9519\u7684\u8bdd\uff0c\u6b22\u8fce\u5404\u4f4d\u591a\u591a\u70b9\u8bc4\u548c\u5206\u4eab\uff01 \u95ee\u9898\u5185\u5bb9 \u6211\u6700\u8fd1\u5728\u4e00\u4e2a\u6d41\u884c\u7684\u7f16\u7a0b\u8bba\u575b\u4e0a\u8bfb\u5230\uff0cgo \u652f\u6301\u4e00\u4e9b\u201c\u65e0\u7c7b\u578b\u201d\u503c &#8211; \u7279\u522b\u662f nil\uff0cgo \u7684\u7a7a\u503c\/\u5e95\u90e8\u7c7b\u578b\u3002\u6211\u5bf9 go \u7684\u7ecf\u9a8c\u76f8\u5f53\u6709\u9650\uff0c\u8fd9\u4e2a\u8bba\u575b\u4e0a\u7684\u4e00\u4e2a\u8bf4\u6cd5\u8ba9\u6211\u63aa\u624b\u4e0d\u53ca\u2014\u2014\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728 go \u4e2d\u7f16\u5199 x := nil \u662f\u975e\u6cd5\u7684\u3002 \u679c\u7136\uff0c\u5e26\u6709\u8be5\u884c\u7684\u73a9\u5177go\u7a0b\u5e8f\u65e0\u6cd5\u7f16\u8bd1\uff0c\u5e76\u4e14\u7f16\u8bd1\u5668\u9519\u8bef\u6e05\u695a\u5730\u6307\u51fa\u8bba\u575b\u4e2d\u7684\u8bc4\u8bba\u68c0\u67e5\u51fa\uff1a\u4e0d\u5141\u8bb8\u5c06\u53d8\u91cf\u58f0\u660e\u548c\u5206\u914d\u7ed9nil\u3002\u8fd9\u770b\u8d77\u6765\u6709\u70b9\u5947\u602a\uff0c\u4f46\u4e8b\u60c5\u53d8\u5f97\u66f4\u5947\u602a\u3002 \u901a\u8fc7\u4ece\u51fd\u6570\u8fd4\u56de\u5143\u7ec4\u6765\u8fd4\u56de\u90e8\u5206\u9519\u8bef\u662f go \u4e2d\u7684\u5e38\u89c1\u4e60\u60ef\u7528\u6cd5\u3002\u50cf\u8fd9\u6837\u7684\u4e8b\u60c5\uff1a func might_error() (int, error) { return 1, nil } func main() int { x, err := might_error() if err != [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[],"class_list":["post-42765","post","type-post","status-publish","format-standard","hentry","category-docker"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/42765","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=42765"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/42765\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=42765"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=42765"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=42765"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}