{"id":67463,"date":"2026-01-28T20:24:44","date_gmt":"2026-01-28T12:24:44","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/67463.html"},"modified":"2026-01-28T20:24:44","modified_gmt":"2026-01-28T12:24:44","slug":"22%e3%80%81%e5%90%83%e9%80%8fgo%e8%af%ad%e8%a8%80%e5%bc%82%e5%b8%b8%e5%a4%84%e7%90%86%ef%bc%81panic-recover-defer%e6%a0%b8%e5%bf%83%e7%94%a8%e6%b3%95%e9%81%bf%e5%9d%91%e6%8c%87%e5%8d%97%ef%bc%8c","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/67463.html","title":{"rendered":"22\u3001\u5403\u900fGo\u8bed\u8a00\u5f02\u5e38\u5904\u7406\uff01panic\/recover\/defer\u6838\u5fc3\u7528\u6cd5+\u907f\u5751\u6307\u5357\uff0c\u9762\u8bd5\u7a33\u4e86"},"content":{"rendered":"<hr \/>\n<p>\u70b9\u51fb\u6295\u7968\u4e3a\u6211\u76842025\u535a\u5ba2\u4e4b\u661f\u8bc4\u9009\u52a9\u529b&#xff01;<\/p>\n<hr \/>\n<h2>\u5403\u900fGo\u8bed\u8a00\u5f02\u5e38\u5904\u7406&#xff01;panic\/recover\/defer\u6838\u5fc3\u7528\u6cd5&#043;\u907f\u5751\u6307\u5357&#xff0c;\u9762\u8bd5\u7a33\u4e86<\/h2>\n<p>\u5728Java\u3001C&#043;&#043;\u7b49\u8bed\u8a00\u4e2d&#xff0c;\u5f02\u5e38\u5904\u7406\u9760try-catch-finally\u4e09\u677f\u65a7&#xff0c;\u4f46Go\u8bed\u8a00\u504f\u504f\u4e0d\u8d70\u5bfb\u5e38\u8def\u2014\u2014\u7528panic\u3001recover\u3001defer\u7684\u7ec4\u5408\u5b9e\u73b0\u5f02\u5e38\u5904\u7406\u903b\u8f91\u3002<\/p>\n<p>\u8fd9\u4e09\u4e2a\u5173\u952e\u5b57\u4e0d\u4ec5\u662fGo\u5f00\u53d1\u7684\u6838\u5fc3\u77e5\u8bc6\u70b9&#xff0c;\u66f4\u662f\u9762\u8bd5\u4e2d\u9762\u8bd5\u5b98\u201c\u8ffd\u7740\u95ee\u201d\u7684\u9ad8\u9891\u8003\u70b9&#xff0c;\u7a0d\u4e0d\u6ce8\u610f\u5c31\u5bb9\u6613\u8e29\u5751\u3002<\/p>\n<p>\u4eca\u5929\u5c31\u5e26\u5927\u5bb6\u5f7b\u5e95\u641e\u61c2\u8fd9\u4e09\u8005\u7684\u6838\u5fc3\u7528\u6cd5\u3001\u907f\u5751\u6280\u5de7&#xff0c;\u4ee5\u53caGo\u8bed\u8a00\u5f02\u5e38\u5904\u7406\u7684\u8bbe\u8ba1\u903b\u8f91\u3002<\/p>\n<h3>\u4e00\u3001panic&#xff1a;\u5982\u4f55\u8ba9\u201c\u8fd0\u884c\u65f6\u6050\u614c\u201d\u5e26\u6709\u7528\u7684\u4fe1\u606f&#xff1f;<\/h3>\n<p>panic&#xff08;\u8fd0\u884c\u65f6\u6050\u614c&#xff09;\u662fGo\u8bed\u8a00\u4e2d\u7a0b\u5e8f\u5f02\u5e38\u7ec8\u6b62\u7684\u4fe1\u53f7&#xff0c;\u65e0\u8bba\u662f\u6570\u7ec4\u8d8a\u754c\u3001\u7a7a\u6307\u9488\u5f15\u7528\u8fd9\u7c7b\u65e0\u610f\u89e6\u53d1\u7684panic&#xff0c;\u8fd8\u662f\u4e3b\u52a8\u8c03\u7528panic()\u51fd\u6570\u5f15\u53d1\u7684panic&#xff0c;\u90fd\u4f1a\u5bfc\u81f4\u7a0b\u5e8f\u9ed8\u8ba4\u5d29\u6e83\u3002\u800c\u4e3b\u52a8\u89e6\u53d1panic\u65f6&#xff0c;\u6211\u4eec\u53ef\u4ee5\u8ba9\u5b83\u643a\u5e26\u81ea\u5b9a\u4e49\u4fe1\u606f\u2014\u2014\u8fd9\u4e5f\u662f\u9762\u8bd5\u4e2d\u6700\u5e38\u95ee\u7684\u7b2c\u4e00\u4e2a\u95ee\u9898&#xff1a;\u600e\u4e48\u8ba9panic\u5305\u542b\u6709\u610f\u4e49\u7684\u503c&#xff1f;<\/p>\n<h4>1. \u7ed9panic\u4f20\u503c\u7684\u57fa\u672c\u65b9\u5f0f<\/h4>\n<p>panic\u51fd\u6570\u7684\u53c2\u6570\u7c7b\u578b\u662finterface{}&#xff0c;\u8bed\u6cd5\u4e0a\u53ef\u4ee5\u4f20\u5165\u4efb\u610f\u7c7b\u578b\u7684\u503c&#xff1a;<\/p>\n<p><span class=\"token keyword\">package<\/span> main<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token string\">&#034;errors&#034;<\/span><\/p>\n<p><span class=\"token keyword\">func<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u4f20\u5165error\u7c7b\u578b&#xff08;\u63a8\u8350&#xff09;<\/span><br \/>\n    <span class=\"token function\">panic<\/span><span class=\"token punctuation\">(<\/span>errors<span class=\"token punctuation\">.<\/span><span class=\"token function\">New<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6570\u636e\u5e93\u8fde\u63a5\u5931\u8d25&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u4e5f\u53ef\u4ee5\u4f20\u5165\u5b57\u7b26\u4e32&#xff08;\u4e0d\u63a8\u8350&#xff09;<\/span><br \/>\n    <span class=\"token comment\">\/\/ panic(&#034;\u6570\u636e\u5e93\u8fde\u63a5\u5931\u8d25&#034;)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>2. \u8be5\u7ed9panic\u4f20\u4ec0\u4e48\u503c&#xff1f;<\/h4>\n<p>\u867d\u7136panic\u652f\u6301\u4efb\u610f\u7c7b\u578b\u53c2\u6570&#xff0c;\u4f46\u4f18\u5148\u4f20error\u7c7b\u578b\u503c&#xff0c;\u6216\u53ef\u88ab\u6709\u6548\u5e8f\u5217\u5316\u7684\u503c&#xff08;\u5982\u5b9e\u73b0\u4e86String()\u65b9\u6cd5\u7684\u81ea\u5b9a\u4e49\u7c7b\u578b&#xff09;\u3002\u539f\u56e0\u5f88\u7b80\u5355&#xff1a;<\/p>\n<ul>\n<li>\u7a0b\u5e8f\u5d29\u6e83\u65f6&#xff0c;panic\u643a\u5e26\u7684\u503c\u4f1a\u88ab\u76f4\u63a5\u6253\u5370&#xff1b;\u82e5\u901a\u8fc7recover\u6062\u590dpanic&#xff0c;\u8fd9\u4e2a\u503c\u4e5f\u4f1a\u88ab\u53d6\u51fa\u5e76\u5199\u5165\u65e5\u5fd7\u3002<\/li>\n<li>error\u7c7b\u578b\u81ea\u5e26Error()\u65b9\u6cd5&#xff0c;fmt\u5305\u7684\u6253\u5370\u51fd\u6570&#xff08;\u5982fmt.Printf&#xff09;\u4f1a\u901a\u8fc7\u8be5\u65b9\u6cd5\u8f93\u51fa\u7ed3\u6784\u5316\u7684\u9519\u8bef\u4fe1\u606f&#xff0c;\u6bd4\u76f4\u63a5\u4f20\u5b57\u7b26\u4e32\u66f4\u6613\u6269\u5c55\u3001\u66f4\u6613\u6392\u67e5\u95ee\u9898\u3002<\/li>\n<\/ul>\n<p>\u793a\u4f8b&#xff1a;\u7ed9\u81ea\u5b9a\u4e49\u7c7b\u578b\u5b9e\u73b0String()\u65b9\u6cd5&#xff0c;\u8ba9panic\u4fe1\u606f\u66f4\u6613\u8bfb&#xff1a;<\/p>\n<p><span class=\"token keyword\">package<\/span> main<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token string\">&#034;fmt&#034;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u81ea\u5b9a\u4e49\u9519\u8bef\u7c7b\u578b<\/span><br \/>\n<span class=\"token keyword\">type<\/span> DBError <span class=\"token keyword\">struct<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    Code <span class=\"token builtin\">int<\/span><br \/>\n    Msg  <span class=\"token builtin\">string<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5b9e\u73b0String()\u65b9\u6cd5&#xff0c;\u8ba9\u503c\u53ef\u88ab\u53cb\u597d\u5e8f\u5217\u5316<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token punctuation\">(<\/span>e DBError<span class=\"token punctuation\">)<\/span> <span class=\"token function\">String<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token builtin\">string<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Sprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6570\u636e\u5e93\u9519\u8bef[\u7801:%d]: %s&#034;<\/span><span class=\"token punctuation\">,<\/span> e<span class=\"token punctuation\">.<\/span>Code<span class=\"token punctuation\">,<\/span> e<span class=\"token punctuation\">.<\/span>Msg<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">func<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    err <span class=\"token operator\">:&#061;<\/span> DBError<span class=\"token punctuation\">{<\/span>Code<span class=\"token punctuation\">:<\/span> <span class=\"token number\">1001<\/span><span class=\"token punctuation\">,<\/span> Msg<span class=\"token punctuation\">:<\/span> <span class=\"token string\">&#034;\u8fde\u63a5\u8d85\u65f6&#034;<\/span><span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token function\">panic<\/span><span class=\"token punctuation\">(<\/span>err<span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ panic\u4fe1\u606f\u4f1a\u6253\u5370&#xff1a;\u6570\u636e\u5e93\u9519\u8bef[\u7801:1001]: \u8fde\u63a5\u8d85\u65f6<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u4e8c\u3001recover&#xff1a;\u5982\u4f55\u201c\u6551\u56de\u201d\u5d29\u6e83\u7684\u7a0b\u5e8f&#xff1f;<\/h3>\n<p>panic\u4e00\u65e6\u89e6\u53d1&#xff0c;\u7a0b\u5e8f\u4f1a\u6cbf\u7740\u8c03\u7528\u6808\u53cd\u5411\u4f20\u64ad\u5e76\u7ec8\u6b62&#xff0c;\u800crecover\u662fGo\u8bed\u8a00\u552f\u4e00\u80fd\u6062\u590dpanic\u7684\u5185\u5efa\u51fd\u6570\u2014\u2014\u4f46\u5b83\u7684\u7528\u6cd5\u6709\u4e25\u683c\u8981\u6c42&#xff0c;\u7528\u9519\u4e86\u5b8c\u5168\u65e0\u6548\u3002\u9762\u8bd5\u4e2d\u7b2c\u4e8c\u4e2a\u9ad8\u9891\u95ee\u9898&#xff1a;\u600e\u6837\u6b63\u786e\u4f7f\u7528recover\u907f\u514d\u7a0b\u5e8f\u5d29\u6e83&#xff1f;<\/p>\n<h4>1. \u4e24\u4e2a\u5178\u578b\u7684\u9519\u8bef\u7528\u6cd5<\/h4>\n<p>\u5148\u770b\u53cd\u9762\u4f8b\u5b50&#xff0c;\u7406\u89e3recover\u7684\u6267\u884c\u903b\u8f91&#xff1a;<\/p>\n<p><span class=\"token keyword\">package<\/span> main<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token string\">&#034;errors&#034;<\/span><br \/>\n    <span class=\"token string\">&#034;fmt&#034;<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">func<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u9519\u8bef\u7528\u6cd51&#xff1a;panic\u540e\u8c03\u7528recover&#xff08;\u65e0\u6267\u884c\u673a\u4f1a&#xff09;<\/span><br \/>\n    <span class=\"token function\">panic<\/span><span class=\"token punctuation\">(<\/span>errors<span class=\"token punctuation\">.<\/span><span class=\"token function\">New<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;something wrong&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    p <span class=\"token operator\">:&#061;<\/span> <span class=\"token function\">recover<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u8fd9\u884c\u4ee3\u7801\u6c38\u8fdc\u4e0d\u4f1a\u6267\u884c<\/span><br \/>\n    fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;panic: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> p<span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u9519\u8bef\u7528\u6cd52&#xff1a;\u5148\u8c03\u7528recover&#xff08;\u65e0panic\u65f6\u8fd4\u56denil&#xff09;<\/span><br \/>\n    <span class=\"token comment\">\/\/ p :&#061; recover() \/\/ \u8fd4\u56denil<\/span><br \/>\n    <span class=\"token comment\">\/\/ panic(errors.New(&#034;something wrong&#034;))<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u9519\u8bef\u6839\u6e90&#xff1a;<\/p>\n<ul>\n<li>panic\u89e6\u53d1\u540e&#xff0c;\u63a7\u5236\u6743\u4f1a\u7acb\u5373\u6cbf\u8c03\u7528\u6808\u53cd\u5411\u4f20\u64ad&#xff0c;panic\u540e\u7684\u4ee3\u7801\u5b8c\u5168\u6ca1\u6709\u6267\u884c\u673a\u4f1a&#xff1b;<\/li>\n<li>\u65e0panic\u65f6\u8c03\u7528recover&#xff0c;\u51fd\u6570\u53ea\u4f1a\u8fd4\u56denil&#xff0c;\u6beb\u65e0\u610f\u4e49\u3002<\/li>\n<\/ul>\n<h4>2. \u6b63\u786e\u7528\u6cd5&#xff1a;defer &#043; recover<\/h4>\n<p>defer\u8bed\u53e5\u7684\u7279\u6027\u662f&#xff1a;\u6240\u5c5e\u51fd\u6570\u5373\u5c06\u7ed3\u675f\u65f6&#xff08;\u65e0\u8bba\u6b63\u5e38\u7ed3\u675f\u8fd8\u662fpanic\u5bfc\u81f4\u7684\u7ec8\u6b62&#xff09;&#xff0c;\u5ef6\u8fdf\u6267\u884c\u7684defer\u51fd\u6570\u4e00\u5b9a\u4f1a\u88ab\u8c03\u7528\u3002\u56e0\u6b64&#xff0c;recover\u5fc5\u987b\u7ed3\u5408defer\u4f7f\u7528&#xff1a;<\/p>\n<p><span class=\"token keyword\">package<\/span> main<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token string\">&#034;errors&#034;<\/span><br \/>\n    <span class=\"token string\">&#034;fmt&#034;<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">func<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Enter function main.&#034;<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6838\u5fc3&#xff1a;defer\u8bed\u53e5\u5199\u5728\u51fd\u6570\u5f00\u5934&#xff0c;\u786e\u4fdd\u80fd\u62e6\u622a\u540e\u7eed\u7684panic<\/span><br \/>\n    <span class=\"token keyword\">defer<\/span> <span class=\"token keyword\">func<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Enter defer function.&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> p <span class=\"token operator\">:&#061;<\/span> <span class=\"token function\">recover<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> p <span class=\"token operator\">!&#061;<\/span> <span class=\"token boolean\">nil<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6062\u590dpanic: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> p<span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;\u6062\u590dpanic: something wrong<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Exit defer function.&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u89e6\u53d1panic<\/span><br \/>\n    <span class=\"token function\">panic<\/span><span class=\"token punctuation\">(<\/span>errors<span class=\"token punctuation\">.<\/span><span class=\"token function\">New<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;something wrong&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Exit function main.&#034;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u4e0d\u4f1a\u6267\u884c<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5173\u952e\u6ce8\u610f\u70b9&#xff1a;<\/p>\n<ul>\n<li>defer\u8bed\u53e5\u8981\u5199\u5728\u53ef\u80fd\u89e6\u53d1panic\u7684\u4ee3\u7801\u4e4b\u524d&#xff08;\u5efa\u8bae\u51fd\u6570\u5f00\u5934&#xff09;&#xff0c;\u5426\u5219panic\u89e6\u53d1\u540e&#xff0c;\u540e\u7eed\u7684defer\u8bed\u53e5\u65e0\u6cd5\u6267\u884c&#xff1b;<\/li>\n<li>recover\u7684\u8fd4\u56de\u503c\u662fpanic\u643a\u5e26\u7684\u503c&#xff08;\u7a7a\u63a5\u53e3\u7c7b\u578b&#xff09;&#xff0c;\u9700\u7c7b\u578b\u65ad\u8a00\u540e\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<h3>\u4e09\u3001defer&#xff1a;\u591a\u6761\u8bed\u53e5\u7684\u6267\u884c\u987a\u5e8f&#xff1f;\u5faa\u73af\u4e2d\u7684\u5751&#xff1f;<\/h3>\n<p>defer\u662fGo\u8bed\u8a00\u7684\u201c\u5ef6\u8fdf\u6267\u884c\u795e\u5668\u201d&#xff0c;\u4f46\u5b83\u7684\u6267\u884c\u987a\u5e8f\u662f\u9762\u8bd5\u4e2d\u6700\u5bb9\u6613\u51fa\u9519\u7684\u70b9&#xff1a;\u540c\u4e00\u4e2a\u51fd\u6570\u4e2d&#xff0c;defer\u51fd\u6570\u7684\u6267\u884c\u987a\u5e8f\u4e0edefer\u8bed\u53e5\u7684\u6267\u884c\u987a\u5e8f\u5b8c\u5168\u76f8\u53cd&#xff08;\u540e\u8fdb\u5148\u51fa&#xff0c;FILO&#xff09;\u3002<\/p>\n<h4>1. \u591a\u6761defer\u8bed\u53e5\u7684\u6267\u884c\u987a\u5e8f<\/h4>\n<p>\u793a\u4f8b&#xff1a;<\/p>\n<p><span class=\"token keyword\">package<\/span> main<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token string\">&#034;fmt&#034;<\/span><\/p>\n<p><span class=\"token keyword\">func<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">defer<\/span> fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;defer 1&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">defer<\/span> fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;defer 2&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">defer<\/span> fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;defer 3&#034;<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;main func execute&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8f93\u51fa\u7ed3\u679c&#xff08;\u5148\u6267\u884c\u6700\u540e\u5b9a\u4e49\u7684defer&#xff09;&#xff1a;<\/p>\n<p>main func execute<br \/>\ndefer 3<br \/>\ndefer 2<br \/>\ndefer 1<\/p>\n<p>\u539f\u7406&#xff1a;Go\u8bed\u8a00\u4f1a\u628a\u6bcf\u6b21\u6267\u884c\u7684defer\u8bed\u53e5&#xff08;\u542b\u51fd\u6570\u548c\u53c2\u6570&#xff09;\u5b58\u5165\u4e00\u4e2a\u5148\u8fdb\u540e\u51fa\u7684\u94fe\u8868&#xff08;\u6808&#xff09;&#xff0c;\u51fd\u6570\u7ed3\u675f\u65f6\u4ece\u94fe\u8868\u5c3e\u90e8\u9010\u4e2a\u53d6\u51fa\u6267\u884c\u3002<\/p>\n<h4>2. \u5faa\u73af\u4e2ddefer\u7684\u5751\u70b9<\/h4>\n<p>\u82e5defer\u8bed\u53e5\u51fa\u73b0\u5728\u5faa\u73af\u4e2d&#xff0c;\u6bcf\u6b21\u5faa\u73af\u6267\u884cdefer\u8bed\u53e5&#xff0c;\u90fd\u4f1a\u751f\u6210\u4e00\u4e2a\u65b0\u7684\u5ef6\u8fdf\u8c03\u7528&#xff0c;\u6267\u884c\u987a\u5e8f\u4f9d\u7136\u662f\u201c\u540e\u8fdb\u5148\u51fa\u201d&#xff1a;<\/p>\n<p><span class=\"token keyword\">package<\/span> main<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token string\">&#034;fmt&#034;<\/span><\/p>\n<p><span class=\"token keyword\">func<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> i <span class=\"token operator\">:&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">defer<\/span> fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;defer %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> i<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8f93\u51fa\u7ed3\u679c&#xff1a;<\/p>\n<p>defer 2<br \/>\ndefer 1<br \/>\ndefer 0<\/p>\n<p>\u8fd9\u4e2a\u7279\u6027\u5728\u5904\u7406\u8d44\u6e90&#xff08;\u5982\u5173\u95ed\u6587\u4ef6\u3001\u91ca\u653e\u8fde\u63a5&#xff09;\u65f6\u5c24\u5176\u8981\u6ce8\u610f&#xff1a;\u5faa\u73af\u4e2ddefer\u5173\u95ed\u6587\u4ef6\u53e5\u67c4&#xff0c;\u53ef\u80fd\u5bfc\u81f4\u53e5\u67c4\u6cc4\u9732&#xff08;\u76f4\u5230\u51fd\u6570\u7ed3\u675f\u624d\u4f1a\u6279\u91cf\u5173\u95ed&#xff09;&#xff0c;\u5efa\u8bae\u628a\u5faa\u73af\u5185\u7684\u903b\u8f91\u62bd\u6210\u5b50\u51fd\u6570&#xff0c;\u5728\u5b50\u51fd\u6570\u5185\u4f7f\u7528defer\u3002<\/p>\n<h4>3. \u989d\u5916\u5751\u70b9&#xff1a;defer\u53c2\u6570\u7684\u201c\u5373\u65f6\u6c42\u503c\u201d<\/h4>\n<p>defer\u8bed\u53e5\u4e2d\u7684\u51fd\u6570\u53c2\u6570&#xff0c;\u4f1a\u5728defer\u8bed\u53e5\u6267\u884c\u65f6\u7acb\u5373\u6c42\u503c&#xff0c;\u800c\u975edefer\u51fd\u6570\u6267\u884c\u65f6&#xff1a;<\/p>\n<p><span class=\"token keyword\">package<\/span> main<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token string\">&#034;fmt&#034;<\/span><\/p>\n<p><span class=\"token keyword\">func<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    a<span class=\"token punctuation\">,<\/span> b <span class=\"token operator\">:&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u6b64\u5904a&#043;b&#061;2\u4f1a\u7acb\u5373\u6c42\u503c&#xff0c;\u5b58\u5165defer\u7684\u53c2\u6570\u5217\u8868<\/span><br \/>\n    <span class=\"token keyword\">defer<\/span> <span class=\"token keyword\">func<\/span><span class=\"token punctuation\">(<\/span>flag <span class=\"token builtin\">int<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Println<\/span><span class=\"token punctuation\">(<\/span>flag<span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa2&#xff0c;\u800c\u975e4<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">(<\/span>a <span class=\"token operator\">&#043;<\/span> b<span class=\"token punctuation\">)<\/span><\/p>\n<p>    a<span class=\"token punctuation\">,<\/span> b <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span> <span class=\"token comment\">\/\/ \u540e\u7eed\u4fee\u6539\u4e0d\u5f71\u54cd\u5df2\u6c42\u503c\u7684\u53c2\u6570<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5982\u679c\u60f3\u8ba9defer\u51fd\u6570\u6267\u884c\u65f6\u518d\u83b7\u53d6\u6700\u65b0\u503c&#xff0c;\u53ef\u5c06\u53c2\u6570\u6539\u4e3a\u95ed\u5305\u5f15\u7528&#xff1a;<\/p>\n<p><span class=\"token keyword\">defer<\/span> <span class=\"token keyword\">func<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Println<\/span><span class=\"token punctuation\">(<\/span>a <span class=\"token operator\">&#043;<\/span> b<span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa4<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<h3>\u56db\u3001\u8fdb\u9636\u5751\u70b9\u4e0e\u601d\u8003\u9898<\/h3>\n<h4>1. goroutine\u4e2d\u7684panic\u65e0\u6cd5\u88ab\u5916\u90e8recover<\/h4>\n<p>\u8fd9\u662f\u5f00\u53d1\u4e2d\u9ad8\u9891\u8e29\u5751\u70b9&#xff1a;goroutine\u662f\u72ec\u7acb\u7684\u6267\u884c\u6808&#xff0c;\u5916\u90e8\u51fd\u6570\u7684defer&#043;recover\u65e0\u6cd5\u6355\u83b7goroutine\u5185\u7684panic&#xff1a;<\/p>\n<p><span class=\"token keyword\">package<\/span> main<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token string\">&#034;errors&#034;<\/span><br \/>\n    <span class=\"token string\">&#034;fmt&#034;<\/span><br \/>\n    <span class=\"token string\">&#034;sync&#034;<\/span><br \/>\n    <span class=\"token string\">&#034;time&#034;<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">func<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">defer<\/span> <span class=\"token keyword\">func<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> p <span class=\"token operator\">:&#061;<\/span> <span class=\"token function\">recover<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> p <span class=\"token operator\">!&#061;<\/span> <span class=\"token boolean\">nil<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6062\u590dpanic:&#034;<\/span><span class=\"token punctuation\">,<\/span> p<span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u4e0d\u4f1a\u6267\u884c<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token keyword\">var<\/span> wg sync<span class=\"token punctuation\">.<\/span>WaitGroup<br \/>\n    wg<span class=\"token punctuation\">.<\/span><span class=\"token function\">Add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">go<\/span> <span class=\"token keyword\">func<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">defer<\/span> wg<span class=\"token punctuation\">.<\/span><span class=\"token function\">Done<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token function\">panic<\/span><span class=\"token punctuation\">(<\/span>errors<span class=\"token punctuation\">.<\/span><span class=\"token function\">New<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;goroutine\u5185\u7684panic&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u7a0b\u5e8f\u4f9d\u7136\u5d29\u6e83<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    wg<span class=\"token punctuation\">.<\/span><span class=\"token function\">Wait<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    time<span class=\"token punctuation\">.<\/span><span class=\"token function\">Sleep<\/span><span class=\"token punctuation\">(<\/span>time<span class=\"token punctuation\">.<\/span>Second<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u89e3\u51b3\u65b9\u6848&#xff1a;\u5728goroutine\u5185\u90e8\u4f7f\u7528defer&#043;recover&#xff1a;<\/p>\n<p><span class=\"token keyword\">go<\/span> <span class=\"token keyword\">func<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">defer<\/span> <span class=\"token keyword\">func<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> p <span class=\"token operator\">:&#061;<\/span> <span class=\"token function\">recover<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> p <span class=\"token operator\">!&#061;<\/span> <span class=\"token boolean\">nil<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6062\u590dgoroutine panic:&#034;<\/span><span class=\"token punctuation\">,<\/span> p<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        wg<span class=\"token punctuation\">.<\/span><span class=\"token function\">Done<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">panic<\/span><span class=\"token punctuation\">(<\/span>errors<span class=\"token punctuation\">.<\/span><span class=\"token function\">New<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;goroutine\u5185\u7684panic&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<h4>2. \u601d\u8003\u9898&#xff1a;defer\u4e2d\u53ef\u4ee5\u5f15\u53d1panic\u5417&#xff1f;<\/h4>\n<p>\u7b54\u6848&#xff1a;\u53ef\u4ee5&#xff01;\u82e5defer\u51fd\u6570\u4e2d\u89e6\u53d1panic&#xff0c;\u4f1a\u8986\u76d6\u539f\u6709\u7684panic&#xff0c;\u4e14\u9700\u8981\u66f4\u5916\u5c42\u7684defer&#043;recover\u6765\u6062\u590d&#xff1a;<\/p>\n<p><span class=\"token keyword\">package<\/span> main<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token string\">&#034;errors&#034;<\/span><br \/>\n    <span class=\"token string\">&#034;fmt&#034;<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">func<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">defer<\/span> <span class=\"token keyword\">func<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> p <span class=\"token operator\">:&#061;<\/span> <span class=\"token function\">recover<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> p <span class=\"token operator\">!&#061;<\/span> <span class=\"token boolean\">nil<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5916\u5c42\u6062\u590dpanic:&#034;<\/span><span class=\"token punctuation\">,<\/span> p<span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;\u5916\u5c42\u6062\u590dpanic: defer\u4e2d\u7684panic<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token keyword\">defer<\/span> <span class=\"token keyword\">func<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">panic<\/span><span class=\"token punctuation\">(<\/span>errors<span class=\"token punctuation\">.<\/span><span class=\"token function\">New<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;defer\u4e2d\u7684panic&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u8986\u76d6\u539f\u6709panic<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token function\">panic<\/span><span class=\"token punctuation\">(<\/span>errors<span class=\"token punctuation\">.<\/span><span class=\"token function\">New<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u539f\u59cbpanic&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>3. \u6062\u590dpanic\u540e&#xff0c;\u51fd\u6570\u80fd\u8fd4\u56de\u9519\u8bef\u5417&#xff1f;<\/h4>\n<p>\u53ef\u4ee5&#xff01;\u901a\u8fc7\u547d\u540d\u8fd4\u56de\u503c&#xff0c;\u5728defer\u4e2d\u4fee\u6539\u8fd4\u56de\u503c&#xff1a;<\/p>\n<p><span class=\"token keyword\">package<\/span> main<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token string\">&#034;errors&#034;<\/span><br \/>\n    <span class=\"token string\">&#034;fmt&#034;<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">func<\/span> <span class=\"token function\">caller<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">(<\/span>err <span class=\"token builtin\">error<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">defer<\/span> <span class=\"token keyword\">func<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> p <span class=\"token operator\">:&#061;<\/span> <span class=\"token function\">recover<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> p <span class=\"token operator\">!&#061;<\/span> <span class=\"token boolean\">nil<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u5c06panic\u8f6c\u4e3a\u666e\u901a\u9519\u8bef\u8fd4\u56de<\/span><br \/>\n            err <span class=\"token operator\">&#061;<\/span> fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Errorf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6355\u83b7panic: %v&#034;<\/span><span class=\"token punctuation\">,<\/span> p<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    s1 <span class=\"token operator\">:&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token builtin\">int<\/span><span class=\"token punctuation\">{<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token boolean\">_<\/span> <span class=\"token operator\">&#061;<\/span> s1<span class=\"token punctuation\">[<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token comment\">\/\/ \u89e6\u53d1\u6570\u7ec4\u8d8a\u754cpanic<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">nil<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">func<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> err <span class=\"token operator\">:&#061;<\/span> <span class=\"token function\">caller<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> err <span class=\"token operator\">!&#061;<\/span> <span class=\"token boolean\">nil<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Println<\/span><span class=\"token punctuation\">(<\/span>err<span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;\u6355\u83b7panic: runtime error: index out of range [5] with length 3<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u4e94\u3001\u4e3a\u4ec0\u4e48Go\u4e0d\u7528try-catch&#xff0c;\u800c\u9009defer-recover&#xff1f;<\/h3>\n<p>\u8fd9\u662f\u9762\u8bd5\u4e2d\u201c\u62d4\u9ad8\u7c7b\u201d\u95ee\u9898&#xff0c;\u6838\u5fc3\u8bbe\u8ba1\u8003\u91cf&#xff1a;<\/p>\n<li>\u533a\u5206\u9519\u8bef\u548c\u5f02\u5e38&#xff1a;Go\u8bed\u8a00\u8ba4\u4e3a&#xff0c;error\u662f\u53ef\u9884\u89c1\u7684\u4e1a\u52a1\u9519\u8bef&#xff08;\u5982\u53c2\u6570\u9519\u8bef\u3001\u7f51\u7edc\u8d85\u65f6&#xff09;&#xff0c;\u5e94\u663e\u5f0f\u8fd4\u56de\u5e76\u5904\u7406&#xff1b;panic\u662f\u4e0d\u53ef\u9884\u89c1\u7684\u8fd0\u884c\u65f6\u5f02\u5e38&#xff08;\u5982\u6570\u7ec4\u8d8a\u754c&#xff09;&#xff0c;\u624d\u7528recover\u6062\u590d&#xff0c;\u907f\u514d\u5f00\u53d1\u8005\u6ee5\u7528\u201c\u5f02\u5e38\u6355\u83b7\u201d\u628a\u6240\u6709\u903b\u8f91\u5305\u5728try\u5757\u4e2d&#xff1b;<\/li>\n<li>\u6027\u80fd\u8003\u91cf&#xff1a;try-catch\u7684\u5e95\u5c42\u5b9e\u73b0&#xff08;\u5982Java&#xff09;\u6709\u989d\u5916\u7684\u6027\u80fd\u5f00\u9500&#xff0c;\u800cdefer-recover\u57fa\u4e8esetjmp\/longjmp\u5b9e\u73b0&#xff0c;\u5f00\u9500\u66f4\u5c0f&#xff1b;<\/li>\n<li>\u7b80\u6d01\u6027&#xff1a;defer\u4e0d\u4ec5\u80fd\u5904\u7406\u5f02\u5e38&#xff0c;\u8fd8\u80fd\u7edf\u4e00\u7ba1\u7406\u8d44\u6e90\u91ca\u653e&#xff08;\u5982\u5173\u95ed\u6587\u4ef6\u3001\u89e3\u9501\u9501&#xff09;&#xff0c;\u4e00\u7269\u591a\u7528&#xff0c;\u51cf\u5c11\u4ee3\u7801\u5197\u4f59\u3002<\/li>\n<h3>\u603b\u7ed3<\/h3>\n<p>Go\u8bed\u8a00\u7684panic\/recover\/defer\u662f\u4e00\u5957\u201c\u8f7b\u91cf\u4f46\u9ad8\u6548\u201d\u7684\u5f02\u5e38\u5904\u7406\u673a\u5236&#xff0c;\u6838\u5fc3\u8981\u70b9\u603b\u7ed3&#xff1a;<\/p>\n<li>panic\u4f18\u5148\u4f20error\u7c7b\u578b\u503c&#xff0c;\u786e\u4fdd\u5f02\u5e38\u4fe1\u606f\u53ef\u5e8f\u5217\u5316\u3001\u6613\u6392\u67e5&#xff1b;<\/li>\n<li>recover\u5fc5\u987b\u7ed3\u5408defer\u4f7f\u7528&#xff0c;\u4e14defer\u8bed\u53e5\u8981\u5199\u5728\u53ef\u80fd\u89e6\u53d1panic\u7684\u4ee3\u7801\u4e4b\u524d&#xff1b;<\/li>\n<li>defer\u51fd\u6570\u6267\u884c\u987a\u5e8f\u662f\u201c\u540e\u8fdb\u5148\u51fa\u201d&#xff0c;\u5faa\u73af\u4e2d\u4f7f\u7528\u9700\u6ce8\u610f\u8d44\u6e90\u6cc4\u9732&#xff0c;\u4e14\u53c2\u6570\u662f\u201c\u5373\u65f6\u6c42\u503c\u201d&#xff1b;<\/li>\n<li>goroutine\u5185\u7684panic\u9700\u5728\u5185\u90e8\u6062\u590d&#xff0c;\u5916\u90e8\u65e0\u6cd5\u6355\u83b7&#xff1b;<\/li>\n<li>Go\u7684\u8bbe\u8ba1\u903b\u8f91\u662f\u201c\u663e\u5f0f\u5904\u7406\u9519\u8bef&#xff0c;\u8c28\u614e\u6062\u590d\u5f02\u5e38\u201d&#xff0c;\u533a\u522b\u4e8etry-catch\u7684\u201c\u5927\u5305\u5927\u63fd\u201d\u3002<\/li>\n<p>\u638c\u63e1\u8fd9\u4e9b\u77e5\u8bc6\u70b9&#xff0c;\u4e0d\u4ec5\u80fd\u907f\u5f00\u5f00\u53d1\u4e2d\u7684\u5751&#xff0c;\u9762\u5bf9\u9762\u8bd5\u4e2d\u5173\u4e8epanic\/recover\/defer\u7684\u8ffd\u95ee\u4e5f\u80fd\u6e38\u5203\u6709\u4f59&#xff01;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u70b9\u51fb\u6295\u7968\u4e3a\u6211\u76842025\u535a\u5ba2\u4e4b\u661f\u8bc4\u9009\u52a9\u529b&#xff01; \u5403\u900fGo\u8bed\u8a00\u5f02\u5e38\u5904\u7406&#xff01;panic\/recover\/defer\u6838\u5fc3\u7528\u6cd5\u907f\u5751\u6307\u5357&#xff0c;\u9762\u8bd5\u7a33\u4e86<br \/>\n\u5728Java\u3001C\u7b49\u8bed\u8a00\u4e2d&#xff0c;\u5f02\u5e38\u5904\u7406\u9760try-catch-finally\u4e09\u677f\u65a7&#xff0c;\u4f46Go\u8bed\u8a00\u504f\u504f\u4e0d\u8d70\u5bfb\u5e38\u8def\u2014\u2014\u7528panic\u3001recover\u3001defer\u7684\u7ec4\u5408\u5b9e\u73b0\u5f02\u5e38\u5904\u7406\u903b\u8f91\u3002<br \/>\n\u8fd9\u4e09\u4e2a\u5173\u952e\u5b57\u4e0d\u4ec5\u662fGo\u5f00\u53d1\u7684\u6838\u5fc3\u77e5\u8bc6\u70b9&#xff0c;\u66f4\u662f\u9762\u8bd5\u4e2d\u9762\u8bd5\u5b98\u201c\u8ffd\u7740\u95ee\u201d\u7684\u9ad8\u9891\u8003\u70b9&#xff0c;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[6736,6838,745,746,87,292,190],"topic":[],"class_list":["post-67463","post","type-post","status-publish","format-standard","hentry","category-server","tag-6736","tag-6838","tag-go","tag-golang","tag-87","tag-292","tag-190"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>22\u3001\u5403\u900fGo\u8bed\u8a00\u5f02\u5e38\u5904\u7406\uff01panic\/recover\/defer\u6838\u5fc3\u7528\u6cd5+\u907f\u5751\u6307\u5357\uff0c\u9762\u8bd5\u7a33\u4e86 - 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