{"id":7944,"date":"2023-01-28T13:59:02","date_gmt":"2023-01-28T05:59:02","guid":{"rendered":"https:\/\/egonlin.com\/?p=7944"},"modified":"2023-01-28T13:59:02","modified_gmt":"2023-01-28T05:59:02","slug":"23-%e5%87%bd%e6%95%b0%e4%bd%9c%e7%94%a8%e5%9f%9f%e4%b8%8e%e9%97%ad%e5%8c%85","status":"publish","type":"post","link":"https:\/\/egonlin.com\/?p=7944","title":{"rendered":"23 \u51fd\u6570\u4f5c\u7528\u57df\u4e0e\u95ed\u5305"},"content":{"rendered":"<h1>\u4f5c\u7528\u57df<\/h1>\n<p>\u4f5c\u7528\u57df\u5e76\u975e\u51fd\u6570\u7684\u5b50\u77e5\u8bc6\u70b9\uff0c\u4e4b\u6240\u4ee5\u5728\u6b64\u5904\u4ecb\u7ecd\uff0c\u662f\u56e0\u4e3a\u5728\u5b66\u4e60\u5b8c\u51fd\u6570\u57fa\u672c\u4f7f\u7528\u540e\uff0c\u6211\u4eec\u624d\u53ef\u4ee5\u6210\u4f53\u7cfb\u4ecb\u7ecd\u5b83<\/p>\n<h2>\u4e00 \u4f5c\u7528\u57df\u4ecb\u7ecd<\/h2>\n<ul>\n<li>\n<p>1\u3001\u4ec0\u4e48\u662f\u4f5c\u7528\u57df\uff1f<\/p>\n<p>\u57df\u6307\u7684\u662f\u8303\u56f4\uff0c\u4f5c\u7528\u57df\u540d\u6307\u7684\u662f\u540d\u5b57\uff08\u53d8\u91cf\u540d\u3001\u51fd\u6570\u540d\u7b49\uff09\u53ef\u4ee5\u88ab\u6709\u6548\u8bbf\u95ee\u7684\u8303\u56f4<\/p>\n<\/li>\n<li>\n<p>2\u3001\u4e3a\u4f55\u8981\u5b66\u4e60\u4f5c\u7528\u57df\uff1f<\/p>\n<p>\u58f0\u660e\u8bed\u53e5\u4f1a\u5c06\u7a0b\u5e8f\u4e2d\u7684\u5b9e\u4f53\u548c\u4e00\u4e2a\u540d\u5b57\u5173\u8054\uff0c\u6bd4\u5982\u51fd\u6570\u540d\u3001\u53d8\u91cf\u540d\u7b49\u540d\u5b57\uff0c\u800c\u58f0\u660e\u7684\u610f\u4e49\u5728\u4e8e\u4ee5\u540e\u5f15\u7528\uff0c\u82e5\u60f3\u5f15\u7528\u58f0\u660e\u5b9e\u4f53\u5c31\u9700\u8981\u7528\u5230\u540d\u5b57\uff0c\u4f46\u6211\u4eec\u5728\u7a0b\u5e8f\u4e2d\u58f0\u660e\u4e86\u90a3\u4e48\u591a\u540d\u5b57\uff0c\u5f53\u5f15\u7528\u4e00\u4e2a\u540d\u5b57\u65f6\u5e94\u8be5\u53bb\u54ea\u91cc\u627e\uff1f\u540d\u5b57\u82e5\u51fa\u73b0\u51b2\u7a81\u4e86\uff0c\u8bbf\u95ee\u7684\u4f18\u5148\u7ea7\u662f\u4ec0\u4e48\uff1f\u8fd9\u5c31\u662f\u6211\u4eec\u5b66\u4e60\u4f5c\u7528\u57df\u7684\u610f\u4e49\u3002<\/p>\n<\/li>\n<li>\n<p>3\u3001\u8bcd\u6cd5\u57df<\/p>\n<p>\u4f5c\u7528\u57df\u5206\u4e3a\u9759\u6001\u4f5c\u7528\u57df(\u53c8\u79f0\u4e4b\u4e3a\u8bcd\u6cd5\u57df)\u4e0e\u52a8\u6001\u4f5c\u7528\u57df\uff0cgo\u4e0epython\u90fd\u662f\u9759\u6001\u4f5c\u7528\u57df\uff0c\u8be6\u89e3\u5982\u4e0b<\/p>\n<pre><code class=\"language-go\">\u7f16\u8bd1\u5668\u7684\u7b2c\u4e00\u4e2a\u5de5\u4f5c\u9636\u6bb5\u53eb\u505a\u8bcd\u6cd5\u5316\uff0c\u4e5f\u53eb\u5355\u8bcd\u5316\uff0c\u6240\u4ee5\u8bf4\uff0c\u8bcd\u6cd5\u4f5c\u7528\u57df\u662f\u5728\u8bcd\u6cd5\u9636\u6bb5\u751f\u6210\u7684\u4f5c\u7528\u57df\uff0c\u662f\u4e00\u4e2a\u7f16\u8bd1\u65f6\u7684\u6982\u5ff5\u3002\u4e0e\u8bcd\u6cd5\u57df\u76f8\u5bf9\u5e94\u7684\u662f\u52a8\u6001\u4f5c\u7528\u57df\uff0c\u4e8c\u8005\u5bf9\u6bd4\u5982\u4e0b\n1\u3001\u8bcd\u6cd5\u4f5c\u7528\u57df\uff1a\u53d8\u91cf\u7684\u4f5c\u7528\u57df\u662f\u5728\u5b9a\u4e49\u65f6\u51b3\u5b9a\u800c\u4e0d\u662f\u6267\u884c\u65f6\u51b3\u5b9a\uff0c\u4e5f\u5c31\u662f\u8bf4\u8bcd\u6cd5\u4f5c\u7528\u57df\u53d6\u51b3\u4e8e\u6e90\u7801\uff0c\u901a\u8fc7\u9759\u6001\u5206\u6790\u5c31\u80fd\u786e\u5b9a\uff0c\u56e0\u6b64\u8bcd\u6cd5\u4f5c\u7528\u57df\u4e5f\u53eb\u505a\u9759\u6001\u4f5c\u7528\u57df\u3002\u800c\u52a8\u6001\u4f5c\u7528\u57df\u662f\u5728\u8fd0\u884c\u65f6\u786e\u5b9a\u7684\u3002\n3\u3001\u8bcd\u6cd5\u4f5c\u7528\u57df\u5173\u6ce8\u51fd\u6570\u5728\u4f55\u5904\u58f0\u660e\uff0c\u800c\u52a8\u6001\u4f5c\u7528\u57df\u5173\u6ce8\u51fd\u6570\u4ece\u4f55\u5904\u8c03\u7528\uff0c\u5373\u52a8\u6001\u4f5c\u7528\u57df\u94fe\u662f\u57fa\u4e8e\u8fd0\u884c\u65f6\u7684\u8c03\u7528\u6808\u7684<\/code><\/pre>\n<p>\u603b\u7ed3\uff1a\u8bcd\u6cd5\u57df\u662f\u58f0\u660e\u8bed\u53e5\u7684\u57df\uff0c\u800c\u975e\u5f15\u7528\u8bed\u53e5\u7684\u57df\uff0c\u5373\u58f0\u660e\u8bed\u53e5\u7684\u5730\u65b9\u51b3\u5b9a\u4e86\u4f5c\u7528\u57df\u3002<\/p>\n<p>\u8be6\u7ec6\u5730\u8bf4\u5c31\u662f\uff1a<\/p>\n<p>\u5c42\u5c42\u5d4c\u5957\u7684\u5173\u7cfb\u662f\u4ee5\u5b9a\u4e49\/\u58f0\u660e\u9636\u6bb5\u4e3a\u51c6\u751f\u6210\u7684\uff0c\u5b9a\u4e49\/\u58f0\u660e\u4f4d\u7f6e\u51b3\u5b9a\u4e86\u4f5c\u7528\u57df\u7684\u5d4c\u5957\u5173\u7cfb\u800c\u4e0e\u5f15\u7528\u4f4d\u7f6e\u65e0\u5173\uff0c\u5373\u65e0\u8bba\u5728\u4f55\u5904\u5f15\u7528\/\u67e5\u627e\u540d\u5b57\uff0c\u90fd\u9700\u8981\u8001\u8001\u5b9e\u5b9e\u5730\u56de\u5230\u8be5\u540d\u5b57\u5f53\u521d\u5b9a\u4e49\u7684\u5730\u65b9\u53bb\u627e\u4f5c\u7528\u57df\u5173\u7cfb\uff0c\u7136\u540e\u4ee5\u6b64\u4e3a\u51c6\uff0c\u7531\u5185\u5411\u5916\u4e00\u5c42\u5c42\u67e5\u627e<\/p>\n<p>\u6240\u4ee5\uff0c\u641e\u6e05\u695a\u4f5c\u7528\u57df\u7684\u5173\u952e\u5728\u4e8e\u4e86\u89e3\u58f0\u660e\u8bed\u53e5\u90fd\u53ef\u4ee5\u58f0\u660e\u5728\u54ea\u4e9b\u5730\u65b9\uff0c\u8bf7\u770b\u4e0b\u4e00\u5c0f\u8282<\/p>\n<\/li>\n<\/ul>\n<h2>\u4e8c \u4ee3\u7801\u5757\u4e0e\u4f5c\u7528\u57df<\/h2>\n<p>\u6beb\u65e0\u7591\u95ee\uff0c\u58f0\u660e\u8bed\u53e5\u80af\u5b9a\u662f\u5904\u4e8e\u67d0\u4e00\u7ea7\u522b\u7684\u4ee3\u7801\u5757\u91cc\uff0c\u90a3\u4ec0\u4e48\u662f\u4ee3\u7801\u5757\u5462\uff0c\u53c8\u662f\u5982\u4f55\u533a\u5206\u5c42\u7ea7\u7684\u5462\uff1f<\/p>\n<p>\u4ee3\u7801\u5757\u6307\u7684\u662f\u4e00\u7ec4\u7684\u4ee3\u7801\uff08\u58f0\u660e\u8bed\u53e5\u80af\u5b9a\u4e5f\u662f\u4ee3\u7801\uff09\u96c6\u5408<\/p>\n<pre><code class=\"language-go\">\u8865\u5145\u8bf4\u660e\uff1a\n1\u3001\u540c\u4e00\u7ec4\u4ee3\u7801\u5c5e\u4e8e\u4e00\u4e2a\u7ea7\u522b\uff0c\u540c\u7ea7\u4ee3\u7801\u4f1a\u6309\u7167\u81ea\u4e0a\u800c\u4e0b\u7684\u987a\u5e8f\u4f9d\u6b21\u6267\u884c\u3002\n2\u3001\u8bed\u6cd5\u5757\/\u8bed\u53e5\u5757\u6307\u7684\u5c31\u662f\u4e00\u7ec4\u58f0\u660e\u8bed\u53e5\u7684\u96c6\u5408\uff0c\u4e0e\u4ee3\u7801\u5757\u5176\u5b9e\u662f\u4e00\u4e2a\u4e1c\u897f,\u4e0d\u5fc5\u7ea0\u7ed3\u6b64\u6982\u5ff5<\/code><\/pre>\n<p>go\u8bed\u8a00\u4e2d\u6709\u7528{}\u7684\u663e\u5f0f\u58f0\u660e\u7684\u4ee3\u7801\u5757\uff0c\u5f53\u7136\u4e5f\u6709\u6ca1\u6709\u7528{}\u5305\u542b\u7684\u9690\u5f0f\u4ee3\u7801\u5757\uff0c\u4e3b\u8981\u6709\u4ee5\u4e0b\u51e0\u79cd\uff0c<\/p>\n<ul>\n<li>\n<p>1\u3001\u5168\u5c40\u8bed\u6cd5\u5757<\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u628a\u6574\u4e2a\u6e90\u4ee3\u7801\u770b\u6210\u4e00\u4e2a\u5927\u7684\u4ee3\u7801\u5757\uff0c\u5305\u542b\u5b83\u5916\u9762\u7684\uff0c\u4e5f\u5c31\u662f\u6700\u5916\u5c42\u7684\uff0c\u79f0\u4e4b\u4e3a\u5168\u5c40\u8bed\u6cd5\u5757\uff0c\u53ef\u4ee5\u5728\u6574\u4e2a\u7a0b\u5e8f\u4e2d\u76f4\u63a5\u4f7f\u7528\uff0c\u4f8b\u5982\u5185\u7f6e\u7684\u7c7b\u578b\u3001\u5185\u7f6e\u51fd\u6570\u3001\u5185\u7f6e\u7684\u5e38\u91cf\u7b49\u3002<\/p>\n<\/li>\n<li>\n<p>2\u3001\u5305\u7ea7\u8bed\u6cd5\u5757<\/p>\n<p>\u51fd\u6570\u5916\u90e8\u53ea\u80fd\u6709\u58f0\u660e\u8bed\u53e5\uff0c\u8fd9\u4e00\u7cfb\u5217\u7684\u58f0\u660e\u8bed\u53e5\u6784\u6210\u5305\u7ea7\u8bed\u6cd5\u5757\uff0c\u53ef\u4ee5\u5728\u540c\u4e00\u4e2a\u5305\u7684\u4efb\u4f55\u6e90\u6587\u4ef6\u4e2d\u8bbf\u95ee<\/p>\n<p>\u6ce8\u610f\uff1a\u9996\u5148\u5bfc\u5165\u8bed\u53e5\u4e5f\u662f\u58f0\u660e\u8bed\u53e5\uff0c\u53ea\u80fd\u5728\u5305\u7ea7\u58f0\u660e\uff0c\u7136\u540e\u5bf9\u4e8e\u5bfc\u5165\u7684\u5305\uff0c\u4f8b\u5982\u5728\u5f53\u524d\u6587\u4ef6\u4e2d\u5bfc\u5165\u7684fmt\u5305\uff0c\u5219\u662f\u5bf9\u5e94\u6e90\u6587\u4ef6\u7ea7\u7684\u4f5c\u7528\u57df\uff0c\u53ea\u80fd\u5728\u5f53\u524d\u7684\u6587\u4ef6\u4e2d\u8bbf\u95ee\u5bfc\u5165\u7684fmt\u5305\uff0c\u5373\u4fbf\u662f\u5f53\u524d\u5305\u7684\u5176\u5b83\u6e90\u6587\u4ef6\u4e5f\u65e0\u6cd5\u8bbf\u95ee\u5728\u5f53\u524d\u6e90\u6587\u4ef6\u5bfc\u5165\u7684\u5305\uff0c\u82e5\u4e5f\u60f3\u4f7f\u7528\u5305fmt\uff0c\u9700\u8981\u91cd\u65b0\u5bfc\u5165\u624d\u884c<\/p>\n<\/li>\n<li>\n<p>3\u3001\u51fd\u6570\u5185\u7684\u8bed\u6cd5\u5757<\/p>\n<ul>\n<li>\n<p>3.1 \u7528{}\u5305\u542b\u7684\u51fd\u6570\u4f53\u4ee3\u7801\uff0c\u662f\u51fd\u6570\u5185\u6700\u5916\u4e00\u5c42\u7684\u4ee3\u7801\u5757<\/p>\n<\/li>\n<li>\n<p>3.2 \u51fd\u6570\u5185\u7684\u8bed\u53e5\u5982\u6bcf\u4e2afor\u3001if\u3001switch\u8bed\u53e5\u58f0\u660e\u90e8\u5206<\/p>\n<\/li>\n<li>\n<p>3.3 \u6bcf\u4e2afor\u3001if\u3001switch\u8bed\u53e5{}\u5305\u542b\u7684\u5b50\u4ee3\u7801<\/p>\n<\/li>\n<li>\n<p>3.4 \u5355\u7eaf\u7528{}\u58f0\u660e\u7684\u5757<\/p>\n<\/li>\n<\/ul>\n<p>\u4e00\u4e2a\u4f8b\u5b50\u8bf4\u660e<\/p>\n<pre><code class=\"language-go\">package main\n\nimport \"fmt\"\n\nfunc main() {\n\/\/ 1\u3001\u6b64\u5904\u662f\u51fd\u6570\u6700\u5916\u5c42\u4e00\u5c42\u4ee3\u7801\u5757=>\u663e\u5f0f\u7684\nvar i int = 666\n\nfor i := 0; i < 3; i++ { \/\/ 2\u3001\u672c\u884c\u4ee3\u7801\u662ffor\u8bed\u53e5\u58f0\u660e\u90e8\u5206\u7684\u4ee3\u7801\u5757=>\u9690\u5f0f\u7684\n    \/\/ 3\u3001\u6b64\u5904\u662ffor\u5faa\u73af\u7684\u5b50\u4ee3\u7801\u5757=>\u663e\u5f0f\u7684\n    fmt.Println(i)\n}\n{\n      \/\/ 4\u3001\u6b64\u65f6\u662f\u5355\u7eaf\u7528{}\u58f0\u660e\u7684\u4e00\u7ea7\u4ee3\u7801\u5757=>\u663e\u5f0f\u7684\n    var i int = 777\n    fmt.Println(\"===>\", i)\n}\nfmt.Println(\"--->\", i)\n}<\/code><\/pre>\n<\/li>\n<\/ul>\n<p>\u603b\u7ed3\uff1a\u4ee3\u7801\u5757\u4e4b\u95f4\u6709\u5d4c\u5957\u5173\u7cfb\uff0c\u4e5f\u6709\u5e76\u5217\u5173\u7cfb\uff0c\u8fd9\u4e9b\u5173\u7cfb\u5230\u4e86\u540d\u5b57\u7684\u8bbf\u95ee\u987a\u5e8f\uff0c\u5373\u4f5c\u7528\u57df\u3002<\/p>\n<p>\u518d\u6765\u770b\u4f60\u4e00\u4e2a\u4f8b\u5b50\u5f3a\u5316\u4e00\u4e0b\u7406\u89e3<\/p>\n<pre><code class=\"language-go\">\/\/ \u53ef\u4ee5\u4f9d\u6b21\u6ce8\u91cavar\u58f0\u660e\u8bed\u53e5\u67e5\u770b\u6548\u679c\nimport &quot;fmt&quot;\n\nvar len int = 666\n\nfunc main() {\n    var len int = 777\n    {\n        var len int = 888\n        {\n            var len int = 999\n            fmt.Println(len) \/\/ 999\n        }\n        fmt.Println(len) \/\/ 888\n    }\n    fmt.Println(len) \/\/ 777\n}<\/code><\/pre>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2023\/01\/\u4f5c\u7528\u57df.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2023\/01\/\u4f5c\u7528\u57df.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<h2>\u4e09 \u5173\u4e8e\u4f5c\u7528\u57df\u5f3a\u8c036\u70b9<\/h2>\n<h3>3.1 \u8bcd\u6cd5\u57df\u7684\u6838\u5fc3<\/h3>\n<p>\u518d\u6b21\u5f3a\u8c03\u9759\u6001\u4f5c\u7528\u57df\/\u8bcd\u6cd5\u57df\u7684\u6838\u5fc3\u662f\uff1a\u5d4c\u5957\u5173\u7cfb\u662f\u4ee5\u5b9a\u4e49\/\u58f0\u660e\u65f6\u4e3a\u51c6\u7684<\/p>\n<pre><code class=\"language-go\">package main\n\nimport &quot;fmt&quot;\n\nvar x int = 111\n\nfunc foo() {\n    fmt.Println(x)\n}\n\nfunc main() {\n    var x int = 222\n    foo()          \/\/ \u8c03\u7528\u51fd\u6570\uff0c\u6253\u5370\u7ed3\u679c\u4e3a111\uff0c\u800c\u4e0d\u662f222\n    fmt.Println(x) \/\/ \u6253\u5370\u7ed3\u679c\u4e3a222\n}<\/code><\/pre>\n<h3>3.2 \u5173\u4e8e\u58f0\u660e\u540c\u540d\u53d8\u91cf\u7684\u95ee\u9898<\/h3>\n<ul>\n<li>\n<p>1\u3001\u540c\u4e00\u4e2a\u4f5c\u7528\u57df\u540d\uff0c\u540d\u5b57\u4e0d\u80fd\u91cd\u590d\uff0c\u8fd9\u70b9\u5199\u60ef\u4e86python\u7684\u4eba\u5f88\u5bb9\u6613\u72af\u9519<\/p>\n<pre><code class=\"language-go\">import \"fmt\"\n\nfunc main() {\nvar x int = 111\nvar x int = 222  \/\/ \u9519\u8bef\uff0c\u540c\u4e00\u4e2a\u4ee3\u7801\u5757\u4e2d\u4e0d\u80fd\u91cd\u590d\u58f0\u660e\nfmt.Println(x)  \n}<\/code><\/pre>\n<\/li>\n<li>\n<p>2\u3001\u5728\u4e0d\u540c\u7684\u4f5c\u7528\u57df\u786e\u5b9e\u53ef\u4ee5\u58f0\u660e\u76f8\u540c\u7684\u540d\u5b57\uff0c\u4f46\u662fgo\u8bed\u8a00\u4e0d\u5efa\u8bae\u8fd9\u4e48\u505a \uff082.1\u4e2d\u7684\u4f8b\u5b50\u53ea\u662f\u4e3a\u6f14\u793a\u65b9\u4fbf\uff09\uff0c\u56e0\u4e3a\u5982\u679c\u540d\u5b57\u5728\u5185\u90e8\u548c\u5916\u90e8\u7684\u5757\u5206\u522b\u58f0\u660e\u8fc7\uff0c\u5219\u5185\u90e8\u5757\u7684\u58f0\u660e\u9996\u5148\u88ab\u627e\u5230\uff0c\u6b64\u65f6\uff0c\u5185\u90e8\u58f0\u660e\u5c4f\u853d\u4e86\u5916\u90e8\u540c\u540d\u7684\u58f0\u660e\uff0c\u8ba9\u5916\u90e8\u7684\u58f0\u660e\u7684\u540d\u5b57\u65e0\u6cd5\u88ab\u8bbf\u95ee\uff0c\u5982\u679c\u6ee5\u7528\u4e0d\u540c\u8bcd\u6cd5\u57df\u53ef\u91cd\u540d\u7684\u7279\u6027\u7684\u8bdd\uff0c\u53ef\u80fd\u5bfc\u81f4\u7a0b\u5e8f\u5f88\u96be\u9605\u8bfb\u3002<\/p>\n<pre><code class=\"language-go\">package main\n\nimport \"fmt\"\n\nfunc main() {\nvar fmt int = 1111\nfmt.Println(\"hello\") \/\/ \u65e0\u6cd5\u6267\u884c\u6253\u5370\u529f\u80fd\uff0c\u56e0\u4e3a\u5185\u90e8\u7684fmt\u5c4f\u853d\u4e86\u5916\u90e8\n}<\/code><\/pre>\n<\/li>\n<\/ul>\n<h3>3.3 \u51fd\u6570\u76f8\u5173<\/h3>\n<ul>\n<li>\n<p>1 \u51fd\u6570\u6700\u5916\u5c42\u662f\u4ec0\u4e48\uff1f<\/p>\n<p>\u5728\u51fd\u6570\u4f53\u4e2d\uff0c\u51fd\u6570\u7684\u5f62\u53c2\u548c\u6709\u540d\u8fd4\u56de\u503c\u4f5c\u4e3a\u51fd\u6570\u6700\u5916\u5c42\u7684\u5c40\u90e8\u53d8\u91cf\uff0c\u88ab\u5b58\u50a8\u5728\u76f8\u540c\u7684\u8bcd\u6cd5\u5757\u4e2d\u3002<\/p>\n<pre><code class=\"language-go\">package main\n\nimport \"fmt\"\n\nfunc foo(x, y int) (z int) {\n\/\/ \u6700\u5916\u5c42\u76f8\u5f53\u4e8e\u58f0\u660e\u4e86\n\/\/ var x int = 111   \/\/ \u63a5\u6536\u5b9e\u53c2111\n\/\/ var y int = 222   \/\/ \u63a5\u6536\u5b9e\u53c2222\n\/\/ var z int         \/\/ \u521d\u59cb\u5316\u96f6\u503c\nfmt.Println(x, y, z) \/\/ \u8f93\u51fa\uff1a111 222 0\nz = x + y            \/\/ \u8d4b\u503c\u64cd\u4f5c,z\u88ab\u6539\u4e3a333\nreturn z\n}\n\nfunc main() {\nres:=foo(111, 222)\nfmt.Println(res)    \/\/ 333\n}<\/code><\/pre>\n<\/li>\n<li>\n<p>2 \u51fd\u6570\u4f53\u4fee\u6539\u5916\u90e8\u4f20\u5165\u7684\u503c<\/p>\n<p>\u5b9e\u53c2\u901a\u8fc7\u503c\u7684\u65b9\u5f0f\u4f20\u9012\uff0c\u56e0\u6b64\u51fd\u6570\u7684\u5f62\u53c2\u662f\u5b9e\u53c2\u7684\u62f7\u8d1d\u3002\u5728\u51fd\u6570\u5185\u5bf9\u503c\u7684\u4fee\u6539\u4e0d\u4f1a\u5f71\u54cd\u539f\u503c\u3002\u4f46\u662f\uff0c\u5982\u679c\u5b9e\u53c2\u5305\u62ec\u5f15\u7528\u7c7b\u578b\uff0c\u5982\u6307\u9488\uff0cslice(\u5207\u7247)\u3001map\u3001function\u3001channel\u7b49\u7c7b\u578b\uff0c\u5728\u51fd\u6570\u5185\u7684\u4fee\u6539\u4f1a\u5f71\u54cd\u539f\u503c<\/p>\n<\/li>\n<\/ul>\n<h3>3.4 \u5305\u7ea7\u4f5c\u7528\u57df\u4e0e\u58f0\u660e\u987a\u5e8f<\/h3>\n<p>\u5728\u5305\u7ea7\u522b\uff0c\u58f0\u660e\u7684\u987a\u5e8f\u5e76\u4e0d\u4f1a\u5f71\u54cd\u4f5c\u7528\u57df\u8303\u56f4\uff0c\u56e0\u6b64\u4e00\u4e2a\u5148\u58f0\u660e\u7684\u53ef\u4ee5\u5f15\u7528\u5b83\u81ea\u8eab\u6216\u8005\u662f\u5f15\u7528\u540e\u9762\u7684\u4e00\u4e2a\u58f0\u660e\uff0c\u8fd9\u53ef\u4ee5\u4e3a\u6211\u4eec\u5e26\u6765\u4e00\u4e9b\u989d\u5916\u7684\u6548\u679c<\/p>\n<ul>\n<li>\n<p>1\u3001\u6709\u540d\u51fd\u6570\u65e0\u9700\u5148\u5b9a\u4e49\u540e\u8c03\u7528<br \/>\n\u6709\u540d\u51fd\u6570\u5fc5\u987b\u58f0\u660e\u5728\u5305\u7ea7\uff0c\u5305\u7ea7\u58f0\u660e\u5728\u4f7f\u7528\u65f6\u65e0\u6240\u8c13\u987a\u5e8f\uff0c\u6240\u4ee5\u6709\u540d\u51fd\u6570\u4f7f\u7528\uff0c\u8ddf\u5b9a\u4e49\u4f4d\u7f6e\u65e0\u5173\uff0c\u53ea\u8981\u5b9a\u4e49\u4e86\uff0c\u5728\u4efb\u4f55\u4f4d\u7f6e\u90fd\u80fd\u7528\uff0c\u65e0\u9700\u5148\u5b9a\u4e49\u540e\u4f7f\u7528<\/p>\n<pre><code class=\"language-go\">import \"fmt\"\n\nfunc main() {\nsayHi()\n}\n\n\/\/ \u540e\u5b9a\u4e49\u7684\u51fd\u6570\nfunc sayHi() {\nfmt.Println(\"hello\")\n}<\/code><\/pre>\n<\/li>\n<li>\n<p>2\u3001\u5305\u7ea7\u58f0\u660e\u7684\u53d8\u91cf\uff0c\u5728\u540e\u9762\u5b9a\u4e49\uff0c\u4e5f\u53ef\u4ee5\u5f15\u7528<\/p>\n<pre><code class=\"language-go\">import \"fmt\"\n\nfunc main() {\nfmt.Println(name)\n}\n\n\/\/ \u540e\u5b9a\u4e49\u7684\u53d8\u91cf\nvar name = \"hello\"\n\n\/\/ \u4f46\u662f\u5982\u679c\u4e00\u4e2a\u53d8\u91cf\u6216\u5e38\u91cf\u9012\u5f52\u5f15\u7528\u4e86\u81ea\u8eab\uff0c\u5219\u4f1a\u4ea7\u751f\u7f16\u8bd1\u9519\u8bef\u3002\n\/\/ var x = x  \/\/ \u7f16\u8bd1\u9519\u8bef<\/code><\/pre>\n<p>\u5f3a\u8c03\uff1a\u5982\u679c\u6ca1\u6709\u5728\u5305\u7ea7\uff0c\u800c\u662f\u5728\u51fd\u6570\u5185\u90e8\uff0c\u53d8\u91cf\u80af\u5b9a\u662f\u8981\u5148\u5b9a\u4e49\u518d\u4f7f\u7528<\/p>\n<\/li>\n<\/ul>\n<h3>3.5 \u6ce8\u610f\u77ed\u53d8\u91cf\u58f0\u660e\u8bed\u53e5\u7684\u4f5c\u7528\u8303\u56f4<\/h3>\n<p>\u7b80\u77ed\u58f0\u660e\u4e0e\u8d4b\u503c\u7b26\u53f7\u5f88\u50cf\u5bf9\u4e0d\u5bf9\uff0c\u5f88\u5bb9\u6613\u641e\u6df7\uff0c\u6240\u4ee5\u8981\u7279\u522b\u6ce8\u610f\u77ed\u53d8\u91cf\u58f0\u660e\u8bed\u53e5\u7684\u4f5c\u7528\u57df\u8303\u56f4\u3002<\/p>\n<p>\u4f8b1\uff1a\u5c40\u90e8\u58f0\u660e\u7684\u91cd\u540d\u53d8\u91cf\u4f1a\u8986\u76d6\u5305\u7ea7\u7684<\/p>\n<pre><code class=\"language-go\">import &quot;fmt&quot;\n\nvar x int\n\nfunc main() {\n    x, y := 1, 2  \/\/ \u6b64\u5904\u662f\u58f0\u660e\u8bed\u53e5\uff0c\u5728\u5c40\u90e8\u58f0\u660e\u4e86\u4e00\u4e2a\u53d8\u91cfx\uff0c\u8986\u76d6\u4e86\u5305\n    fmt.Println(x, y)\n} <\/code><\/pre>\n<p>\u4f8b2\uff1a\u82e5\u60f3\u4fee\u6539\u5305\u7ea7\u53d8\u91cf\u503c\uff0c\u9700\u8981\u8fd9\u4e48\u505a<\/p>\n<pre><code class=\"language-go\">package main\n\nimport &quot;fmt&quot;\n\nvar x int\n\nfunc main() {\n    var y int\n    x, y = 1, 2 \/\/ \u6b64\u5904\u662f\u8d4b\u503c\u8bed\u53e5\n    fmt.Println(x, y)\n}<\/code><\/pre>\n<p>\u4e0a\u8ff0\u4e24\u4e2a\u4f8b\u5b50\u770b\u4f3c\u7b80\u5355\uff0c\u5374\u662f\u5728\u6559\u4f60\u89e3\u51b3\u4e00\u4e2a\u975e\u5e38\u9690\u6666\u7684bug<\/p>\n<p>\u8003\u8651\u4e0b\u9762\u7684\u7a0b\u5e8f\uff1a<\/p>\n<pre><code class=\"language-go\">\/\/ \u83b7\u53d6\u5f53\u524d\u7684\u5de5\u4f5c\u76ee\u5f55\u7136\u540e\u4fdd\u5b58\u5230\u4e00\u4e2a\u5305\u7ea7\u7684\u53d8\u91cf\u4e2d\u3002\u8fd9\u53ef\u4ee5\u672c\u6765\u53ef\u4ee5\u5728\u5305\u7ea7\u76f4\u63a5\u8c03\u7528os.Getwd\u5b8c\u6210\uff0c\u4f46\u662f\u5c06\u8fd9\u4e2a\u4ece\u4e3b\u903b\u8f91\u4e2d\u5206\u79bb\u51fa\u6765\u653e\u5230\u4e00\u4e2a\u5355\u72ec\u7684\u51fd\u6570\u5185\u53ef\u80fd\u4f1a\u66f4\u597d(\u7279\u522b\u662f\u5728\u9700\u8981\u5904\u7406\u9519\u8bef\u7684\u65f6\u5019)\uff0c\u4e8e\u662f\u6211\u4eec\u7f16\u5199\u4e86\u4e0b\u8ff0\u4ee3\u7801\nvar cwd string  \/\/ \u5305\u7ea7\u53d8\u91cf\n\nfunc init() {\n    cwd, err := os.Getwd() \/\/ \u6b64\u5904\u662f\u58f0\u660e\u8bed\u53e5\uff0c\u7f16\u8bd1\u9519\u8bef\uff1acwd declared but not used\n    if err != nil {\n        log.Fatalf(&quot;os.Getwd failed: %v&quot;, err)\n    }\n}<\/code><\/pre>\n<p>\u89e3\u6790\uff1a<\/p>\n<p>\u867d\u7136cwd\u5728\u5916\u90e8\u7684\u5305\u7ea7\u5df2\u7ecf\u58f0\u660e\u8fc7\uff0c\u4f46\u662f<code>:=<\/code>\u8bed\u53e5\u8fd8\u662f\u5c06cwd\u548cerr\u91cd\u65b0\u58f0\u660e\u4e3a\u65b0\u7684\u5c40\u90e8\u53d8\u91cf\u3002\u56e0\u4e3a\u5185\u90e8\u58f0\u660e\u7684cwd\u5c06\u5c4f\u853d\u5916\u90e8\u7684\u58f0\u660e\uff0c\u56e0\u6b64\u4e0a\u9762\u7684\u4ee3\u7801\u5e76\u4e0d\u4f1a\u6b63\u786e\u66f4\u65b0\u5305\u7ea7\u58f0\u660e\u7684cwd\u53d8\u91cf\u3002<\/p>\n<p>\u7531\u4e8e\u5f53\u524d\u7684\u7f16\u8bd1\u5668\u4f1a\u68c0\u6d4b\u5230\u5c40\u90e8\u58f0\u660e\u7684cwd\u5e76\u6ca1\u6709\u672c\u4f7f\u7528\uff0c\u7136\u540e\u62a5\u544a\u8fd9\u53ef\u80fd\u662f\u4e00\u4e2a\u9519\u8bef\uff0c\u4f46\u662f\u8fd9\u79cd\u68c0\u6d4b\u5e76\u4e0d\u53ef\u9760\u3002\u56e0\u4e3a\u4e00\u4e9b\u5c0f\u7684\u4ee3\u7801\u53d8\u66f4\uff0c\u4f8b\u5982\u589e\u52a0\u4e00\u4e2a\u5c40\u90e8cwd\u7684\u6253\u5370\u8bed\u53e5\uff0c\u5c31\u53ef\u80fd\u5bfc\u81f4\u8fd9\u79cd\u68c0\u6d4b\u5931\u6548\u3002<\/p>\n<pre><code class=\"language-go\">var cwd string\n\nfunc init() {\n    cwd, err := os.Getwd() \/\/ \u6b64\u65f6\u662f\u58f0\u660e\u8bed\u53e5\uff0ccompile error: unused: cwd\n    if err != nil {\n        log.Fatalf(&quot;os.Getwd failed: %v&quot;, err)\n    }\n    log.Printf(&quot;Working directory = %s&quot;, cwd)\n}<\/code><\/pre>\n<p>\u4f46\u6b64\u65f6\u5168\u5c40\u7684cwd\u53d8\u91cf\u4f9d\u7136\u662f\u6ca1\u6709\u88ab\u6b63\u786e\u521d\u59cb\u5316\u7684\uff0c\u800c\u4e14\u770b\u4f3c\u6b63\u5e38\u7684\u65e5\u5fd7\u8f93\u51fa\u66f4\u662f\u8ba9\u8fd9\u4e2aBUG\u66f4\u52a0\u9690\u6666\u3002<\/p>\n<p>\u6709\u8bb8\u591a\u65b9\u5f0f\u53ef\u4ee5\u907f\u514d\u51fa\u73b0\u7c7b\u4f3c\u6f5c\u5728\u7684\u95ee\u9898\u3002\u6700\u76f4\u63a5\u7684\u65b9\u6cd5\u662f\u901a\u8fc7\u5355\u72ec\u58f0\u660eerr\u53d8\u91cf\uff0c\u6765\u907f\u514d\u4f7f\u7528<code>:=<\/code>\u7684\u7b80\u77ed\u58f0\u660e\u65b9\u5f0f\uff1a<\/p>\n<pre><code class=\"language-go\">var cwd string\n\nfunc init() {\n    var err error\n    cwd, err = os.Getwd()  \/\/ \u6b64\u65f6\u5c31\u5b8c\u5168\u6210\u4e86\u8d4b\u503c\u8bed\u53e5\uff0c\u5c31\u662f\u66f4\u65b0\u4e86\u5305\u7ea7\u7684cwd\n    if err != nil {\n        log.Fatalf(&quot;os.Getwd failed: %v&quot;, err)\n    }\n}<\/code><\/pre>\n<h3>3.6 if\u7684\u5b50\u5206\u652f<\/h3>\n<p>\u548cfor\u5faa\u73af\u7c7b\u4f3c\uff0cif\u8bed\u53e5\u4e5f\u4f1a\u5728\u6761\u4ef6\u90e8\u5206\u521b\u5efa\u9690\u5f0f\u8bcd\u6cd5\u57df\uff0c\u8fd8\u6709\u5b83\u4eec\u5bf9\u5e94\u7684\u6267\u884c\u4f53\u8bcd\u6cd5\u57df\u3002<\/p>\n<p>\u4f46\u662f\u4e0efor\u5faa\u73af\u4e0d\u540c\u7684\u662f\uff0cif\u53ef\u4ee5\u6709\u591a\u4e2a\u5b50\u5206\u652f\uff0c\u800c\u4e14\u591a\u4e2a\u5b50\u5206\u652f\u76f8\u5f53\u4e8e\u5c42\u5c42\u5d4c\u5957\u5173\u7cfb\uff1a\u6700\u5f00\u59cb\u7684if\u58f0\u660e\u8bed\u53e5\u5c5e\u4e8e\u9876\u7ea7\u5305\u542b\u5728\u6574\u4e2a\u5224\u65ad\u8bed\u53e5\u7684\u6700\u5916\u5c42\uff0c\u5206\u652f\u8bed\u53e5\u90fd\u5c5e\u4e8e\u5176\u5b50\u7ea7\uff0c\u5373if\u91cc\u5957\u4e86else if\uff0celse if\u91cc\u5957\u4e86else if\u3002\u3002\u3002\u5957\u5728\u6700\u91cc\u5c42\u7684\u662felse<\/p>\n<p>\u9605\u8bfb\u4e0b\u8ff0\u4ee3\u7801\uff0c\u5224\u65ad\u7ed3\u679c<\/p>\n<pre><code class=\"language-go\">package main\n\nimport &quot;fmt&quot;\n\nfunc main() {\n    var name string\n    fmt.Print(&quot;\u8bf7\u8f93\u5165\u540d\u5b57:&quot;)\n    fmt.Scanln(&amp;name)\n\n    if x := name; x == &quot;bigegon&quot; { \/\/ \u9996\u5148\u53ef\u4ee5\u8bbf\u95ee\u5916\u5c42\u7684name\uff0c\u7136\u540e\u6b64\u5904\u7684x\u58f0\u660e\u5c5e\u4e8eif\u6700\u5916\u5c42\n        fmt.Println(&quot;===&gt;&quot;,x)\n    } else if y := &quot;smallegonn&quot;; x == y { \/\/ \u53ef\u4ee5\u8bbf\u95ee\u5916\u5c42\u7684x\n        fmt.Println(&quot;---&gt;&quot;, y,x)\n    } else if z := 1; z &gt; 100 {\/\/\u4e0a\u8ff0\u6761\u4ef6\u90fd\u4e0d\u6210\u7acb\u4f1a\u6267\u884c\u8be5\u5206\u652f\uff0c\u867d\u7136\u8be5\u5206\u652f\u6761\u4ef6\u4e0d\u6210\u7acb\uff0c\u4f46\u80af\u5b9a\u662f\u58f0\u660e\u4e86z\n        fmt.Printf(&quot;+++&gt;&quot;)\n    } else {\n        fmt.Println(&quot;...&gt;&quot;,x, y, z) \/\/ \u53ef\u4ee5\u8bbf\u95eex\uff0cy\uff0cz\n    }\n    \/\/fmt.Println(x, y, z) \/\/ \u65e0\u6cd5\u8bbf\u95eex\uff0cy\uff0cz\n}<\/code><\/pre>\n<p>\u61c2\u4e86\u4e0a\u4f8b\u4e4b\u540e\uff0c\u6211\u4eec\u518d\u6765\u770b\u4e00\u4e2a\u4f8b\u5b50<\/p>\n<pre><code class=\"language-Go\">if f, err := os.Open(fname); err != nil { \/\/ compile error: unused: f\n    return err\n}\nf.ReadByte() \/\/ compile error: undefined f\nf.Close()    \/\/ compile error: undefined f\n\n\/\/ \u53d8\u91cff\u7684\u4f5c\u7528\u57df\u53ea\u6709\u5728if\u8bed\u53e5\u5185\uff0c\u56e0\u6b64\u540e\u9762\u7684\u8bed\u53e5\u5c06\u65e0\u6cd5\u5f15\u5165\u5b83\uff0c\u8fd9\u5c06\u5bfc\u81f4\u7f16\u8bd1\u9519\u8bef<\/code><\/pre>\n<p>\u901a\u5e38\u9700\u8981\u5728if\u4e4b\u524d\u58f0\u660e\u53d8\u91cf\uff0c\u8fd9\u6837\u53ef\u4ee5\u786e\u4fdd\u540e\u9762\u7684\u8bed\u53e5\u4f9d\u7136\u53ef\u4ee5\u8bbf\u95ee\u53d8\u91cf\uff1a<\/p>\n<pre><code class=\"language-Go\">f, err := os.Open(fname)\nif err != nil {\n    return err\n}\nf.ReadByte()\nf.Close()<\/code><\/pre>\n<p>\u4f60\u53ef\u80fd\u4f1a\u8003\u8651\u901a\u8fc7\u5c06ReadByte\u548cClose\u79fb\u52a8\u5230if\u7684else\u5757\u6765\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff1a<\/p>\n<pre><code class=\"language-Go\">if f, err := os.Open(fname); err != nil {\n    return err\n} else {\n    \/\/ f and err are visible here too\n    f.ReadByte()\n    f.Close()\n}<\/code><\/pre>\n<p>\u4f46\u8fd9\u4e0d\u662fGo\u8bed\u8a00\u63a8\u8350\u7684\u505a\u6cd5\uff0cGo\u8bed\u8a00\u7684\u4e60\u60ef\u662f\u5728if\u4e2d\u5904\u7406\u9519\u8bef\u7136\u540e\u76f4\u63a5\u8fd4\u56de\uff0c\u8fd9\u6837\u53ef\u4ee5\u786e\u4fdd\u6b63\u5e38\u6267\u884c\u7684\u8bed\u53e5\u4e0d\u9700\u8981\u4ee3\u7801\u7f29\u8fdb\u3002<\/p>\n<h3>3.7 switch\u7684\u5b50\u5206\u652f<\/h3>\n<p>switch\u7684\u5b50\u5206\u652f\u4e0eif\u7c7b\u4f3c\u7684\u662f\uff0c\u6bcf\u4e2a\u5b50\u5757\u90fd\u6709\u81ea\u5df1\u7684\u4f5c\u7528\u57df\uff1a\u6761\u4ef6\u90e8\u5206\u4e3a\u4e00\u4e2a\u9690\u5f0f\u8bcd\u6cd5\u57df\uff0c\u7136\u540e\u6bcf\u4e2a\u662f\u6bcf\u4e2a\u5206\u652f\u7684\u8bcd\u6cd5\u57df\u3002\u4e0d\u540c\u7684\u662f\uff0c\u5b50\u5757\u5f7c\u6b64\u72ec\u7acb<\/p>\n<pre><code class=\"language-go\">package main\n\nimport &quot;fmt&quot;\n\nfunc main() {\n    m := 10\n    switch m := 20; { \/\/ \u9690\u5f0f\u7684\u8bcd\u6cd5\u57df\uff0c\u672b\u5c3e\u5fc5\u987b\u52a0\u5206\u53f7\n    case m &gt; 19:\n        var xxx = 111\n        fmt.Println(xxx)\n        \/\/fallthrough\n    case m &gt; 29:\n        var yyy = 222\n        fmt.Println(yyy)\n        \/\/fallthrough\n    case m &gt; 39:\n        var zzz = 333\n        fmt.Println(zzz)\n        \/\/fallthrough\n    default:\n        fmt.Println(&quot;===&gt;&quot;)\n        \/\/fmt.Println(xxx, yyy, zzz)  \/\/ \u6253\u5f00\u6240\u6709\u7684fallthrough\uff0c\u4e5f\u65e0\u6cd5\u8bbf\u95eexxx\u3001yyy\n    }\n\n    fmt.Println(m) \/\/ \u8f93\u51fa10\n}<\/code><\/pre>\n<h2>\u56db \u7ec3\u4e60<\/h2>\n<p>\u7ec3\u4e601\uff1a\u4e0b\u8ff0\u4ee3\u7801\u7ed3\u679c\u4e3a\uff1f<\/p>\n<pre><code class=\"language-go\">var x int = 111\n\nfunc main() {\n    x=3333\n    say()\n}\n\nfunc say() {\n    fmt.Println(x)\n}<\/code><\/pre>\n<p>\u7ec3\u4e602\uff1a\u4e0b\u8ff0\u4ee3\u7801\u7ed3\u679c\u4e3a\uff1f<\/p>\n<pre><code class=\"language-go\">var x int = 111\n\nfunc main() {\n    x:=222\n    {\n        x:=333\n        {\n            x:=444\n            fmt.Println(x)\n        }\n        fmt.Println(x)\n    }\n    fmt.Println(x)\n\n    say()\n}\n\nfunc say() {\n    fmt.Println(x)\n}<\/code><\/pre>\n<p>3\u3001\u4e0b\u8ff0\u4e09\u4e2ax\u662f\u5426\u4f1a\u51b2\u7a81\uff0c\u8bf7\u8bf4\u660e\u539f\u56e0<\/p>\n<pre><code class=\"language-go\">func main() {\n    x := &quot;hello&quot;  \n    for _, x := range x { \n        x := x + (&#039;A&#039; - &#039;a&#039;)\n        fmt.Printf(&quot;%c&quot;, x) \n    }\n}\n\n\u89e3\u6790\uff1a\n\u4f8b\u5b50\u6709\u4e09\u4e2a\u4e0d\u540c\u7684x\u53d8\u91cf\uff0c\u6bcf\u4e2a\u58f0\u660e\u5728\u4e0d\u540c\u7684\u8bcd\u6cd5\u57df\uff0c\u4e00\u4e2a\u5728\u51fd\u6570\u4f53\u8bcd\u6cd5\u57df\uff0c\u4e00\u4e2a\u5728for\u9690\u5f0f\u7684\u521d\u59cb\u5316\u8bcd\u6cd5\u57df\uff0c\u4e00\u4e2a\u5728for\u5faa\u73af\u4f53\u8bcd\u6cd5\u57df\nfunc main() {\n    x := &quot;hello&quot;  \/\/ 1\u3001\u51fd\u6570\u4f53\u8bcd\u6cd5\u57df=&gt;\u663e\u5f0f\u7684\n    for _, x := range x {  \/\/ 2\u3001\u672c\u884c\u4ee3\u7801\u662f\u521d\u59cb\u5316\u8bcd\u6cd5\u57df=&gt;\u9690\u5f0f\u7684\n        \/\/ 3\u3001\u6b64\u5904\u662f\u5faa\u73af\u4f53\u8bcd\u6cd5\u57df=&gt;\u663e\u5f0f\u7684\n        x := x + (&#039;A&#039; - &#039;a&#039;) \/\/ &#039;A&#039; - &#039;a&#039;\u4e3a\u5927\u5199\u5b57\u6bcd\u4e0e\u5c0f\u5199\u5b57\u6bcd\u7684\u5dee\u503c\uff0c&#039;B&#039; - &#039;b&#039;\u4e5f\u4e00\u6837\uff0c\u8be5\u884c\u4ee3\u7801\u7684\u76ee\u7684\u662f\u628a\u5b57\u6bcd\u52a0\u4e0a\u4e00\u5b9a\u7684\u504f\u79fb\u91cf\uff0c\u53d8\u4e3a\u5bf9\u5e94\u7684\u5927\u5199\u5b57\u6bcd\n        fmt.Printf(&quot;%c&quot;, x) \/\/ &quot;HELLO&quot;\n    }\n}<\/code><\/pre>\n<p>4\u3001\u4e0b\u8ff0\u51fd\u6570\u6253\u5370\u7ed3\u679c\u662f\u4ec0\u4e48\uff1f<\/p>\n<pre><code class=\"language-go\">package main\n\nimport &quot;fmt&quot;\n\nvar x int = 111\n\nfunc f1() {\n    fmt.Println(&quot;\u5728f1\u5185\u8bbf\u95eex\uff1a&quot;,x)\n    var x int = 222\n    func() { fmt.Println(&quot;\u5728f1\u7684\u5b50\u51fd\u6570\u5185\u8bbf\u95eex\uff1a&quot;,x) }()\n}\n\nfunc main() {\n    x := 333\n    f1()\n\n    fmt.Println(&quot;\u5728main\u4e2d\u8bbf\u95eex\uff1a&quot;,x)\n}<\/code><\/pre>\n<h2>\u4e94 \u533f\u540d\u51fd\u6570\u548c\u95ed\u5305<\/h2>\n<h3>5.1 \u533f\u540d\u51fd\u6570<\/h3>\n<p>\u533f\u540d\u51fd\u6570\u5c31\u662f\u6ca1\u6709\u540d\u5b57\u7684\u51fd\u6570\uff0c\u7528\u4e8e\u4e34\u65f6\u4f7f\u7528\u4e00\u6b21\u7684\u573a\u666f<\/p>\n<pre><code class=\"language-go\">func(\u53c2\u6570)(\u8fd4\u56de\u503c){\n    \u51fd\u6570\u4f53\n}<\/code><\/pre>\n<p>\u533f\u540d\u51fd\u6570\u56e0\u4e3a\u6ca1\u6709\u51fd\u6570\u540d\uff0c\u6240\u4ee5\u6ca1\u529e\u6cd5\u50cf\u666e\u901a\u51fd\u6570\u90a3\u6837\u8c03\u7528\uff0c\u533f\u540d\u51fd\u6570\u9700\u8981\u4fdd\u5b58\u5230\u67d0\u4e2a\u53d8\u91cf\u6216\u8005\u4f5c\u4e3a\u7acb\u5373\u6267\u884c\u51fd\u6570:<\/p>\n<pre><code class=\"language-go\">func main() {\n    \/\/ \u5c06\u533f\u540d\u51fd\u6570\u4fdd\u5b58\u5230\u53d8\u91cf\n    add := func(x, y int) {\n        fmt.Println(x + y)\n    }\n    add(10, 20) \/\/ \u901a\u8fc7\u53d8\u91cf\u8c03\u7528\u533f\u540d\u51fd\u6570\n\n    \/\/\u81ea\u6267\u884c\u51fd\u6570\uff1a\u533f\u540d\u51fd\u6570\u5b9a\u4e49\u5b8c\u52a0()\u76f4\u63a5\u6267\u884c\n    func(x, y int) {\n        fmt.Println(x + y)\n    }(10, 20)\n}<\/code><\/pre>\n<p>\u533f\u540d\u51fd\u6570\u591a\u7528\u4e8e\u5b9e\u73b0\u56de\u8c03\u51fd\u6570\u548c\u95ed\u5305\u3002<\/p>\n<h3>5.2 \u95ed\u5305<\/h3>\n<p>\u95ed\u5305\u51fd\u6570=\u95ed\u51fd\u6570+\u5305\u51fd\u6570<\/p>\n<p>\u95ed\uff1a\u6307\u7684\u662f\u5b9a\u4e49\u5728\u51fd\u6570\u5185\u90e8\u7684\u51fd\u6570\uff0c\u6ce8\u610f\uff0c\u5728Go\u8bed\u8a00\u4e2d\uff0c\u5b9a\u4e49\u5728\u51fd\u6570\u5185\u90e8\u7684\u51fd\u6570\u5fc5\u987b\u662f\u533f\u540d\u51fd\u6570<\/p>\n<p>\u5305\uff1a\u95ed\u51fd\u6570\u5305\u542b\u4e86\u5bf9\u5916\u5c42\u51fd\u6570\u540d\u5b57\u7684\u5f15\u7528<\/p>\n<pre><code class=\"language-go\">func counter(start int) func(int) int{\n    f:= func(n int) int{\n        start += n  \/\/ \u4fee\u6539\u5916\u5c42\u51fd\u6570\u7684\u53d8\u91cfstart\n        return start\n    }\n    return f\n}\n\nfunc main() {\n    c:=counter(0)\n    fmt.Println(c(1)) \/\/ 1\n    fmt.Println(c(1)) \/\/ 2\n    fmt.Println(c(1)) \/\/ 3\n}<\/code><\/pre>\n<p>\u95ed\u5305\u5e94\u7528\u793a\u4f8b1<\/p>\n<pre><code class=\"language-go\">func makeSuffixFunc(suffix string) func(string) string {\n    return func(name string) string {\n        if !strings.HasSuffix(name, suffix) {\n            return name + suffix\n        }\n        return name\n    }\n}\n\nfunc main() {\n    jpgFunc := makeSuffixFunc(&quot;.jpg&quot;)\n    txtFunc := makeSuffixFunc(&quot;.txt&quot;)\n    fmt.Println(jpgFunc(&quot;test&quot;)) \/\/test.jpg\n    fmt.Println(txtFunc(&quot;test&quot;)) \/\/test.txt\n}<\/code><\/pre>\n<p>\u95ed\u5305\u5e94\u7528\u793a\u4f8b2<\/p>\n<pre><code class=\"language-go\">func circle(radius float64) (func(), func()) {\n    perimeter := func() {\n        fmt.Println(&quot;\u5468\u957f\u662f\uff1a&quot;,2 * math.Pi * radius)\n    }\n    area := func() {\n        fmt.Println(&quot;\u9762\u79ef\u662f\uff1a&quot;,math.Pi * (radius * radius))\n    }\n    return perimeter, area\n}\n\nfunc main() {\n    f1,f2 := circle(3.3)\n    f1()  \/\/ \u5468\u957f\u662f\uff1a 20.734511513692635\n    f2()  \/\/ \u9762\u79ef\u662f\uff1a 34.21194399759284\n}<\/code><\/pre>\n<p>\u7ec3\u4e60\uff1a<\/p>\n<pre><code class=\"language-go\">v := &quot;outer&quot;\nfmt.Println(v)\n{\n    v := &quot;inner&quot;\n    fmt.Println(v)\n    {\n        fmt.Println(v)\n    }\n}\n{\n    fmt.Println(v)\n}\nfmt.Println(v)\n\n\u8f93\u51fa\uff1a\nouter\ninner\ninner\nouter\nouter<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u4f5c\u7528\u57df \u4f5c\u7528\u57df\u5e76\u975e\u51fd\u6570\u7684\u5b50\u77e5\u8bc6\u70b9\uff0c\u4e4b\u6240\u4ee5\u5728\u6b64\u5904\u4ecb\u7ecd\uff0c\u662f\u56e0\u4e3a\u5728\u5b66\u4e60\u5b8c\u51fd\u6570\u57fa\u672c\u4f7f\u7528\u540e\uff0c\u6211\u4eec\u624d\u53ef\u4ee5\u6210\u4f53\u7cfb\u4ecb\u7ecd\u5b83 \u4e00  [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[4,450],"tags":[],"_links":{"self":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/7944"}],"collection":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7944"}],"version-history":[{"count":0,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/7944\/revisions"}],"wp:attachment":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7944"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7944"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7944"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}