{"id":299991,"date":"2024-05-20T17:31:13","date_gmt":"2024-05-20T09:31:13","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/299991.html"},"modified":"2024-05-20T17:31:27","modified_gmt":"2024-05-20T09:31:27","slug":"go-%e7%9a%84-switch-%e8%af%ad%e5%8f%a5%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95%e6%98%af%e4%bb%80%e4%b9%88","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/299991.html","title":{"rendered":"Go \u7684 switch \u8bed\u53e5\u4f7f\u7528\u65b9\u6cd5\u662f\u4ec0\u4e48"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/26210745\/7909cc5a-e375-4ce6-98d7-f8031638c02e.webp\" alt=\"Go \u7684 switch \u8bed\u53e5\u4f7f\u7528\u65b9\u6cd5\u662f\u4ec0\u4e48\" \/><\/p>\n<p><p>Go\u7684switch\u8bed\u53e5\u662f\u4e00\u79cd\u6761\u4ef6\u8bed\u53e5\uff0c\u5b83\u5141\u8bb8\u57fa\u4e8e\u4e0d\u540c\u7684\u6761\u4ef6\u6267\u884c\u4e0d\u540c\u7684\u4ee3\u7801\u5757\u3002\u5b83\u4e3b\u8981\u7528\u4e8e\u53d6\u4ee3\u591a\u4e2aif&#8230;else\u8bed\u53e5\uff0c\u4ee5\u5b9e\u73b0\u66f4\u6e05\u6670\u3001\u66f4\u6613\u7ef4\u62a4\u7684\u4ee3\u7801\u3002\u5f53\u7a0b\u5e8f\u9700\u8981\u5bf9\u4e00\u4e2a\u8868\u8fbe\u5f0f\u7684\u591a\u4e2a\u6f5c\u5728\u503c\u6267\u884c\u4e0d\u540c\u64cd\u4f5c\u65f6\uff0c\u4f7f\u7528switch\u8bed\u53e5\u662f\u975e\u5e38\u9ad8\u6548\u7684\u3002<strong>Switch\u8bed\u53e5\u68c0\u67e5\u4e00\u4e2a\u503c\u4e0e\u4e00\u7cfb\u5217\u53ef\u80fd\u7684\u5339\u914d\u60c5\u51b5\uff0c\u5e76\u6267\u884c\u4e0e\u8be5\u503c\u5bf9\u5e94\u7684\u4ee3\u7801\u5757\u3001\u63d0\u4f9b\u4e00\u4e2adefault\u5206\u652f\u4ee5\u5904\u7406\u672a\u5339\u914d\u5230\u4efb\u4f55\u60c5\u51b5\u4e0b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u3002<\/strong><\/p>\n<\/p>\n<p><h3>\u4e00\u3001SWITCH \u8bed\u53e5\u7684\u57fa\u672c\u7ed3\u6784<\/h3>\n<\/p>\n<p><p><strong>Switch\u8bed\u53e5<\/strong>\u7684\u57fa\u672c\u5f62\u5f0f\u662f\u68c0\u67e5\u4e00\u4e2a\u53d8\u91cf\u6216\u8868\u8fbe\u5f0f\u7684\u503c\uff0c\u5e76\u5c06\u5176\u4e0e\u4e00\u7cfb\u5217case\u8bed\u53e5\u4e2d\u5b9a\u4e49\u7684\u503c\u8fdb\u884c\u6bd4\u8f83\u3002\u5982\u679c\u627e\u5230\u5339\u914d\uff0c\u76f8\u5e94\u7684\u4ee3\u7801\u5757\u5c31\u4f1a\u88ab\u6267\u884c\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-go\">switch \u8868\u8fbe\u5f0f {<\/p>\n<p>case \u503c1:<\/p>\n<p>    \/\/ \u5f53\u8868\u8fbe\u5f0f\u7b49\u4e8e\u503c1\u65f6\u6267\u884c<\/p>\n<p>case \u503c2:<\/p>\n<p>    \/\/ \u5f53\u8868\u8fbe\u5f0f\u7b49\u4e8e\u503c2\u65f6\u6267\u884c<\/p>\n<p>default:<\/p>\n<p>    \/\/ \u5982\u679c\u6ca1\u6709\u5339\u914d\uff0c\u6267\u884c\u8fd9\u91cc\u7684\u4ee3\u7801<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e8c\u3001SWITCH \u8bed\u53e5\u7684\u9ad8\u7ea7\u7528\u6cd5<\/h3>\n<\/p>\n<p><p><strong>Go<\/strong> \u7684switch\u8bed\u53e5\u4e0d\u4ec5\u652f\u6301\u7b80\u5355\u7684\u503c\u5339\u914d\uff0c\u8fd8\u652f\u6301\u7c7b\u578b\u5339\u914d\u3001\u590d\u6742\u8868\u8fbe\u5f0f\u7684\u5339\u914d\u7b49\u9ad8\u7ea7\u7528\u6cd5\u3002<\/p>\n<\/p>\n<p><h4>1. \u7c7b\u578b\u5206\u652f (Type Switch)<\/h4>\n<\/p>\n<p><p>\u7c7b\u578b\u5206\u652f\u5141\u8bb8\u4f60\u6bd4\u8f83\u63a5\u53e3\u53d8\u91cf\u7684\u52a8\u6001\u7c7b\u578b\u3002\u8fd9\u5728\u4f60\u9700\u8981\u6839\u636e\u53d8\u91cf\u7684\u5177\u4f53\u7c7b\u578b\u6267\u884c\u4e0d\u540c\u64cd\u4f5c\u65f6\u975e\u5e38\u6709\u7528\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-go\">switch x := x.(type) {<\/p>\n<p>case \u7c7b\u578b1:<\/p>\n<p>    \/\/ x \u662f \u7c7b\u578b1<\/p>\n<p>case \u7c7b\u578b2:<\/p>\n<p>    \/\/ x \u662f \u7c7b\u578b2<\/p>\n<p>default:<\/p>\n<p>    \/\/ x \u4e0d\u662f\u4efb\u4f55\u5339\u914d\u7684\u7c7b\u578b<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2. \u8868\u8fbe\u5f0f\u6bd4\u8f83<\/h4>\n<\/p>\n<p><p>\u8868\u8fbe\u5f0f\u6bd4\u8f83\u662f\u5728case\u8bed\u53e5\u4e2d\u4f7f\u7528\u8868\u8fbe\u5f0f\u800c\u4e0d\u4ec5\u4ec5\u662f\u5e38\u91cf\u503c\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-go\">switch {<\/p>\n<p>case \u8868\u8fbe\u5f0f1:<\/p>\n<p>    \/\/ \u6761\u4ef6\u8868\u8fbe\u5f0f1\u4e3a\u771f\u65f6\u6267\u884c<\/p>\n<p>case \u8868\u8fbe\u5f0f2:<\/p>\n<p>    \/\/ \u6761\u4ef6\u8868\u8fbe\u5f0f2\u4e3a\u771f\u65f6\u6267\u884c<\/p>\n<p>default:<\/p>\n<p>    \/\/ \u5982\u679c\u6ca1\u6709\u6761\u4ef6\u4e3a\u771f\uff0c\u6267\u884c\u8fd9\u91cc\u7684\u4ee3\u7801<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e09\u3001FALLTHROUGH \u8bed\u53e5<\/h3>\n<\/p>\n<p><p>Go\u7684switch\u8bed\u53e5\u9ed8\u8ba4\u5728\u6bcf\u4e2acase\u5206\u652f\u7ed3\u675f\u65f6break\uff0c\u4e0d\u4f1a\u81ea\u52a8\u6267\u884c\u540e\u7eed\u7684case\u5757\u3002\u4f46\u4f60\u53ef\u4ee5\u4f7f\u7528<strong>fallthrough<\/strong>\u5173\u952e\u5b57\u5f3a\u5236\u6267\u884c\u7d27\u8ddf\u7684\u4e0b\u4e00\u4e2acase\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-go\">switch \u8868\u8fbe\u5f0f {<\/p>\n<p>case \u503c1:<\/p>\n<p>    \/\/ \u6267\u884c\u4ee3\u7801<\/p>\n<p>    fallthrough<\/p>\n<p>case \u503c2:<\/p>\n<p>    \/\/ \u5373\u4f7f\u503c\u4e0d\u7b49\u4e8e\u503c2\u4e5f\u4f1a\u6267\u884c\u8fd9\u91cc\u7684\u4ee3\u7801<\/p>\n<p>default:<\/p>\n<p>    \/\/ \u9ed8\u8ba4\u6267\u884c\u5757<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u56db\u3001\u4f7f\u7528 SWITCH \u8bed\u53e5\u6bd4\u8f83\u591a\u4e2a\u503c<\/h3>\n<\/p>\n<p><p><strong>Switch\u8bed\u53e5<\/strong>\u4e5f\u53ef\u4ee5\u5728\u4e00\u4e2acase\u4e2d\u6bd4\u8f83\u591a\u4e2a\u503c\uff0c\u5bf9\u5e94\u591a\u79cd\u53ef\u80fd\u7684\u5339\u914d\u60c5\u51b5\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-go\">switch \u8868\u8fbe\u5f0f {<\/p>\n<p>case \u503c1, \u503c2, \u503c3:<\/p>\n<p>    \/\/ \u5982\u679c\u8868\u8fbe\u5f0f\u7b49\u4e8e\u503c1\u3001\u503c2\u6216\u503c3\u65f6\u6267\u884c<\/p>\n<p>default:<\/p>\n<p>    \/\/ \u5982\u679c\u6ca1\u6709\u5339\u914d\uff0c\u6267\u884c\u8fd9\u91cc\u7684\u4ee3\u7801<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e94\u3001\u63a7\u5236\u6d41\u6807\u7b7e\u4ee5\u53caBREAK\u8bed\u53e5<\/h3>\n<\/p>\n<p><p>\u5728\u590d\u6742\u7684\u63a7\u5236\u6d41\u4e2d\uff0c\u5c24\u5176\u662f\u5d4c\u5957\u7684switch\u6216\u5faa\u73af\u5185\uff0c<strong>break<\/strong>\u8bed\u53e5\u53ef\u4ee5\u4e0e\u6807\u7b7e\u914d\u5408\u4f7f\u7528\uff0c\u76f4\u63a5\u8df3\u51fa\u5230\u6307\u5b9a\u6807\u7b7e\u7684\u4f4d\u7f6e\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-go\">OuterLoop:<\/p>\n<p>for i := 0; i &lt; 3; i++ {<\/p>\n<p>    switch i {<\/p>\n<p>    case 1:<\/p>\n<p>        break OuterLoop<\/p>\n<p>    }<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u516d\u3001SWITCH \u8bed\u53e5\u7684\u5b9e\u7528\u573a\u666f<\/h3>\n<\/p>\n<p><p><strong>Switch\u8bed\u53e5<\/strong>\u5728Go\u4e2d\u88ab\u5e7f\u6cdb\u7528\u4e8e\u6839\u636e\u4e0d\u540c\u7c7b\u578b\u7684\u8f93\u5165\u6267\u884c\u4e0d\u540c\u7684\u4ee3\u7801\u903b\u8f91\u3002\u4e00\u4e9b\u5e38\u89c1\u7684\u4f7f\u7528\u573a\u666f\u5305\u62ec\u5904\u7406\u547d\u4ee4\u884c\u53c2\u6570\u3001\u8def\u7531HTTP\u8bf7\u6c42\u3001\u89e3\u6790\u4e0d\u540c\u7c7b\u578b\u7684\u6d88\u606f\u7b49\u3002<\/p>\n<\/p>\n<p><p>\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u4f7f\u7528switch\u8bed\u53e5\u53ef\u4ee5\u5927\u5927\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u7ef4\u62a4\u6027\uff0c\u5c24\u5176\u662f\u9762\u5bf9\u5177\u6709\u591a\u4e2a\u5206\u652f\u6761\u4ef6\u7684\u590d\u6742\u903b\u8f91\u65f6\u3002\u4e0e\u5806\u780cif&#8230;else\u8bed\u53e5\u76f8\u6bd4\uff0cswitch\u8bed\u53e5\u63d0\u4f9b\u4e86\u4e00\u79cd\u4f18\u96c5\u4e14\u9ad8\u6548\u7684\u66ff\u4ee3\u65b9\u6848\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>1. switch \u8bed\u53e5\u5982\u4f55\u7528\u4e8e\u591a\u4e2a\u6761\u4ef6\u5224\u65ad\uff1f<\/strong><\/p>\n<p>\u5728Go\u4e2d\uff0cswitch\u8bed\u53e5\u53ef\u4ee5\u7528\u4e8e\u5bf9\u591a\u4e2a\u6761\u4ef6\u8fdb\u884c\u5224\u65ad\u3002\u4f8b\u5982\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528switch\u8bed\u53e5\u6839\u636e\u4e0d\u540c\u7684\u503c\u6267\u884c\u4e0d\u540c\u7684\u64cd\u4f5c\u3002<\/p>\n<p><strong>2. switch \u8bed\u53e5\u53ef\u4ee5\u4e0e\u54ea\u4e9b\u6570\u636e\u7c7b\u578b\u4e00\u8d77\u4f7f\u7528\uff1f<\/strong><\/p>\n<p>switch\u8bed\u53e5\u53ef\u4ee5\u4e0e\u591a\u79cd\u6570\u636e\u7c7b\u578b\u4e00\u8d77\u4f7f\u7528\uff0c\u5305\u62ec\u6574\u578b\u3001\u5b57\u7b26\u578b\u3001\u5b57\u7b26\u4e32\u3001\u6d6e\u70b9\u6570\u7b49\u3002\u8fd9\u4f7f\u5f97\u5b83\u6210\u4e3a\u4e00\u4e2a\u975e\u5e38\u7075\u6d3b\u7684\u6761\u4ef6\u5224\u65ad\u5de5\u5177\u3002<\/p>\n<p><strong>3. switch \u8bed\u53e5\u53ef\u5426\u4f7f\u7528\u8303\u56f4\u5224\u65ad\u6761\u4ef6\uff1f<\/strong><\/p>\n<p>\u662f\u7684\uff0cswitch\u8bed\u53e5\u4e5f\u652f\u6301\u8303\u56f4\u5224\u65ad\u6761\u4ef6\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528\u5173\u952e\u5b57&quot;fallthrough&quot;\u6765\u5b9e\u73b0\u5728\u67d0\u4e2a\u6761\u4ef6\u6210\u7acb\u540e\u7ee7\u7eed\u6267\u884c\u4e0b\u4e00\u4e2a\u6761\u4ef6\u7684\u64cd\u4f5c\u3002\u8fd9\u5728\u9700\u8981\u5904\u7406\u591a\u4e2a\u6761\u4ef6\u65f6\u975e\u5e38\u6709\u7528\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Go\u7684switch\u8bed\u53e5\u662f\u4e00\u79cd\u6761\u4ef6\u8bed\u53e5\uff0c\u5b83\u5141\u8bb8\u57fa\u4e8e\u4e0d\u540c\u7684\u6761\u4ef6\u6267\u884c\u4e0d\u540c\u7684\u4ee3\u7801\u5757\u3002\u5b83\u4e3b\u8981\u7528\u4e8e\u53d6\u4ee3\u591a\u4e2aif&#038;#8230 [&hellip;]","protected":false},"author":3,"featured_media":299998,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/299991"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=299991"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/299991\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/299998"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=299991"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=299991"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=299991"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}