{"id":3170,"date":"2025-03-25T23:44:51","date_gmt":"2025-03-25T15:44:51","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3170"},"modified":"2025-03-25T23:44:51","modified_gmt":"2025-03-25T15:44:51","slug":"go-%e8%af%ad%e8%a8%80%e6%9d%a1%e4%bb%b6%e8%af%ad%e5%8f%a5%ef%bc%88conditional-statements%ef%bc%89%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/25\/go-%e8%af%ad%e8%a8%80%e6%9d%a1%e4%bb%b6%e8%af%ad%e5%8f%a5%ef%bc%88conditional-statements%ef%bc%89%e8%af%a6%e8%a7%a3\/","title":{"rendered":"Go \u8bed\u8a00\u6761\u4ef6\u8bed\u53e5\uff08Conditional Statements\uff09\u8be6\u89e3"},"content":{"rendered":"\n<p>\u5728 Go \u8bed\u8a00\u4e2d\uff0c\u6761\u4ef6\u8bed\u53e5\u7528\u4e8e\u63a7\u5236\u7a0b\u5e8f\u7684\u6267\u884c\u6d41\u7a0b\uff0c\u5e38\u89c1\u7684\u6761\u4ef6\u8bed\u53e5\u6709\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>if<\/code> \u8bed\u53e5<\/li>\n\n\n\n<li><code>if...else<\/code> \u8bed\u53e5<\/li>\n\n\n\n<li><code>if...else if...else<\/code> \u8bed\u53e5<\/li>\n\n\n\n<li><code>switch<\/code> \u8bed\u53e5<\/li>\n\n\n\n<li><code>select<\/code> \u8bed\u53e5\uff08\u7528\u4e8e <code>goroutine<\/code> \u548c <code>channel<\/code>\uff09<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>1. if \u8bed\u53e5<\/strong><\/h2>\n\n\n\n<p><code>if<\/code> \u8bed\u53e5\u7528\u4e8e\u5224\u65ad\u67d0\u4e2a\u6761\u4ef6\u662f\u5426\u4e3a <code>true<\/code>\uff0c\u5982\u679c\u4e3a <code>true<\/code>\uff0c\u5219\u6267\u884c\u4ee3\u7801\u5757\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1.1 \u57fa\u672c\u8bed\u6cd5<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>if \u6761\u4ef6 {\n    \/\/ \u4ee3\u7801\u5757\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1.2 \u793a\u4f8b<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>package main\n\nimport \"fmt\"\n\nfunc main() {\n    age := 20\n\n    if age &gt;= 18 {\n        fmt.Println(\"\u6210\u5e74\u4eba\")\n    }\n}<\/code><\/pre>\n\n\n\n<p><strong>\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u6210\u5e74\u4eba<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>2. if\u2026else \u8bed\u53e5<\/strong><\/h2>\n\n\n\n<p><code>if...else<\/code> \u8bed\u53e5\u7528\u4e8e\u5728\u6761\u4ef6\u4e3a <code>false<\/code> \u65f6\u6267\u884c\u53e6\u4e00\u4e2a\u4ee3\u7801\u5757\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2.1 \u8bed\u6cd5<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>if \u6761\u4ef6 {\n    \/\/ \u6761\u4ef6\u4e3a true \u6267\u884c\n} else {\n    \/\/ \u6761\u4ef6\u4e3a false \u6267\u884c\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2.2 \u793a\u4f8b<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>package main\n\nimport \"fmt\"\n\nfunc main() {\n    num := 10\n\n    if num%2 == 0 {\n        fmt.Println(\"\u5076\u6570\")\n    } else {\n        fmt.Println(\"\u5947\u6570\")\n    }\n}<\/code><\/pre>\n\n\n\n<p><strong>\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u5076\u6570<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>3. if\u2026else if\u2026else \u8bed\u53e5<\/strong><\/h2>\n\n\n\n<p><code>if...else if...else<\/code> \u8bed\u53e5\u9002\u7528\u4e8e<strong>\u591a\u4e2a\u6761\u4ef6\u5206\u652f<\/strong>\u7684\u60c5\u51b5\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3.1 \u8bed\u6cd5<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>if \u6761\u4ef61 {\n    \/\/ \u6761\u4ef61\u4e3a true \u6267\u884c\n} else if \u6761\u4ef62 {\n    \/\/ \u6761\u4ef62\u4e3a true \u6267\u884c\n} else {\n    \/\/ \u4ee5\u4e0a\u6761\u4ef6\u90fd\u4e0d\u6ee1\u8db3\u6267\u884c\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3.2 \u793a\u4f8b<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>package main\n\nimport \"fmt\"\n\nfunc main() {\n    score := 85\n\n    if score &gt;= 90 {\n        fmt.Println(\"\u4f18\u79c0\")\n    } else if score &gt;= 75 {\n        fmt.Println(\"\u826f\u597d\")\n    } else if score &gt;= 60 {\n        fmt.Println(\"\u53ca\u683c\")\n    } else {\n        fmt.Println(\"\u4e0d\u53ca\u683c\")\n    }\n}<\/code><\/pre>\n\n\n\n<p><strong>\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u826f\u597d<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>4. if \u8bed\u53e5\u7684\u7b80\u77ed\u53d8\u91cf\u58f0\u660e<\/strong><\/h2>\n\n\n\n<p>\u5728 <code>if<\/code> \u8bed\u53e5\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>:=<\/code> \u8fdb\u884c<strong>\u7b80\u77ed\u53d8\u91cf\u58f0\u660e<\/strong>\uff0c\u8fd9\u79cd\u53d8\u91cf<strong>\u4ec5\u5728 <code>if<\/code> \u4ee3\u7801\u5757\u5185\u6709\u6548<\/strong>\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4.1 \u8bed\u6cd5<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>if \u53d8\u91cf := \u8868\u8fbe\u5f0f; \u6761\u4ef6 {\n    \/\/ \u4ee3\u7801\u5757\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4.2 \u793a\u4f8b<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>package main\n\nimport \"fmt\"\n\nfunc main() {\n    if num := 10; num%2 == 0 {\n        fmt.Println(num, \"\u662f\u5076\u6570\")\n    } else {\n        fmt.Println(num, \"\u662f\u5947\u6570\")\n    }\n}<\/code><\/pre>\n\n\n\n<p><strong>\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10 \u662f\u5076\u6570<\/code><\/pre>\n\n\n\n<p><strong>\u6ce8\u610f\uff1a<\/strong> <code>num<\/code> \u53d8\u91cf\u4ec5\u5728 <code>if<\/code> \u8bed\u53e5\u4f5c\u7528\u57df\u5185\u6709\u6548\uff0c\u65e0\u6cd5\u5728 <code>if<\/code> \u8bed\u53e5\u5916\u90e8\u4f7f\u7528\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>5. switch \u8bed\u53e5<\/strong><\/h2>\n\n\n\n<p><code>switch<\/code> \u8bed\u53e5\u662f\u4e00\u79cd\u591a\u5206\u652f\u7ed3\u6784\uff0c\u7c7b\u4f3c <code>if...else if...else<\/code>\uff0c\u4f46\u66f4\u7b80\u6d01\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>5.1 \u8bed\u6cd5<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>switch \u8868\u8fbe\u5f0f {\ncase \u503c1:\n    \/\/ \u4ee3\u7801\u5757\ncase \u503c2:\n    \/\/ \u4ee3\u7801\u5757\ndefault:\n    \/\/ \u4ee3\u7801\u5757\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>5.2 \u793a\u4f8b<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>package main\n\nimport \"fmt\"\n\nfunc main() {\n    day := 3\n\n    switch day {\n    case 1:\n        fmt.Println(\"\u661f\u671f\u4e00\")\n    case 2:\n        fmt.Println(\"\u661f\u671f\u4e8c\")\n    case 3:\n        fmt.Println(\"\u661f\u671f\u4e09\")\n    default:\n        fmt.Println(\"\u672a\u77e5\u65e5\u671f\")\n    }\n}<\/code><\/pre>\n\n\n\n<p><strong>\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u661f\u671f\u4e09<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>5.3 <code>switch<\/code> \u8bed\u53e5\u7684\u591a\u6761\u4ef6\u5339\u914d<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>package main\n\nimport \"fmt\"\n\nfunc main() {\n    score := 85\n\n    switch {\n    case score &gt;= 90:\n        fmt.Println(\"\u4f18\u79c0\")\n    case score &gt;= 75:\n        fmt.Println(\"\u826f\u597d\")\n    case score &gt;= 60:\n        fmt.Println(\"\u53ca\u683c\")\n    default:\n        fmt.Println(\"\u4e0d\u53ca\u683c\")\n    }\n}<\/code><\/pre>\n\n\n\n<p><strong>\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u826f\u597d<\/code><\/pre>\n\n\n\n<p><strong>\u7279\u70b9\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>switch<\/code> \u8bed\u53e5\u540e<strong>\u4e0d\u9700\u8981<\/strong>\u6307\u5b9a\u8868\u8fbe\u5f0f\uff0c\u76f4\u63a5\u5728 <code>case<\/code> \u8bed\u53e5\u4e2d\u4f7f\u7528\u6761\u4ef6\u5224\u65ad\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>6. switch \u8bed\u53e5\u7684 <code>fallthrough<\/code><\/strong><\/h2>\n\n\n\n<p>\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c<code>switch<\/code> \u5728\u5339\u914d <code>case<\/code> \u540e\u4e0d\u4f1a\u7ee7\u7eed\u6267\u884c\u540e\u7eed <code>case<\/code>\uff0c\u4f46\u4f7f\u7528 <code>fallthrough<\/code> \u5173\u952e\u5b57\u53ef\u4ee5\u8ba9 <code>switch<\/code> \u7ee7\u7eed\u6267\u884c\u4e0b\u4e00\u4e2a <code>case<\/code> \u4ee3\u7801\u5757\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>package main\n\nimport \"fmt\"\n\nfunc main() {\n    num := 2\n\n    switch num {\n    case 1:\n        fmt.Println(\"\u4e00\")\n    case 2:\n        fmt.Println(\"\u4e8c\")\n        fallthrough\n    case 3:\n        fmt.Println(\"\u4e09\")\n    default:\n        fmt.Println(\"\u5176\u4ed6\")\n    }\n}<\/code><\/pre>\n\n\n\n<p><strong>\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u4e8c\n\u4e09<\/code><\/pre>\n\n\n\n<p><strong>\u6ce8\u610f\uff1a<\/strong> <code>fallthrough<\/code> <strong>\u4e0d\u4f1a\u5224\u65ad\u4e0b\u4e00\u4e2a <code>case<\/code> \u662f\u5426\u5339\u914d\uff0c\u76f4\u63a5\u6267\u884c\u4e0b\u4e00 <code>case<\/code><\/strong>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>7. select \u8bed\u53e5\uff08\u7528\u4e8e <code>channel<\/code>\uff09<\/strong><\/h2>\n\n\n\n<p><code>select<\/code> \u8bed\u53e5\u7528\u4e8e<strong>\u76d1\u542c\u591a\u4e2a <code>channel<\/code><\/strong>\uff0c\u5f53\u5176\u4e2d\u4e00\u4e2a <code>channel<\/code> \u53ef\u7528\u65f6\u6267\u884c\u76f8\u5e94\u7684 <code>case<\/code> \u4ee3\u7801\u5757\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>7.1 \u8bed\u6cd5<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>select {\ncase &lt;-channel1:\n    \/\/ \u5f53 channel1 \u53ef\u8bfb\u65f6\u6267\u884c\ncase &lt;-channel2:\n    \/\/ \u5f53 channel2 \u53ef\u8bfb\u65f6\u6267\u884c\ndefault:\n    \/\/ \u5982\u679c\u6240\u6709 channel \u90fd\u4e0d\u53ef\u8bfb\uff0c\u5219\u6267\u884c\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>7.2 \u793a\u4f8b<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>package main\n\nimport (\n    \"fmt\"\n    \"time\"\n)\n\nfunc main() {\n    ch1 := make(chan string, 1)\n    ch2 := make(chan string, 1)\n\n    ch1 &lt;- \"\u6570\u636e1\"\n\n    select {\n    case msg := &lt;-ch1:\n        fmt.Println(\"\u63a5\u6536:\", msg)\n    case msg := &lt;-ch2:\n        fmt.Println(\"\u63a5\u6536:\", msg)\n    default:\n        fmt.Println(\"\u6ca1\u6709\u6570\u636e\")\n    }\n}<\/code><\/pre>\n\n\n\n<p><strong>\u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u63a5\u6536: \u6570\u636e1<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>8. \u603b\u7ed3<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u8bed\u53e5<\/th><th>\u7528\u9014<\/th><\/tr><\/thead><tbody><tr><td><code>if<\/code><\/td><td>\u4ec5\u6267\u884c\u5355\u4e2a\u6761\u4ef6\u5224\u65ad<\/td><\/tr><tr><td><code>if...else<\/code><\/td><td>\u4e24\u4e2a\u6761\u4ef6\u5206\u652f<\/td><\/tr><tr><td><code>if...else if...else<\/code><\/td><td>\u591a\u4e2a\u6761\u4ef6\u5206\u652f<\/td><\/tr><tr><td><code>switch<\/code><\/td><td>\u66ff\u4ee3 <code>if...else if...else<\/code>\uff0c\u66f4\u7b80\u6d01<\/td><\/tr><tr><td><code>switch<\/code> + <code>fallthrough<\/code><\/td><td>\u5f3a\u5236\u6267\u884c\u4e0b\u4e00\u4e2a <code>case<\/code><\/td><\/tr><tr><td><code>select<\/code><\/td><td>\u7528\u4e8e <code>channel<\/code> \u5904\u7406\u5e76\u53d1<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 Go \u8bed\u8a00\u4e2d\uff0c\u6761\u4ef6\u8bed\u53e5\u7528\u4e8e\u63a7\u5236\u7a0b\u5e8f\u7684\u6267\u884c\u6d41\u7a0b\uff0c\u5e38\u89c1\u7684\u6761\u4ef6\u8bed\u53e5\u6709\uff1a 1. if \u8bed\u53e5 if \u8bed\u53e5\u7528\u4e8e\u5224\u65ad\u67d0\u4e2a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3171,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[58],"tags":[],"class_list":["post-3170","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-golang"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3170","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=3170"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3170\/revisions"}],"predecessor-version":[{"id":3172,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3170\/revisions\/3172"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/3171"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=3170"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=3170"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=3170"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}