{"id":184719,"date":"2023-09-04T04:33:14","date_gmt":"2023-09-03T20:33:14","guid":{"rendered":"http:\/\/www.idc.net\/help\/184719\/"},"modified":"2023-09-04T04:33:14","modified_gmt":"2023-09-03T20:33:14","slug":"%e5%90%8e%e6%b5%aa%e4%ba%91go%e6%95%99%e7%a8%8bgo%e8%af%ad%e8%a8%80for-range%ef%bc%88%e9%94%ae%e5%80%bc%e5%be%aa%e7%8e%af%ef%bc%89","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/184719\/","title":{"rendered":"\u540e\u6d6a\u4e91GO\u6559\u7a0b:Go\u8bed\u8a00for range\uff08\u952e\u503c\u5faa\u73af\uff09"},"content":{"rendered":"<p>for range \u7ed3\u6784\u662fGo\u8bed\u8a00\u7279\u6709\u7684\u4e00\u79cd\u7684\u8fed\u4ee3\u7ed3\u6784\uff0c\u5728\u8bb8\u591a\u60c5\u51b5\u4e0b\u90fd\u975e\u5e38\u6709\u7528\uff0cfor range \u53ef\u4ee5\u904d\u5386\u6570\u7ec4\u3001\u5207\u7247\u3001\u5b57\u7b26\u4e32\u3001map \u53ca\u901a\u9053\uff08channel\uff09\uff0cfor range \u8bed\u6cd5\u4e0a\u7c7b\u4f3c\u4e8e\u5176\u5b83\u8bed\u8a00\u4e2d\u7684 foreach \u8bed\u53e5\uff0c\u4e00\u822c\u5f62\u5f0f\u4e3a\uff1a <\/p>\n<p> for key, val := range coll {<br \/> &nbsp; &nbsp; ...<br \/> }<\/p>\n<p> \u9700\u8981\u8981\u6ce8\u610f\u7684\u662f\uff0cval \u59cb\u7ec8\u4e3a\u96c6\u5408\u4e2d\u5bf9\u5e94\u7d22\u5f15\u7684\u503c\u62f7\u8d1d\uff0c\u56e0\u6b64\u5b83\u4e00\u822c\u53ea\u5177\u6709\u53ea\u8bfb\u6027\u8d28\uff0c\u5bf9\u5b83\u6240\u505a\u7684\u4efb\u4f55\u4fee\u6539\u90fd\u4e0d\u4f1a\u5f71\u54cd\u5230\u96c6\u5408\u4e2d\u539f\u6709\u7684\u503c\u3002\u4e00\u4e2a\u5b57\u7b26\u4e32\u662f Unicode \u7f16\u7801\u7684\u5b57\u7b26\uff08\u6216\u79f0\u4e4b\u4e3a rune \uff09\u96c6\u5408\uff0c\u56e0\u6b64\u4e5f\u53ef\u4ee5\u7528\u5b83\u6765\u8fed\u4ee3\u5b57\u7b26\u4e32\uff1a<br \/>\n <\/p>\n<p> for pos, char := range str {<br \/> &nbsp;&nbsp;&nbsp; ...<br \/> }<\/p>\n<p> \u6bcf\u4e2a rune \u5b57\u7b26\u548c\u7d22\u5f15\u5728 for range \u5faa\u73af\u4e2d\u662f\u4e00\u4e00\u5bf9\u5e94\u7684\uff0c\u5b83\u80fd\u591f\u81ea\u52a8\u6839\u636e UTF-8 \u89c4\u5219\u8bc6\u522b Unicode \u7f16\u7801\u7684\u5b57\u7b26\u3002 <\/p>\n<p> \u901a\u8fc7 for range \u904d\u5386\u7684\u8fd4\u56de\u503c\u6709\u4e00\u5b9a\u7684\u89c4\u5f8b\uff1a <\/p>\n<ul>\n<li> \u6570\u7ec4\u3001\u5207\u7247\u3001\u5b57\u7b26\u4e32\u8fd4\u56de\u7d22\u5f15\u548c\u503c\u3002<\/li>\n<li> map \u8fd4\u56de\u952e\u548c\u503c\u3002<\/li>\n<li> \u901a\u9053\uff08channel\uff09\u53ea\u8fd4\u56de\u901a\u9053\u5185\u7684\u503c\u3002<\/li>\n<\/ul>\n<h2> \u904d\u5386\u6570\u7ec4\u3001\u5207\u7247\u2014\u2014\u83b7\u5f97\u7d22\u5f15\u548c\u503c<\/h2>\n<p> \u5728\u904d\u5386\u4ee3\u7801\u4e2d\uff0ckey \u548c value \u5206\u522b\u4ee3\u8868\u5207\u7247\u7684\u4e0b\u6807\u53ca\u4e0b\u6807\u5bf9\u5e94\u7684\u503c\uff0c\u4e0b\u9762\u7684\u4ee3\u7801\u5c55\u793a\u5982\u4f55\u904d\u5386\u5207\u7247\uff0c\u6570\u7ec4\u4e5f\u662f\u7c7b\u4f3c\u7684\u904d\u5386\u65b9\u6cd5\uff1a <\/p>\n<pre>\r\nfor key, value := range []int{1, 2, 3, 4} {\r\n    fmt.Printf(\"key:%d  value:%d\\n\", key, value)\r\n}<\/pre>\n<p> \u4ee3\u7801\u8f93\u51fa\u5982\u4e0b\uff1a <\/p>\n<p> key:0&nbsp; value:1<br \/> key:1&nbsp; value:2<br \/> key:2&nbsp; value:3<br \/> key:3&nbsp; value:4<\/p>\n<h2> \u904d\u5386\u5b57\u7b26\u4e32\u2014\u2014\u83b7\u5f97\u5b57\u7b26<\/h2>\n<p> Go\u8bed\u8a00\u548c\u5176\u4ed6\u8bed\u8a00\u7c7b\u4f3c\uff0c\u53ef\u4ee5\u901a\u8fc7 for range \u7684\u7ec4\u5408\uff0c\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u904d\u5386\uff0c\u904d\u5386\u65f6\uff0ckey \u548c value \u5206\u522b\u4ee3\u8868\u5b57\u7b26\u4e32\u7684\u7d22\u5f15\u548c\u5b57\u7b26\u4e32\u4e2d\u7684\u6bcf\u4e00\u4e2a\u5b57\u7b26\u3002 <\/p>\n<p> \u4e0b\u9762\u8fd9\u6bb5\u4ee3\u7801\u5c55\u793a\u4e86\u5982\u4f55\u904d\u5386\u5b57\u7b26\u4e32\uff1a <\/p>\n<pre>\r\nvar str = \"hello \u4f60\u597d\"\r\nfor key, value := range str {\r\n    fmt.Printf(\"key:%d value:0x%x\\n\", key, value)\r\n}<\/pre>\n<p> \u4ee3\u7801\u8f93\u51fa\u5982\u4e0b\uff1a <\/p>\n<p> key:0 value:0x68<br \/> key:1 value:0x65<br \/> key:2 value:0x6c<br \/> key:3 value:0x6c<br \/> key:4 value:0x6f<br \/> key:5 value:0x20<br \/> key:6 value:0x4f60<br \/> key:9 value:0x597d<\/p>\n<p> \u4ee3\u7801\u4e2d\u7684\u53d8\u91cf&nbsp;value\uff0c\u5b9e\u9645\u7c7b\u578b\u662f rune \u7c7b\u578b\uff0c\u4ee5\u5341\u516d\u8fdb\u5236\u6253\u5370\u51fa\u6765\u5c31\u662f\u5b57\u7b26\u7684\u7f16\u7801\u3002 <\/p>\n<h2> \u904d\u5386 map\u2014\u2014\u83b7\u5f97 map \u7684\u952e\u548c\u503c<\/h2>\n<p> \u5bf9\u4e8e map \u7c7b\u578b\u6765\u8bf4\uff0cfor range \u904d\u5386\u65f6\uff0ckey \u548c value \u5206\u522b\u4ee3\u8868 map \u7684\u7d22\u5f15\u952e key \u548c\u7d22\u5f15\u5bf9\u5e94\u7684\u503c\uff0c\u4e00\u822c\u88ab\u79f0\u4e3a map \u7684\u952e\u503c\u5bf9\uff0c\u56e0\u4e3a\u5b83\u4eec\u662f\u4e00\u5bf9\u4e00\u5bf9\u51fa\u73b0\u7684\uff0c\u4e0b\u9762\u7684\u4ee3\u7801\u6f14\u793a\u4e86\u5982\u4f55\u904d\u5386 map\u3002 <\/p>\n<pre>\r\nm := map[string]int{\r\n    \"hello\": 100,\r\n    \"world\": 200,\r\n}\r\n\r\nfor key, value := range m {\r\n    fmt.Println(key, value)\r\n}<\/pre>\n<p> \u4ee3\u7801\u8f93\u51fa\u5982\u4e0b\uff1a <\/p>\n<p> hello 100<br \/> world 200<\/p>\n<h4> \u6ce8\u610f<\/h4>\n<p> \u5bf9 map \u904d\u5386\u65f6\uff0c\u904d\u5386\u8f93\u51fa\u7684\u952e\u503c\u662f\u65e0\u5e8f\u7684\uff0c\u5982\u679c\u9700\u8981\u6709\u5e8f\u7684\u952e\u503c\u5bf9\u8f93\u51fa\uff0c\u9700\u8981\u5bf9\u7ed3\u679c\u8fdb\u884c\u6392\u5e8f\u3002 <\/p>\n<h2> \u904d\u5386\u901a\u9053\uff08channel\uff09\u2014\u2014\u63a5\u6536\u901a\u9053\u6570\u636e<\/h2>\n<p> for range \u53ef\u4ee5\u904d\u5386\u901a\u9053\uff08channel\uff09\uff0c\u4f46\u662f\u901a\u9053\u5728\u904d\u5386\u65f6\uff0c\u53ea\u8f93\u51fa\u4e00\u4e2a\u503c\uff0c\u5373\u7ba1\u9053\u5185\u7684\u7c7b\u578b\u5bf9\u5e94\u7684\u6570\u636e\u3002 <\/p>\n<p> \u4e0b\u9762\u4ee3\u7801\u4e3a\u6211\u4eec\u5c55\u793a\u4e86\u901a\u9053\u7684\u904d\u5386\uff1a <\/p>\n<pre>\r\nc := make(chan int)\r\n\r\ngo func() {\r\n\r\n    c &lt;- 1\r\n    c &lt;- 2\r\n    c &lt;- 3\r\n    close(c)\r\n}()\r\n\r\nfor v := range c {\r\n    fmt.Println(v)\r\n}<\/pre>\n<p> \u4ee3\u7801\u8bf4\u660e\u5982\u4e0b\uff1a <\/p>\n<ul>\n<li> \u7b2c 1 \u884c\u521b\u5efa\u4e86\u4e00\u4e2a\u6574\u578b\u7c7b\u578b\u7684\u901a\u9053\u3002<\/li>\n<li> \u7b2c 3 \u884c\u542f\u52a8\u4e86\u4e00\u4e2a goroutine\uff0c\u5176\u903b\u8f91\u7684\u5b9e\u73b0\u4f53\u73b0\u5728\u7b2c 5\uff5e8 \u884c\uff0c\u5b9e\u73b0\u529f\u80fd\u662f\u5f80\u901a\u9053\u4e2d\u63a8\u9001\u6570\u636e 1\u30012\u30013\uff0c\u7136\u540e\u7ed3\u675f\u5e76\u5173\u95ed\u901a\u9053\u3002<\/li>\n<li> \u8fd9\u6bb5 goroutine \u5728\u58f0\u660e\u7ed3\u675f\u540e\uff0c\u5728\u7b2c 9 \u884c\u9a6c\u4e0a\u88ab\u6267\u884c\u3002<\/li>\n<li> \u4ece\u7b2c 11 \u884c\u5f00\u59cb\uff0c\u4f7f\u7528 for range \u5bf9\u901a\u9053 c \u8fdb\u884c\u904d\u5386\uff0c\u5176\u5b9e\u5c31\u662f\u4e0d\u65ad\u5730\u4ece\u901a\u9053\u4e2d\u53d6\u6570\u636e\uff0c\u76f4\u5230\u901a\u9053\u88ab\u5173\u95ed\u3002<\/li>\n<\/ul>\n<h2> \u5728\u904d\u5386\u4e2d\u9009\u62e9\u5e0c\u671b\u83b7\u5f97\u7684\u53d8\u91cf<\/h2>\n<p> \u5728\u4f7f\u7528 for range \u5faa\u73af\u904d\u5386\u67d0\u4e2a\u5bf9\u8c61\u65f6\uff0c\u4e00\u822c\u4e0d\u4f1a\u540c\u65f6\u9700\u8981 key \u6216\u8005 value\uff0c\u8fd9\u4e2a\u65f6\u5019\u53ef\u4ee5\u91c7\u7528\u4e00\u4e9b\u6280\u5de7\uff0c\u8ba9\u4ee3\u7801\u53d8\u5f97\u66f4\u7b80\u5355\uff0c\u4e0b\u9762\u5c06\u524d\u9762\u7684\u4f8b\u5b50\u4fee\u6539\u4e00\u4e0b\uff0c\u53c2\u8003\u4e0b\u9762\u7684\u4ee3\u7801\u793a\u4f8b\uff1a <\/p>\n<pre>\r\nm := map[string]int{\r\n    \"hello\": 100,\r\n    \"world\": 200,\r\n}\r\n\r\nfor _, value := range m {\r\n    fmt.Println(value)\r\n}<\/pre>\n<p> \u4ee3\u7801\u8f93\u51fa\u5982\u4e0b\uff1a <\/p>\n<p> 100<br \/> 200<\/p>\n<p> \u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\u5c06 key \u53d8\u6210\u4e86\u4e0b\u5212\u7ebf<br \/>\n<code>_<\/code>\uff0c\u8fd9\u91cc\u7684\u4e0b\u5212\u7ebf\u5c31\u662f\u533f\u540d\u53d8\u91cf\u3002 <\/p>\n<ul>\n<li> \u53ef\u4ee5\u7406\u89e3\u4e3a\u4e00\u79cd\u5360\u4f4d\u7b26\u3002<\/li>\n<li> \u533f\u540d\u53d8\u91cf\u672c\u8eab\u4e0d\u4f1a\u8fdb\u884c\u7a7a\u95f4\u5206\u914d\uff0c\u4e5f\u4e0d\u4f1a\u5360\u7528\u4e00\u4e2a\u53d8\u91cf\u7684\u540d\u5b57\u3002<\/li>\n<li> \u5728 for range \u53ef\u4ee5\u5bf9 key \u4f7f\u7528\u533f\u540d\u53d8\u91cf\uff0c\u4e5f\u53ef\u4ee5\u5bf9 value \u4f7f\u7528\u533f\u540d\u53d8\u91cf\u3002<\/li>\n<\/ul>\n<p> \u518d\u770b\u4e00\u4e2a\u533f\u540d\u53d8\u91cf\u7684\u4f8b\u5b50\uff1a <\/p>\n<pre>\r\nfor key, _ := range []int{1, 2, 3, 4} {\r\n    fmt.Printf(\"key:%d \\n\", key)\r\n}<\/pre>\n<p> \u4ee3\u7801\u8f93\u51fa\u5982\u4e0b\uff1a <\/p>\n<p> key:0<br \/> key:1<br \/> key:2<br \/> key:3<\/p>\n<p> \u5728\u8be5\u4f8b\u5b50\u4e2d\uff0cvalue \u88ab\u8bbe\u7f6e\u4e3a\u533f\u540d\u53d8\u91cf\uff0c\u53ea\u4f7f\u7528 key\uff0c\u800c key \u672c\u8eab\u5c31\u662f\u5207\u7247\u7684\u7d22\u5f15\uff0c\u6240\u4ee5\u4f8b\u5b50\u8f93\u51fa\u7d22\u5f15\u3002 <\/p>\n<p> \u6211\u4eec\u603b\u7ed3\u4e00\u4e0b for \u7684\u529f\u80fd\uff1a <\/p>\n<ul>\n<li> Go\u8bed\u8a00\u7684 for \u5305\u542b\u521d\u59cb\u5316\u8bed\u53e5\u3001\u6761\u4ef6\u8868\u8fbe\u5f0f\u3001\u7ed3\u675f\u8bed\u53e5\uff0c\u8fd9 3 \u4e2a\u90e8\u5206\u5747\u53ef\u7f3a\u7701\u3002<\/li>\n<li> for range \u652f\u6301\u5bf9\u6570\u7ec4\u3001\u5207\u7247\u3001\u5b57\u7b26\u4e32\u3001map\u3001\u901a\u9053\u8fdb\u884c\u904d\u5386\u64cd\u4f5c\u3002<\/li>\n<li> \u5728\u9700\u8981\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u533f\u540d\u53d8\u91cf\u5bf9 for range \u7684\u53d8\u91cf\u8fdb\u884c\u9009\u53d6\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>for range \u7ed3\u6784\u662fGo\u8bed\u8a00\u7279\u6709\u7684\u4e00\u79cd\u7684\u8fed\u4ee3\u7ed3\u6784\uff0c\u5728\u8bb8\u591a\u60c5\u51b5\u4e0b\u90fd\u975e\u5e38\u6709\u7528\uff0cfor range \u53ef\u4ee5\u904d\u5386\u6570 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[182396],"tags":[],"class_list":["post-184719","post","type-post","status-publish","format-standard","hentry","category-go"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/184719","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=184719"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/184719\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=184719"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=184719"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=184719"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}