{"id":44097,"date":"2023-07-18T20:59:39","date_gmt":"2023-03-24T16:41:42","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%ae%8c%e6%88%90%e3%80%8aa-tour-of-go%e3%80%8b%e7%9a%84%e5%ad%a6%e4%b9%a0\/"},"modified":"2024-04-30T14:14:18","modified_gmt":"2024-04-30T06:14:18","slug":"%e5%ae%8c%e6%88%90%e3%80%8aa-tour-of-go%e3%80%8b%e7%9a%84%e5%ad%a6%e4%b9%a0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%ae%8c%e6%88%90%e3%80%8aa-tour-of-go%e3%80%8b%e7%9a%84%e5%ad%a6%e4%b9%a0\/","title":{"rendered":"\u5b8c\u6210\u300aA Tour of Go\u300b\u7684\u5b66\u4e60"},"content":{"rendered":"<p>\u6211\u82b1\u4e86\u5927\u7ea6\u4e00\u4e2a\u6708\u7684\u65f6\u95f4\u5b8c\u6210\u4e86Go\u8bed\u8a00\u7684\u6559\u7a0b\u300aA Tour of Go\u300b\u3002\u6211\u4f7f\u7528\u7684\u6267\u884c\u73af\u5883\u53ea\u662f\u8be5\u7f51\u7ad9\u5185\u7684playground\u5de5\u5177\u3002<\/p>\n<h3>\u501f\u9274\u7684\u5185\u5bb9<\/h3>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">How to Write Go Code<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">WEB+DB PRESS vol.82 \u306f\u3058\u3081\u3066\u306eGo<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">WEB+DB PRESS vol.95 Go\u306b\u3088\u308b\u4e26\u884c\u51e6\u7406<\/ul>\n<p>\u4ee5\u4e0b\u662f\u5404\u4e2a\u95ee\u9898\u6240\u5199\u7684\u4ee3\u7801\u548c\u7b14\u8bb0\u3002<\/p>\n<h2>2016\u5e7411\u670813\u65e5\u5f00\u59cb<\/h2>\n<p>\u503c\u5f97\u7eaa\u5ff5\u7684\u5f00\u59cb\u5b66\u4e60Go\u7684\u4e00\u5929\u3002\u5305\u3002<\/p>\n<h2>2016\u5e7411\u670823\u65e5\u7684\u8ab2\u984c\u662f\u95dc\u65bc\u300cFor\u5faa\u74b0\u300d\u548c\u300c\u725b\u9813\u6cd5\u300d\u3002<\/h2>\n<p>\u5904\u7406\u725b\u987f\u6cd5\u7684\u95ee\u9898\u3002\u770b\u5230\u8fd9\u4e2a\u65b9\u7a0b\u5f0f\u7a81\u7136\u5c31\u89c9\u5f97\u7cdf\u7cd5\u3002\u5c3d\u529b\u83b7\u5f97\u6b63\u786e\u7684\u8f93\u51fa\u7ed3\u679c\uff0c\u4f46\u662f\u5374\u4e0d\u4f7f\u7528for\u5faa\u73af\uff0c\u800c\u5f3a\u884c\u4f7f\u7528\u9012\u5f52\u5904\u7406\u548c\u5168\u5c40\u53d8\u91cf\u7b49\uff0c\u65e0\u6cd5\u7406\u89e3\u51fa\u9898\u8005\u7684\u610f\u56fe&#8230;<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">package<\/span> <span class=\"n\">main<\/span>\r\n\r\n<span class=\"k\">import<\/span> <span class=\"p\">(<\/span>\r\n     <span class=\"s\">\"fmt\"<\/span>\r\n     <span class=\"s\">\"math\"<\/span>\r\n<span class=\"p\">)<\/span>\r\n\r\n<span class=\"k\">var<\/span> <span class=\"n\">z<\/span> <span class=\"o\">=<\/span> <span class=\"m\">1.0<\/span>\r\n<span class=\"k\">var<\/span> <span class=\"n\">cnt<\/span> <span class=\"o\">=<\/span> <span class=\"m\">0<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">Sqrt<\/span><span class=\"p\">(<\/span><span class=\"n\">x<\/span> <span class=\"kt\">float64<\/span><span class=\"p\">)<\/span> <span class=\"kt\">float64<\/span> <span class=\"p\">{<\/span>\r\n     <span class=\"n\">zbuf<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">z<\/span>\r\n     <span class=\"n\">z<\/span> <span class=\"o\">=<\/span> <span class=\"n\">z<\/span> <span class=\"o\">-<\/span> <span class=\"p\">(<\/span><span class=\"n\">z<\/span><span class=\"o\">*<\/span><span class=\"n\">z<\/span><span class=\"o\">-<\/span><span class=\"n\">x<\/span><span class=\"p\">)<\/span><span class=\"o\">\/<\/span><span class=\"p\">(<\/span><span class=\"m\">2<\/span><span class=\"o\">*<\/span><span class=\"n\">z<\/span><span class=\"p\">)<\/span>\r\n     <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"n\">cnt<\/span><span class=\"p\">,<\/span> <span class=\"n\">z<\/span><span class=\"p\">)<\/span>\r\n     <span class=\"k\">if<\/span> <span class=\"n\">math<\/span><span class=\"o\">.<\/span><span class=\"n\">Abs<\/span><span class=\"p\">(<\/span><span class=\"n\">zbuf<\/span><span class=\"o\">-<\/span><span class=\"n\">z<\/span><span class=\"p\">)<\/span> <span class=\"o\">&lt;<\/span> <span class=\"m\">0.000001<\/span> <span class=\"p\">{<\/span>\r\n          <span class=\"k\">return<\/span> <span class=\"n\">z<\/span>\r\n     <span class=\"p\">}<\/span>\r\n     <span class=\"n\">cnt<\/span><span class=\"o\">++<\/span>\r\n     <span class=\"k\">return<\/span> <span class=\"n\">Sqrt<\/span><span class=\"p\">(<\/span><span class=\"n\">x<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n     <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"n\">Sqrt<\/span><span class=\"p\">(<\/span><span class=\"m\">3<\/span><span class=\"p\">))<\/span>\r\n     <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"n\">math<\/span><span class=\"o\">.<\/span><span class=\"n\">Sqrt<\/span><span class=\"p\">(<\/span><span class=\"m\">3<\/span><span class=\"p\">))<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c<\/p>\n<pre class=\"post-pre\"><code>0 2\r\n1 1.75\r\n2 1.7321428571428572\r\n3 1.7320508100147276\r\n4 1.7320508075688772\r\n1.7320508075688772\r\n1.7320508075688772\r\n<\/code><\/pre>\n<h2>2016\u5e7411\u670826\u65e5\u7684\u4f5c\u4e1a\uff1a\u5207\u7247<\/h2>\n<p>\u7ec3\u4e60\uff1a\u5207\u7247<br \/>\n\u8fd9\u4e2a\u4e5f\u5f88\u96be\uff0c\u4f46\u662f\u82e5\u6709\u6240\u601d\u4e4b\u540e\u5c31\u505a\u51fa\u6765\u4e86\u3002\u5f53\u51fa\u73b0\u6f02\u4eae\u7684\u56fe\u50cf\u65f6\uff0c\u611f\u5230\u975e\u5e38\u6fc0\u52a8\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">package<\/span> <span class=\"n\">main<\/span>\r\n\r\n<span class=\"k\">import<\/span> <span class=\"p\">(<\/span>\r\n<span class=\"s\">\"golang.org\/x\/tour\/pic\"<\/span>\r\n     <span class=\"p\">)<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">Pic<\/span><span class=\"p\">(<\/span><span class=\"n\">dx<\/span><span class=\"p\">,<\/span> <span class=\"n\">dy<\/span> <span class=\"kt\">int<\/span><span class=\"p\">)<\/span> <span class=\"p\">[][]<\/span><span class=\"kt\">uint8<\/span> <span class=\"p\">{<\/span>\r\n     <span class=\"n\">pic<\/span> <span class=\"o\">:=<\/span> <span class=\"nb\">make<\/span><span class=\"p\">([][]<\/span><span class=\"kt\">uint8<\/span><span class=\"p\">,<\/span> <span class=\"n\">dy<\/span><span class=\"p\">)<\/span>\r\n     <span class=\"k\">for<\/span> <span class=\"n\">y<\/span> <span class=\"o\">:=<\/span> <span class=\"m\">0<\/span><span class=\"p\">;<\/span> <span class=\"n\">y<\/span> <span class=\"o\">&lt;<\/span> <span class=\"n\">dy<\/span><span class=\"p\">;<\/span> <span class=\"n\">y<\/span><span class=\"o\">++<\/span> <span class=\"p\">{<\/span>\r\n          <span class=\"n\">pic<\/span><span class=\"p\">[<\/span><span class=\"n\">y<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nb\">make<\/span><span class=\"p\">([]<\/span><span class=\"kt\">uint8<\/span><span class=\"p\">,<\/span> <span class=\"n\">dx<\/span><span class=\"p\">)<\/span>\r\n          <span class=\"k\">for<\/span> <span class=\"n\">x<\/span> <span class=\"o\">:=<\/span> <span class=\"m\">0<\/span><span class=\"p\">;<\/span> <span class=\"n\">x<\/span> <span class=\"o\">&lt;<\/span> <span class=\"n\">dx<\/span><span class=\"p\">;<\/span> <span class=\"n\">x<\/span><span class=\"o\">++<\/span> <span class=\"p\">{<\/span>\r\n               <span class=\"n\">pic<\/span><span class=\"p\">[<\/span><span class=\"n\">y<\/span><span class=\"p\">][<\/span><span class=\"n\">x<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"kt\">uint8<\/span><span class=\"p\">((<\/span><span class=\"n\">x<\/span><span class=\"o\">+<\/span><span class=\"n\">y<\/span><span class=\"p\">)<\/span><span class=\"o\">\/<\/span><span class=\"m\">2<\/span><span class=\"p\">)<\/span>\r\n          <span class=\"p\">}<\/span>\r\n\r\n     <span class=\"p\">}<\/span>\r\n     <span class=\"k\">return<\/span> <span class=\"n\">pic<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n     <span class=\"n\">pic<\/span><span class=\"o\">.<\/span><span class=\"n\">Show<\/span><span class=\"p\">(<\/span><span class=\"n\">Pic<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"Slice.png\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d56e837434c4406cdb313\/14-0.png\" alt=\"Slice.png\" \/><\/div>\n<h2>2016\u5e7411\u670826\u65e5\u7684\u554f\u984c\uff1a\u5730\u5716<\/h2>\n<p>\u7ec3\u4e60\uff1a\u5730\u56fe<br \/>\n\u5730\u56fe\u7684\u4efb\u52a1\u3002\u5728\u67e5\u770bAPI\u53c2\u8003\u6587\u6863\u7684\u540c\u65f6\u7f16\u5199\u4e86\u4ee3\u7801\u3002\u603b\u7b97\u505a\u5b8c\u4e86\u3002\u4f46\u662f\u5f53\u6211\u56de\u5934\u770b\u4ee3\u7801\u65f6\u5374\u641e\u4e0d\u6e05\u695a\u5b83\u5728\u505a\u4ec0\u4e48\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">package<\/span> <span class=\"n\">main<\/span>\r\n\r\n<span class=\"k\">import<\/span> <span class=\"p\">(<\/span>\r\n    <span class=\"s\">\"strings\"<\/span>\r\n    <span class=\"s\">\"fmt\"<\/span>\r\n    <span class=\"s\">\"golang.org\/x\/tour\/wc\"<\/span>\r\n<span class=\"p\">)<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">WordCount<\/span><span class=\"p\">(<\/span><span class=\"n\">s<\/span> <span class=\"kt\">string<\/span><span class=\"p\">)<\/span> <span class=\"k\">map<\/span><span class=\"p\">[<\/span><span class=\"kt\">string<\/span><span class=\"p\">]<\/span><span class=\"kt\">int<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">sf<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">strings<\/span><span class=\"o\">.<\/span><span class=\"n\">Fields<\/span><span class=\"p\">(<\/span><span class=\"n\">s<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"n\">sf<\/span><span class=\"p\">)<\/span>\r\n\r\n    <span class=\"n\">smap<\/span> <span class=\"o\">:=<\/span> <span class=\"nb\">make<\/span><span class=\"p\">(<\/span><span class=\"k\">map<\/span><span class=\"p\">[<\/span><span class=\"kt\">string<\/span><span class=\"p\">]<\/span><span class=\"kt\">int<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"k\">for<\/span> <span class=\"n\">_<\/span><span class=\"p\">,<\/span> <span class=\"n\">elm<\/span> <span class=\"o\">:=<\/span> <span class=\"k\">range<\/span> <span class=\"n\">sf<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"n\">elm<\/span><span class=\"p\">)<\/span>\r\n        <span class=\"n\">smap<\/span><span class=\"p\">[<\/span><span class=\"n\">elm<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"n\">smap<\/span><span class=\"p\">[<\/span><span class=\"n\">elm<\/span><span class=\"p\">]<\/span> <span class=\"o\">+<\/span> <span class=\"m\">1<\/span>\r\n    <span class=\"p\">}<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"n\">smap<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">wc<\/span><span class=\"o\">.<\/span><span class=\"n\">Test<\/span><span class=\"p\">(<\/span><span class=\"n\">WordCount<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c<\/p>\n<pre class=\"post-pre\"><code>[I am learning Go!]\r\nI\r\nam\r\nlearning\r\nGo!\r\nPASS\r\n f(\"I am learning Go!\") = \r\n  map[string]int{\"I\":1, \"am\":1, \"learning\":1, \"Go!\":1}\r\n[The quick brown fox jumped over the lazy dog.]\r\nThe\r\nquick\r\nbrown\r\nfox\r\njumped\r\nover\r\nthe\r\nlazy\r\ndog.\r\nPASS\r\n f(\"The quick brown fox jumped over the lazy dog.\") = \r\n  map[string]int{\"jumped\":1, \"the\":1, \"The\":1, \"quick\":1, \"brown\":1, \"fox\":1, \"over\":1, \"lazy\":1, \"dog.\":1}\r\n[I ate a donut. Then I ate another donut.]\r\nI\r\nate\r\na\r\ndonut.\r\nThen\r\nI\r\nate\r\nanother\r\ndonut.\r\nPASS\r\n f(\"I ate a donut. Then I ate another donut.\") = \r\n  map[string]int{\"another\":1, \"I\":2, \"ate\":2, \"a\":1, \"donut.\":2, \"Then\":1}\r\n[A man a plan a canal panama.]\r\nA\r\nman\r\na\r\nplan\r\na\r\ncanal\r\npanama.\r\nPASS\r\n f(\"A man a plan a canal panama.\") = \r\n  map[string]int{\"man\":1, \"a\":2, \"plan\":1, \"canal\":1, \"panama.\":1, \"A\":1}\r\n<\/code><\/pre>\n<h2>2016\/11\/27\u7684\u8bfe\u9898\uff1a\u95ed\u5305\/\u6590\u6ce2\u90a3\u5951\u6570\u5217\u3002<\/h2>\n<p>\u7ec3\u4e60\uff1a\u6590\u6ce2\u90a3\u5951\u6570\u5217<br \/>\n\u8bb0\u5f97\u5f53\u521d\u6211\u66fe\u8d39\u5f88\u5927\u52b2\uff0c\u4f46\u6700\u7ec8\u6210\u529f\u4e86\u3002\u5982\u4eca\u56de\u8fc7\u5934\u518d\u770b\u8fd9\u6bb5\u4ee3\u7801\uff0c\u4ecd\u7136\u6709\u4e9b\u641e\u4e0d\u660e\u767d\uff08\u6c57\uff09<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">package<\/span> <span class=\"n\">main<\/span>\r\n\r\n<span class=\"k\">import<\/span> <span class=\"s\">\"fmt\"<\/span>\r\n\r\n<span class=\"c\">\/\/ fibonacci is a function that returns<\/span>\r\n<span class=\"c\">\/\/ a function that returns an int.<\/span>\r\n<span class=\"k\">func<\/span> <span class=\"n\">fibonacci<\/span><span class=\"p\">()<\/span> <span class=\"k\">func<\/span><span class=\"p\">()<\/span> <span class=\"kt\">int<\/span> <span class=\"p\">{<\/span>\r\n     <span class=\"k\">var<\/span> <span class=\"n\">f<\/span> <span class=\"p\">[]<\/span><span class=\"kt\">int<\/span>\r\n     <span class=\"k\">return<\/span> <span class=\"k\">func<\/span><span class=\"p\">()<\/span> <span class=\"kt\">int<\/span> <span class=\"p\">{<\/span>\r\n          <span class=\"k\">switch<\/span> <span class=\"nb\">len<\/span><span class=\"p\">(<\/span><span class=\"n\">f<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n          <span class=\"k\">case<\/span> <span class=\"m\">0<\/span><span class=\"o\">:<\/span>\r\n               <span class=\"n\">f<\/span> <span class=\"o\">=<\/span> <span class=\"nb\">append<\/span><span class=\"p\">(<\/span><span class=\"n\">f<\/span><span class=\"p\">,<\/span> <span class=\"m\">0<\/span><span class=\"p\">)<\/span>\r\n          <span class=\"k\">case<\/span> <span class=\"m\">1<\/span><span class=\"o\">:<\/span>\r\n               <span class=\"n\">f<\/span> <span class=\"o\">=<\/span> <span class=\"nb\">append<\/span><span class=\"p\">(<\/span><span class=\"n\">f<\/span><span class=\"p\">,<\/span> <span class=\"m\">1<\/span><span class=\"p\">)<\/span>\r\n          <span class=\"k\">default<\/span><span class=\"o\">:<\/span>\r\n               <span class=\"n\">f<\/span> <span class=\"o\">=<\/span> <span class=\"nb\">append<\/span><span class=\"p\">(<\/span><span class=\"n\">f<\/span><span class=\"p\">,<\/span> <span class=\"p\">(<\/span><span class=\"n\">f<\/span><span class=\"p\">[<\/span><span class=\"nb\">len<\/span><span class=\"p\">(<\/span><span class=\"n\">f<\/span><span class=\"p\">)<\/span><span class=\"o\">-<\/span><span class=\"m\">2<\/span><span class=\"p\">]<\/span> <span class=\"o\">+<\/span> <span class=\"n\">f<\/span><span class=\"p\">[<\/span><span class=\"nb\">len<\/span><span class=\"p\">(<\/span><span class=\"n\">f<\/span><span class=\"p\">)<\/span><span class=\"o\">-<\/span><span class=\"m\">1<\/span><span class=\"p\">]))<\/span>\r\n          <span class=\"p\">}<\/span>\r\n          <span class=\"k\">return<\/span> <span class=\"n\">f<\/span><span class=\"p\">[<\/span><span class=\"nb\">len<\/span><span class=\"p\">(<\/span><span class=\"n\">f<\/span><span class=\"p\">)<\/span><span class=\"o\">-<\/span><span class=\"m\">1<\/span><span class=\"p\">]<\/span>\r\n     <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n     <span class=\"n\">f<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">fibonacci<\/span><span class=\"p\">()<\/span>\r\n     <span class=\"k\">for<\/span> <span class=\"n\">i<\/span> <span class=\"o\">:=<\/span> <span class=\"m\">0<\/span><span class=\"p\">;<\/span> <span class=\"n\">i<\/span> <span class=\"o\">&lt;<\/span> <span class=\"m\">10<\/span><span class=\"p\">;<\/span> <span class=\"n\">i<\/span><span class=\"o\">++<\/span> <span class=\"p\">{<\/span>\r\n          <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"n\">f<\/span><span class=\"p\">())<\/span>\r\n     <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c (Ch\u016b l\u00ec ji\u00e9 gu\u01d2)<\/p>\n<pre class=\"post-pre\"><code>0\r\n1\r\n1\r\n2\r\n3\r\n5\r\n8\r\n13\r\n21\r\n34\r\n<\/code><\/pre>\n<h2>2016\u5e7412\u670811\u65e5\u7684\u8bfe\u9898\u662f\uff1a\u9519\u8bef\u3002<\/h2>\n<p>\u7ec3\u4e60\uff1a\u9519\u8bef<br \/>\n\u6211\u8bb0\u4e0d\u592a\u6e05\u695a\u4e86\u3002\u5927\u81f4\u4e0a\uff0c\u6211\u8ba4\u4e3a\u505a\u5f97\u4e0d\u9519\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">package<\/span> <span class=\"n\">main<\/span>\r\n\r\n<span class=\"k\">import<\/span> <span class=\"p\">(<\/span>\r\n    <span class=\"s\">\"fmt\"<\/span>\r\n    <span class=\"s\">\"math\"<\/span>\r\n<span class=\"p\">)<\/span>\r\n\r\n<span class=\"k\">type<\/span> <span class=\"n\">ErrNegativeSqrt<\/span> <span class=\"kt\">float64<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"p\">(<\/span><span class=\"n\">e<\/span> <span class=\"n\">ErrNegativeSqrt<\/span><span class=\"p\">)<\/span> <span class=\"n\">Error<\/span><span class=\"p\">()<\/span> <span class=\"kt\">string<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Sprintf<\/span><span class=\"p\">(<\/span><span class=\"s\">\"cannot Sqrt negative number: %v\"<\/span><span class=\"p\">,<\/span><span class=\"kt\">float64<\/span><span class=\"p\">(<\/span><span class=\"n\">e<\/span><span class=\"p\">))<\/span>\r\n<span class=\"p\">}<\/span>\r\n<span class=\"k\">func<\/span> <span class=\"n\">Sqrt<\/span><span class=\"p\">(<\/span><span class=\"n\">x<\/span> <span class=\"kt\">float64<\/span><span class=\"p\">)<\/span> <span class=\"p\">(<\/span><span class=\"kt\">float64<\/span><span class=\"p\">,<\/span> <span class=\"kt\">error<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">var<\/span> <span class=\"n\">err<\/span> <span class=\"n\">ErrNegativeSqrt<\/span>\r\n    <span class=\"k\">if<\/span> <span class=\"n\">x<\/span> <span class=\"o\">&lt;<\/span> <span class=\"m\">0<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">err<\/span> <span class=\"o\">=<\/span> <span class=\"n\">ErrNegativeSqrt<\/span><span class=\"p\">(<\/span><span class=\"n\">x<\/span><span class=\"p\">)<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"m\">0<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"n\">last_z<\/span><span class=\"p\">,<\/span> <span class=\"n\">z<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">x<\/span><span class=\"p\">,<\/span> <span class=\"m\">1.0<\/span>\r\n    <span class=\"k\">for<\/span> <span class=\"n\">math<\/span><span class=\"o\">.<\/span><span class=\"n\">Abs<\/span><span class=\"p\">(<\/span><span class=\"n\">z<\/span><span class=\"o\">-<\/span><span class=\"n\">last_z<\/span><span class=\"p\">)<\/span> <span class=\"o\">&gt;=<\/span> <span class=\"m\">1.0e-6<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">last_z<\/span><span class=\"p\">,<\/span> <span class=\"n\">z<\/span> <span class=\"o\">=<\/span> <span class=\"n\">z<\/span><span class=\"p\">,<\/span> <span class=\"n\">z<\/span><span class=\"o\">-<\/span><span class=\"p\">(<\/span><span class=\"n\">z<\/span><span class=\"o\">*<\/span><span class=\"n\">z<\/span><span class=\"o\">-<\/span><span class=\"n\">x<\/span><span class=\"p\">)<\/span><span class=\"o\">\/<\/span><span class=\"p\">(<\/span><span class=\"m\">2<\/span><span class=\"o\">*<\/span><span class=\"n\">z<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"p\">}<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"n\">z<\/span><span class=\"p\">,<\/span> <span class=\"no\">nil<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"n\">Sqrt<\/span><span class=\"p\">(<\/span><span class=\"m\">2<\/span><span class=\"p\">))<\/span>\r\n    <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"n\">Sqrt<\/span><span class=\"p\">(<\/span><span class=\"o\">-<\/span><span class=\"m\">2<\/span><span class=\"p\">))<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c (Ch\u016b l\u00ec ji\u00e9 gu\u01d2)<\/p>\n<pre class=\"post-pre\"><code>1.4142135623730951 &lt;nil&gt;\r\n0 cannot Sqrt negative number: -2\r\n<\/code><\/pre>\n<h2>2016\u5e7412\u670811\u65e5\u7684\u8bfe\u9898\u662f\u300a\u8bfb\u8005\u300b\u3002<\/h2>\n<p>\u7ec3\u4e60\uff1a\u8bfb\u8005<br \/>\n\u8bf7\u5b9e\u73b0\u4e00\u4e2a\u8f93\u51fa\u65e0\u9650\u6d41ASCII\u5b57\u7b26 &#8216;A&#8217; \u7684Reader\u7c7b\u578b\u3002\u8fd9\u4e2a\u4efb\u52a1\u6709\u70b9\u6a21\u7cca\u4e0d\u6e05\uff0c\u6211\u4e0d\u592a\u8bb0\u5f97\u4e86\uff0c\u4e0d\u8fc7\u597d\u50cf\u505a\u51fa\u6765\u4e86\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">package<\/span> <span class=\"n\">main<\/span>\r\n\r\n<span class=\"k\">import<\/span> <span class=\"s\">\"golang.org\/x\/tour\/reader\"<\/span>\r\n\r\n<span class=\"k\">type<\/span> <span class=\"n\">MyReader<\/span> <span class=\"k\">struct<\/span><span class=\"p\">{}<\/span>\r\n\r\n<span class=\"c\">\/\/ TODO: Add a Read([]byte) (int, error) method to MyReader.<\/span>\r\n<span class=\"k\">func<\/span> <span class=\"p\">(<\/span><span class=\"n\">r<\/span> <span class=\"n\">MyReader<\/span><span class=\"p\">)<\/span> <span class=\"n\">Read<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span> <span class=\"p\">[]<\/span><span class=\"kt\">byte<\/span><span class=\"p\">)<\/span> <span class=\"p\">(<\/span><span class=\"kt\">int<\/span><span class=\"p\">,<\/span> <span class=\"kt\">error<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">for<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"nb\">copy<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span><span class=\"p\">,<\/span><span class=\"s\">\"A\"<\/span><span class=\"p\">)<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"m\">1<\/span><span class=\"p\">,<\/span> <span class=\"no\">nil<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">reader<\/span><span class=\"o\">.<\/span><span class=\"n\">Validate<\/span><span class=\"p\">(<\/span><span class=\"n\">MyReader<\/span><span class=\"p\">{})<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c<\/p>\n<pre class=\"post-pre\"><code>OK!\r\n<\/code><\/pre>\n<h2>2016\/12\/11\u95ee\u9898\uff1a\u5c06Reader\u8fdb\u884c\u5305\u88f9\/rot13Reader<\/h2>\n<p>\u8fd9\u662f\u653e\u5f03\u4e86\u3002\u65e0\u6cd5\u5b8c\u6210\u3002\u7ec3\u4e60\uff1arot13Reader\u3002<\/p>\n<h2>2016\u5e7412\u670814\u65e5\u7684\u8ab2\u984c\u662f\u8207Image\u4ecb\u9762\u6709\u95dc\u3002<\/h2>\n<p>\u7ec3\u4e60\uff1a\u56fe\u50cf<br \/>\n\u867d\u7136\u8bb0\u4e0d\u592a\u6e05\u695a\u4e86\uff0c\u4f46\u662f\u6211\u901a\u8fc7\u67e5\u770bAPI\u53c2\u8003\u6587\u6863\u6765\u6a21\u4eff\u5199\u51fa\u6765\u7684\uff0c\u7ed3\u679c\u6210\u529f\u4e86\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">package<\/span> <span class=\"n\">main<\/span>\r\n\r\n<span class=\"k\">import<\/span> <span class=\"p\">(<\/span>\r\n    <span class=\"s\">\"golang.org\/x\/tour\/pic\"<\/span>\r\n    <span class=\"s\">\"image\"<\/span>\r\n    <span class=\"s\">\"image\/color\"<\/span>\r\n    <span class=\"p\">)<\/span>\r\n\r\n<span class=\"k\">type<\/span> <span class=\"n\">Image<\/span> <span class=\"k\">struct<\/span><span class=\"p\">{}<\/span>\r\n\r\n<span class=\"c\">\/\/ ColorModel returns the Image's color model.<\/span>\r\n<span class=\"k\">func<\/span> <span class=\"p\">(<\/span><span class=\"n\">img<\/span> <span class=\"n\">Image<\/span><span class=\"p\">)<\/span> <span class=\"n\">ColorModel<\/span><span class=\"p\">()<\/span> <span class=\"n\">color<\/span><span class=\"o\">.<\/span><span class=\"n\">Model<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"n\">color<\/span><span class=\"o\">.<\/span><span class=\"n\">RGBAModel<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"c\">\/\/ Bounds returns the domain for which At can return non-zero color.<\/span>\r\n<span class=\"c\">\/\/ The bounds do not necessarily contain the point (0, 0).<\/span>\r\n<span class=\"k\">func<\/span> <span class=\"p\">(<\/span><span class=\"n\">img<\/span> <span class=\"n\">Image<\/span><span class=\"p\">)<\/span> <span class=\"n\">Bounds<\/span><span class=\"p\">()<\/span> <span class=\"n\">image<\/span><span class=\"o\">.<\/span><span class=\"n\">Rectangle<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"n\">image<\/span><span class=\"o\">.<\/span><span class=\"n\">Rect<\/span><span class=\"p\">(<\/span><span class=\"m\">0<\/span><span class=\"p\">,<\/span> <span class=\"m\">0<\/span><span class=\"p\">,<\/span> <span class=\"m\">100<\/span><span class=\"p\">,<\/span> <span class=\"m\">100<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"c\">\/\/ At returns the color of the pixel at (x, y).<\/span>\r\n<span class=\"c\">\/\/ At(Bounds().Min.X, Bounds().Min.Y) returns the upper-left pixel of the grid.<\/span>\r\n<span class=\"c\">\/\/ At(Bounds().Max.X-1, Bounds().Max.Y-1) returns the lower-right one.<\/span>\r\n<span class=\"k\">func<\/span> <span class=\"p\">(<\/span><span class=\"n\">img<\/span> <span class=\"n\">Image<\/span><span class=\"p\">)<\/span> <span class=\"n\">At<\/span><span class=\"p\">(<\/span><span class=\"n\">x<\/span><span class=\"p\">,<\/span> <span class=\"n\">y<\/span> <span class=\"kt\">int<\/span><span class=\"p\">)<\/span> <span class=\"n\">color<\/span><span class=\"o\">.<\/span><span class=\"n\">Color<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"n\">color<\/span><span class=\"o\">.<\/span><span class=\"n\">RGBA<\/span><span class=\"p\">{<\/span><span class=\"m\">0<\/span><span class=\"p\">,<\/span> <span class=\"m\">0<\/span><span class=\"p\">,<\/span> <span class=\"m\">255<\/span><span class=\"p\">,<\/span> <span class=\"m\">255<\/span><span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<span class=\"k\">func<\/span> <span class=\"n\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">m<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">Image<\/span><span class=\"p\">{}<\/span>\r\n    <span class=\"n\">pic<\/span><span class=\"o\">.<\/span><span class=\"n\">ShowImage<\/span><span class=\"p\">(<\/span><span class=\"n\">m<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"ImageInterface.png\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d56e837434c4406cdb313\/40-0.png\" alt=\"ImageInterface.png\" \/><\/div>\n<h2>2016\u5e7412\u670820\u65e5\u7684\u8bfe\u9898\u662f\u5e76\u884c\u5904\u7406\/\u4e8c\u5206\u6811\u3002<\/h2>\n<p>\u7ec8\u4e8e\u5230\u4e86\u4efb\u52a1\u4e2d\u6700\u5173\u952e\u7684\u5e76\u53d1\u5904\u7406\u95ee\u9898\u3002\u6211\u82b1\u4e86\u5927\u7ea6\u4e09\u5929\u65f6\u95f4\u6765\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u6700\u7ec8\u8fd8\u662f\u653e\u5f03\u4e86\u3002\u867d\u7136\u6211\u5df2\u7ecf\u63a5\u8fd1\u627e\u5230\u89e3\u51b3\u65b9\u6cd5\uff0c\u4f46\u662f\u975e\u5e38\u6cae\u4e27\uff0c\u6240\u4ee5\u6211\u5728\u53e6\u4e00\u7bc7\u6587\u7ae0\u4e2d\u8be6\u7ec6\u5199\u4e86\u8fd9\u4e2a\u60c5\u51b5\u3002<\/p>\n<h2>2016\u5e7412\u670823\u65e5\uff0c\u6700\u540e\u7684\u4efb\u52a1\uff1a\u5e76\u884c\u5904\u7406\/\u7f51\u7edc\u722c\u866b\u3002<\/h2>\n<p>\u867d\u7136\u4e0d\u5bb9\u6613\uff0c\u4f46\u901a\u8fc7\u53c2\u8003\u6742\u5fd7\u6587\u7ae0\u548c\u6559\u7a0b\uff0c\u6211\u505a\u5230\u4e86\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">package<\/span> <span class=\"n\">main<\/span>\r\n\r\n<span class=\"k\">import<\/span> <span class=\"p\">(<\/span>\r\n    <span class=\"s\">\"fmt\"<\/span>\r\n    <span class=\"s\">\"sync\"<\/span>\r\n<span class=\"p\">)<\/span>\r\n\r\n<span class=\"k\">type<\/span> <span class=\"n\">Fetcher<\/span> <span class=\"k\">interface<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"c\">\/\/ Fetch returns the body of URL and<\/span>\r\n    <span class=\"c\">\/\/ a slice of URLs found on that page.<\/span>\r\n    <span class=\"n\">Fetch<\/span><span class=\"p\">(<\/span><span class=\"n\">url<\/span> <span class=\"kt\">string<\/span><span class=\"p\">)<\/span> <span class=\"p\">(<\/span><span class=\"n\">body<\/span> <span class=\"kt\">string<\/span><span class=\"p\">,<\/span> <span class=\"n\">urls<\/span> <span class=\"p\">[]<\/span><span class=\"kt\">string<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span> <span class=\"kt\">error<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"c\">\/\/ Crawl uses fetcher to recursively crawl<\/span>\r\n<span class=\"c\">\/\/ pages starting with url, to a maximum of depth.<\/span>\r\n<span class=\"k\">func<\/span> <span class=\"n\">Crawl<\/span><span class=\"p\">(<\/span><span class=\"n\">url<\/span> <span class=\"kt\">string<\/span><span class=\"p\">,<\/span> <span class=\"n\">depth<\/span> <span class=\"kt\">int<\/span><span class=\"p\">,<\/span> <span class=\"n\">fetcher<\/span> <span class=\"n\">Fetcher<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">c<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">SafeCounter<\/span><span class=\"p\">{<\/span><span class=\"n\">v<\/span><span class=\"o\">:<\/span> <span class=\"nb\">make<\/span><span class=\"p\">(<\/span><span class=\"k\">map<\/span><span class=\"p\">[<\/span><span class=\"kt\">string<\/span><span class=\"p\">]<\/span><span class=\"kt\">int<\/span><span class=\"p\">)}<\/span>\r\n    <span class=\"n\">ch<\/span> <span class=\"o\">:=<\/span> <span class=\"nb\">make<\/span><span class=\"p\">(<\/span><span class=\"k\">chan<\/span> <span class=\"kt\">string<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"k\">go<\/span> <span class=\"n\">InnerCrawl<\/span><span class=\"p\">(<\/span><span class=\"n\">url<\/span><span class=\"p\">,<\/span> <span class=\"n\">depth<\/span><span class=\"p\">,<\/span> <span class=\"n\">fetcher<\/span><span class=\"p\">,<\/span> <span class=\"n\">ch<\/span> <span class=\"p\">,<\/span> <span class=\"o\">&amp;<\/span><span class=\"n\">c<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"s\">\"&lt;-ch\"<\/span><span class=\"p\">,<\/span> <span class=\"o\">&lt;-<\/span><span class=\"n\">ch<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"k\">return<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">InnerCrawl<\/span><span class=\"p\">(<\/span><span class=\"n\">url<\/span> <span class=\"kt\">string<\/span><span class=\"p\">,<\/span> <span class=\"n\">depth<\/span> <span class=\"kt\">int<\/span><span class=\"p\">,<\/span> <span class=\"n\">fetcher<\/span> <span class=\"n\">Fetcher<\/span><span class=\"p\">,<\/span> <span class=\"n\">ch<\/span> <span class=\"k\">chan<\/span> <span class=\"kt\">string<\/span><span class=\"p\">,<\/span> <span class=\"n\">c<\/span> <span class=\"o\">*<\/span><span class=\"n\">SafeCounter<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">c<\/span><span class=\"o\">.<\/span><span class=\"n\">Inc<\/span><span class=\"p\">(<\/span><span class=\"n\">url<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"n\">cnt<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">c<\/span><span class=\"o\">.<\/span><span class=\"n\">Value<\/span><span class=\"p\">(<\/span><span class=\"n\">url<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"k\">if<\/span> <span class=\"n\">cnt<\/span> <span class=\"o\">&gt;<\/span> <span class=\"m\">1<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Printf<\/span><span class=\"p\">(<\/span><span class=\"s\">\"duplicate cnt:%v url:%s<\/span><span class=\"se\">\\n<\/span><span class=\"s\">\"<\/span><span class=\"p\">,<\/span><span class=\"n\">cnt<\/span><span class=\"p\">,<\/span> <span class=\"n\">url<\/span><span class=\"p\">)<\/span>\r\n        <span class=\"n\">ch<\/span> <span class=\"o\">&lt;-<\/span> <span class=\"n\">url<\/span>\r\n        <span class=\"k\">return<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"s\">\"depth:\"<\/span><span class=\"p\">,<\/span><span class=\"n\">depth<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"k\">if<\/span> <span class=\"n\">depth<\/span> <span class=\"o\">&lt;=<\/span> <span class=\"m\">0<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">ch<\/span> <span class=\"o\">&lt;-<\/span> <span class=\"n\">url<\/span>\r\n        <span class=\"k\">return<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"n\">body<\/span><span class=\"p\">,<\/span> <span class=\"n\">urls<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">fetcher<\/span><span class=\"o\">.<\/span><span class=\"n\">Fetch<\/span><span class=\"p\">(<\/span><span class=\"n\">url<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"k\">if<\/span> <span class=\"n\">err<\/span> <span class=\"o\">!=<\/span> <span class=\"no\">nil<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"n\">err<\/span><span class=\"p\">)<\/span>\r\n        <span class=\"n\">ch<\/span> <span class=\"o\">&lt;-<\/span> <span class=\"n\">url<\/span>\r\n        <span class=\"k\">return<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Printf<\/span><span class=\"p\">(<\/span><span class=\"s\">\"found: %s %q<\/span><span class=\"se\">\\n<\/span><span class=\"s\">\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">url<\/span><span class=\"p\">,<\/span> <span class=\"n\">body<\/span><span class=\"p\">)<\/span>\r\n\r\n    <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Printf<\/span><span class=\"p\">(<\/span><span class=\"s\">\"len(urls):%v<\/span><span class=\"se\">\\n<\/span><span class=\"s\">\"<\/span><span class=\"p\">,<\/span> <span class=\"nb\">len<\/span><span class=\"p\">(<\/span><span class=\"n\">urls<\/span><span class=\"p\">))<\/span>\r\n    <span class=\"n\">ich<\/span> <span class=\"o\">:=<\/span> <span class=\"nb\">make<\/span><span class=\"p\">(<\/span><span class=\"k\">chan<\/span> <span class=\"kt\">string<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"k\">for<\/span> <span class=\"n\">_<\/span><span class=\"p\">,<\/span> <span class=\"n\">u<\/span> <span class=\"o\">:=<\/span> <span class=\"k\">range<\/span> <span class=\"n\">urls<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">go<\/span> <span class=\"n\">InnerCrawl<\/span><span class=\"p\">(<\/span><span class=\"n\">u<\/span><span class=\"p\">,<\/span> <span class=\"n\">depth<\/span><span class=\"o\">-<\/span><span class=\"m\">1<\/span><span class=\"p\">,<\/span> <span class=\"n\">fetcher<\/span><span class=\"p\">,<\/span> <span class=\"n\">ich<\/span><span class=\"p\">,<\/span> <span class=\"n\">c<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"k\">for<\/span> <span class=\"n\">i<\/span> <span class=\"o\">:=<\/span> <span class=\"m\">0<\/span><span class=\"p\">;<\/span> <span class=\"n\">i<\/span> <span class=\"o\">&lt;<\/span> <span class=\"nb\">len<\/span><span class=\"p\">(<\/span><span class=\"n\">urls<\/span><span class=\"p\">);<\/span> <span class=\"n\">i<\/span><span class=\"o\">++<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"s\">\"&lt;-ich\"<\/span><span class=\"p\">,<\/span> <span class=\"o\">&lt;-<\/span><span class=\"n\">ich<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"n\">ch<\/span> <span class=\"o\">&lt;-<\/span> <span class=\"n\">url<\/span>\r\n    <span class=\"k\">return<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">Crawl<\/span><span class=\"p\">(<\/span><span class=\"s\">\"http:\/\/golang.org\/\"<\/span><span class=\"p\">,<\/span> <span class=\"m\">4<\/span><span class=\"p\">,<\/span> <span class=\"n\">fetcher<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"c\">\/\/ fakeFetcher is Fetcher that returns canned results.<\/span>\r\n<span class=\"k\">type<\/span> <span class=\"n\">fakeFetcher<\/span> <span class=\"k\">map<\/span><span class=\"p\">[<\/span><span class=\"kt\">string<\/span><span class=\"p\">]<\/span><span class=\"o\">*<\/span><span class=\"n\">fakeResult<\/span>\r\n\r\n<span class=\"k\">type<\/span> <span class=\"n\">fakeResult<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">body<\/span> <span class=\"kt\">string<\/span>\r\n    <span class=\"n\">urls<\/span> <span class=\"p\">[]<\/span><span class=\"kt\">string<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"p\">(<\/span><span class=\"n\">f<\/span> <span class=\"n\">fakeFetcher<\/span><span class=\"p\">)<\/span> <span class=\"n\">Fetch<\/span><span class=\"p\">(<\/span><span class=\"n\">url<\/span> <span class=\"kt\">string<\/span><span class=\"p\">)<\/span> <span class=\"p\">(<\/span><span class=\"kt\">string<\/span><span class=\"p\">,<\/span> <span class=\"p\">[]<\/span><span class=\"kt\">string<\/span><span class=\"p\">,<\/span> <span class=\"kt\">error<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">if<\/span> <span class=\"n\">res<\/span><span class=\"p\">,<\/span> <span class=\"n\">ok<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">f<\/span><span class=\"p\">[<\/span><span class=\"n\">url<\/span><span class=\"p\">];<\/span> <span class=\"n\">ok<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"n\">res<\/span><span class=\"o\">.<\/span><span class=\"n\">body<\/span><span class=\"p\">,<\/span> <span class=\"n\">res<\/span><span class=\"o\">.<\/span><span class=\"n\">urls<\/span><span class=\"p\">,<\/span> <span class=\"no\">nil<\/span>\r\n    <span class=\"p\">}<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"s\">\"\"<\/span><span class=\"p\">,<\/span> <span class=\"no\">nil<\/span><span class=\"p\">,<\/span> <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Errorf<\/span><span class=\"p\">(<\/span><span class=\"s\">\"not found: %s\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">url<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"c\">\/\/ fetcher is a populated fakeFetcher.<\/span>\r\n<span class=\"k\">var<\/span> <span class=\"n\">fetcher<\/span> <span class=\"o\">=<\/span> <span class=\"n\">fakeFetcher<\/span><span class=\"p\">{<\/span>\r\n    <span class=\"s\">\"http:\/\/golang.org\/\"<\/span><span class=\"o\">:<\/span> <span class=\"o\">&amp;<\/span><span class=\"n\">fakeResult<\/span><span class=\"p\">{<\/span>\r\n        <span class=\"s\">\"The Go Programming Language\"<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"p\">[]<\/span><span class=\"kt\">string<\/span><span class=\"p\">{<\/span>\r\n            <span class=\"s\">\"http:\/\/golang.org\/pkg\/\"<\/span><span class=\"p\">,<\/span>\r\n            <span class=\"s\">\"http:\/\/golang.org\/cmd\/\"<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"p\">},<\/span>\r\n    <span class=\"p\">},<\/span>\r\n    <span class=\"s\">\"http:\/\/golang.org\/pkg\/\"<\/span><span class=\"o\">:<\/span> <span class=\"o\">&amp;<\/span><span class=\"n\">fakeResult<\/span><span class=\"p\">{<\/span>\r\n        <span class=\"s\">\"Packages\"<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"p\">[]<\/span><span class=\"kt\">string<\/span><span class=\"p\">{<\/span>\r\n            <span class=\"s\">\"http:\/\/golang.org\/\"<\/span><span class=\"p\">,<\/span>\r\n            <span class=\"s\">\"http:\/\/golang.org\/cmd\/\"<\/span><span class=\"p\">,<\/span>\r\n            <span class=\"s\">\"http:\/\/golang.org\/pkg\/fmt\/\"<\/span><span class=\"p\">,<\/span>\r\n            <span class=\"s\">\"http:\/\/golang.org\/pkg\/os\/\"<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"p\">},<\/span>\r\n    <span class=\"p\">},<\/span>\r\n    <span class=\"s\">\"http:\/\/golang.org\/pkg\/fmt\/\"<\/span><span class=\"o\">:<\/span> <span class=\"o\">&amp;<\/span><span class=\"n\">fakeResult<\/span><span class=\"p\">{<\/span>\r\n        <span class=\"s\">\"Package fmt\"<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"p\">[]<\/span><span class=\"kt\">string<\/span><span class=\"p\">{<\/span>\r\n            <span class=\"s\">\"http:\/\/golang.org\/\"<\/span><span class=\"p\">,<\/span>\r\n            <span class=\"s\">\"http:\/\/golang.org\/pkg\/\"<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"p\">},<\/span>\r\n    <span class=\"p\">},<\/span>\r\n    <span class=\"s\">\"http:\/\/golang.org\/pkg\/os\/\"<\/span><span class=\"o\">:<\/span> <span class=\"o\">&amp;<\/span><span class=\"n\">fakeResult<\/span><span class=\"p\">{<\/span>\r\n        <span class=\"s\">\"Package os\"<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"p\">[]<\/span><span class=\"kt\">string<\/span><span class=\"p\">{<\/span>\r\n            <span class=\"s\">\"http:\/\/golang.org\/\"<\/span><span class=\"p\">,<\/span>\r\n            <span class=\"s\">\"http:\/\/golang.org\/pkg\/\"<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"p\">},<\/span>\r\n    <span class=\"p\">},<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"c\">\/\/ SafeCounter is safe to use concurrently.<\/span>\r\n<span class=\"k\">type<\/span> <span class=\"n\">SafeCounter<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">v<\/span>   <span class=\"k\">map<\/span><span class=\"p\">[<\/span><span class=\"kt\">string<\/span><span class=\"p\">]<\/span><span class=\"kt\">int<\/span>\r\n    <span class=\"n\">mux<\/span> <span class=\"n\">sync<\/span><span class=\"o\">.<\/span><span class=\"n\">Mutex<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"c\">\/\/ Inc increments the counter for the given key.<\/span>\r\n<span class=\"k\">func<\/span> <span class=\"p\">(<\/span><span class=\"n\">c<\/span> <span class=\"o\">*<\/span><span class=\"n\">SafeCounter<\/span><span class=\"p\">)<\/span> <span class=\"n\">Inc<\/span><span class=\"p\">(<\/span><span class=\"n\">key<\/span> <span class=\"kt\">string<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">c<\/span><span class=\"o\">.<\/span><span class=\"n\">mux<\/span><span class=\"o\">.<\/span><span class=\"n\">Lock<\/span><span class=\"p\">()<\/span>\r\n    <span class=\"c\">\/\/ Lock so only one goroutine at a time can access the map c.v.<\/span>\r\n    <span class=\"n\">c<\/span><span class=\"o\">.<\/span><span class=\"n\">v<\/span><span class=\"p\">[<\/span><span class=\"n\">key<\/span><span class=\"p\">]<\/span><span class=\"o\">++<\/span>\r\n    <span class=\"n\">c<\/span><span class=\"o\">.<\/span><span class=\"n\">mux<\/span><span class=\"o\">.<\/span><span class=\"n\">Unlock<\/span><span class=\"p\">()<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"c\">\/\/ Value returns the current value of the counter for the given key.<\/span>\r\n<span class=\"k\">func<\/span> <span class=\"p\">(<\/span><span class=\"n\">c<\/span> <span class=\"o\">*<\/span><span class=\"n\">SafeCounter<\/span><span class=\"p\">)<\/span> <span class=\"n\">Value<\/span><span class=\"p\">(<\/span><span class=\"n\">key<\/span> <span class=\"kt\">string<\/span><span class=\"p\">)<\/span> <span class=\"kt\">int<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">c<\/span><span class=\"o\">.<\/span><span class=\"n\">mux<\/span><span class=\"o\">.<\/span><span class=\"n\">Lock<\/span><span class=\"p\">()<\/span>\r\n    <span class=\"c\">\/\/ Lock so only one goroutine at a time can access the map c.v.<\/span>\r\n    <span class=\"k\">defer<\/span> <span class=\"n\">c<\/span><span class=\"o\">.<\/span><span class=\"n\">mux<\/span><span class=\"o\">.<\/span><span class=\"n\">Unlock<\/span><span class=\"p\">()<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"n\">c<\/span><span class=\"o\">.<\/span><span class=\"n\">v<\/span><span class=\"p\">[<\/span><span class=\"n\">key<\/span><span class=\"p\">]<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c<\/p>\n<pre class=\"post-pre\"><code>found: http:\/\/golang.org\/ \"The Go Programming Language\"\r\nnot found: http:\/\/golang.org\/cmd\/\r\n&lt;-ich http:\/\/golang.org\/cmd\/\r\nfound: http:\/\/golang.org\/pkg\/ \"Packages\"\r\nfound: http:\/\/golang.org\/pkg\/os\/ \"Package os\"\r\nduplicate cnt:2 url:http:\/\/golang.org\/pkg\/\r\n&lt;-ich http:\/\/golang.org\/pkg\/\r\nduplicate cnt:2 url:http:\/\/golang.org\/\r\n&lt;-ich http:\/\/golang.org\/\r\nduplicate cnt:2 url:http:\/\/golang.org\/cmd\/\r\n&lt;-ich http:\/\/golang.org\/cmd\/\r\nfound: http:\/\/golang.org\/pkg\/fmt\/ \"Package fmt\"\r\nduplicate cnt:3 url:http:\/\/golang.org\/pkg\/\r\n&lt;-ich http:\/\/golang.org\/pkg\/\r\nduplicate cnt:3 url:http:\/\/golang.org\/\r\n&lt;-ich http:\/\/golang.org\/\r\n&lt;-ich http:\/\/golang.org\/pkg\/os\/\r\nduplicate cnt:4 url:http:\/\/golang.org\/\r\n&lt;-ich http:\/\/golang.org\/\r\n&lt;-ich http:\/\/golang.org\/pkg\/fmt\/\r\n&lt;-ich http:\/\/golang.org\/pkg\/\r\n&lt;-ch http:\/\/golang.org\/\r\n<\/code><\/pre>\n<h2>\u603b\u7ed3<\/h2>\n<p>\u8fd9\u5c31\u7ed3\u675f\u4e86\u3002\u5982\u679c\u5199\u4e86\u5947\u602a\u7684\u4ee3\u7801\uff0c\u8bf7\u6307\u51fa\u6765\uff0c\u8c22\u8c22\u4f60\u3002<\/p>\n<p>Playground\u4fdd\u5b58\u4e86\u4ee3\u7801\uff0c\u975e\u5e38\u65b9\u4fbf\u3002\u4f46\u662f\u5728\u5199\u8fd9\u7bc7\u6587\u7ae0\u7684\u8fc7\u7a0b\u4e2d\uff0c\u56de\u987e\u8fc7\u53bb\u7684\u4ee3\u7801\u65f6\u53d1\u73b0\u5b8c\u5168\u6ca1\u6709\u8bb0\u5fc6\uff0c\u6240\u4ee5\u603b\u4f53\u800c\u8a00<\/p>\n<p>\u8ba9\u6211\u4eec\u7559\u4e0b\u8bc4\u8bba\u3002<\/p>\n<p>\u4ee5\u4e0a\u3001\u6211\u5728\u73b0\u573a\uff08\u6240\u89c1\uff09\u7684\u56de\u62a5\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6211\u82b1\u4e86\u5927\u7ea6\u4e00\u4e2a\u6708\u7684\u65f6\u95f4\u5b8c\u6210\u4e86Go\u8bed\u8a00\u7684\u6559\u7a0b\u300aA Tour of Go\u300b\u3002\u6211\u4f7f\u7528\u7684\u6267\u884c\u73af\u5883\u53ea\u662f\u8be5\u7f51\u7ad9\u5185\u7684play [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-44097","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u5b8c\u6210\u300aA Tour of Go\u300b\u7684\u5b66\u4e60 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u5b8c\u6210\u300aa-tour-of-go\u300b\u7684\u5b66\u4e60\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u5b8c\u6210\u300aA Tour of 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