{"id":44269,"date":"2023-03-20T01:37:11","date_gmt":"2023-09-25T03:36:04","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8go%e8%af%ad%e8%a8%80%e8%a7%a3%e6%9e%90jsonp\/"},"modified":"2024-04-29T19:43:12","modified_gmt":"2024-04-29T11:43:12","slug":"%e4%bd%bf%e7%94%a8go%e8%af%ad%e8%a8%80%e8%a7%a3%e6%9e%90jsonp","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8go%e8%af%ad%e8%a8%80%e8%a7%a3%e6%9e%90jsonp\/","title":{"rendered":"\u4f7f\u7528Go\u8bed\u8a00\u89e3\u6790JSONP"},"content":{"rendered":"<h2>\u6211\u8981\u5982\u4f55\u89e3\u6790JSONP\uff1f<\/h2>\n<blockquote class=\"reddit-embed-bq\" style=\"height:316px\" ><p><a href=\"https:\/\/www.reddit.com\/r\/golang\/comments\/a1oqxp\/how_would_i_parse_jsonp\/\">How would I parse JSONP?<\/a><br \/> by<a href=\"https:\/\/www.reddit.com\/user\/SamosasAndCoffee\/\">u\/SamosasAndCoffee<\/a> in<a href=\"https:\/\/www.reddit.com\/r\/golang\/\">golang<\/a><\/p><\/blockquote>\n<p><script async src=\"https:\/\/embed.reddit.com\/widgets.js\" charset=\"UTF-8\"><\/script><br \/>\n\u8fd9\u7bc7\u6587\u7ae0\u8ba8\u8bba\u4e86\u5982\u4f55\u5c06\u8fd4\u56de\u7684\u6570\u636e\u4ece\u5305\u542b\u56de\u8c03\u51fd\u6570\u7684JSONP\u683c\u5f0f\u8f6c\u6362\u6210JSON\uff0c\u7136\u540e\u518d\u8f6c\u6362\u6210\u7ed3\u6784\u4f53\u7684\u95ee\u9898\u3002<\/p>\n<p>1) \u6211\u6b63\u5728\u5403\u665a\u9910\u3002<br \/>\n(W\u01d2 ch\u012b .)<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">func<\/span> <span class=\"n\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"n\">jsonpStr<\/span> <span class=\"o\">:=<\/span> <span class=\"s\">`\r\n  callback({\r\n    \"hello\": \"world!!\",\r\n    \"num\": 123456\r\n  });`<\/span>\r\n\r\n  <span class=\"k\">var<\/span> <span class=\"n\">v<\/span> <span class=\"k\">interface<\/span><span class=\"p\">{}<\/span>\r\n  <span class=\"n\">err<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">json<\/span><span class=\"o\">.<\/span><span class=\"n\">Unmarshal<\/span><span class=\"p\">(<\/span><span class=\"n\">jsonpStr<\/span><span class=\"p\">,<\/span> <span class=\"o\">&amp;<\/span><span class=\"n\">v<\/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=\"c\">\/\/ invalid character 'c' looking for beginning of value<\/span>\r\n  <span class=\"c\">\/\/ JSON\u3092\u671f\u5f85\u3057\u3066\u3044\u308b\u306e\u306b\u5148\u982d\u306bcallback\u3068\u3044\u3046\u4e0d\u8981\u306a\u6587\u5b57\u5217\u304c\u3042\u308b\u305f\u3081Unmarshal\u304c\u30a8\u30e9\u30fc\u3092\u8fd4\u3057\u307e\u3059\u3002<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u5e94\u5bf9\u65b9\u6cd5<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4ecereddit\u5e16\u5b50\u7684\u56de\u7b54\u4e2d\u9009\u62e9\u7684\u4e24\u4e2a\u4f8b\u5b50\u3002<\/p>\n<h3>\u8bf7\u63d0\u4f9b\u4e00\u79cdtitpetric\u5148\u751f\u7684\u89e3\u51b3\u65b9\u5f0f\u3002<\/h3>\n<p>\u8fd9\u662f\u4e00\u79cd\u4ece\u5934\u5f00\u59cb\uff08\u5230\u5c3e\u90e8\uff0c\u4ee5\u53ca\u4ece\u5c3e\u90e8\u5f00\u59cb\uff09\u7528\u201ctrim\u201d\u6765\u5904\u7406\u7684\u65b9\u6cd5\uff0cYO\uff01<\/p>\n<pre class=\"post-pre\"><code>    <span class=\"n\">jsonpStr<\/span> <span class=\"o\">:=<\/span> <span class=\"s\">`callback({\r\n      \"hello\": \"world!!\",\r\n      \"num\": 123456\r\n    });`<\/span>\r\n\r\n    <span class=\"n\">jsonStr<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">jsonpStr<\/span><span class=\"p\">[<\/span><span class=\"n\">strings<\/span><span class=\"o\">.<\/span><span class=\"n\">Index<\/span><span class=\"p\">(<\/span><span class=\"n\">jsonpStr<\/span><span class=\"p\">,<\/span> <span class=\"s\">\"(\"<\/span><span class=\"p\">)<\/span><span class=\"o\">+<\/span><span class=\"m\">1<\/span> <span class=\"o\">:<\/span> <span class=\"n\">strings<\/span><span class=\"o\">.<\/span><span class=\"n\">Index<\/span><span class=\"p\">(<\/span><span class=\"n\">jsonpStr<\/span><span class=\"p\">,<\/span> <span class=\"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\">jsonStr<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"c\">\/\/ {<\/span>\r\n    <span class=\"c\">\/\/  \"hello\": \"world!!\",<\/span>\r\n    <span class=\"c\">\/\/  \"num\": 123456<\/span>\r\n    <span class=\"c\">\/\/ }<\/span>\r\n\r\n    <span class=\"k\">var<\/span> <span class=\"n\">v<\/span> <span class=\"k\">interface<\/span><span class=\"p\">{}<\/span>\r\n    <span class=\"n\">json<\/span><span class=\"o\">.<\/span><span class=\"n\">Unmarshal<\/span><span class=\"p\">([]<\/span><span class=\"kt\">byte<\/span><span class=\"p\">(<\/span><span class=\"n\">jsonStr<\/span><span class=\"p\">),<\/span> <span class=\"o\">&amp;<\/span><span class=\"n\">v<\/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\">\"%+v\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">v<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"c\">\/\/ map[hello:world!! num:123456]<\/span>\r\n<\/code><\/pre>\n<h3>jerf\u5148\u751f\u7684\u5e94\u5bf9\u65b9\u5f0f<\/h3>\n<p>\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4e00\u7a2e\u540d\u70ba\u300cYO!\u300d\u7684\u65b9\u6cd5\u4f86\u4f5c\u70baio.Reader\u7684\u5305\u88dd\u5668\u3002<\/p>\n<pre class=\"post-pre\"><code>\r\n<span class=\"k\">type<\/span> <span class=\"n\">JSONPWrapper<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">Prefix<\/span>     <span class=\"kt\">string<\/span>\r\n    <span class=\"n\">Underlying<\/span> <span class=\"n\">io<\/span><span class=\"o\">.<\/span><span class=\"n\">Reader<\/span>\r\n\r\n    <span class=\"n\">gotPrefix<\/span> <span class=\"kt\">bool<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"p\">(<\/span><span class=\"n\">jpw<\/span> <span class=\"o\">*<\/span><span class=\"n\">JSONPWrapper<\/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\">if<\/span> <span class=\"n\">jpw<\/span><span class=\"o\">.<\/span><span class=\"n\">gotPrefix<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"n\">jpw<\/span><span class=\"o\">.<\/span><span class=\"n\">Underlying<\/span><span class=\"o\">.<\/span><span class=\"n\">Read<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"n\">prefix<\/span> <span class=\"o\">:=<\/span> <span class=\"nb\">make<\/span><span class=\"p\">([]<\/span><span class=\"kt\">byte<\/span><span class=\"p\">,<\/span> <span class=\"nb\">len<\/span><span class=\"p\">(<\/span><span class=\"n\">jpw<\/span><span class=\"o\">.<\/span><span class=\"n\">Prefix<\/span><span class=\"p\">))<\/span>\r\n    <span class=\"n\">n<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">io<\/span><span class=\"o\">.<\/span><span class=\"n\">ReadFull<\/span><span class=\"p\">(<\/span><span class=\"n\">jpw<\/span><span class=\"o\">.<\/span><span class=\"n\">Underlying<\/span><span class=\"p\">,<\/span> <span class=\"n\">prefix<\/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=\"k\">return<\/span> <span class=\"n\">n<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"k\">if<\/span> <span class=\"kt\">string<\/span><span class=\"p\">(<\/span><span class=\"n\">prefix<\/span><span class=\"p\">)<\/span> <span class=\"o\">!=<\/span> <span class=\"n\">jpw<\/span><span class=\"o\">.<\/span><span class=\"n\">Prefix<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"n\">n<\/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\">\"JSONP prefix mismatch: expected %q, got %q\"<\/span><span class=\"p\">,<\/span>\r\n            <span class=\"n\">jpw<\/span><span class=\"o\">.<\/span><span class=\"n\">Prefix<\/span><span class=\"p\">,<\/span> <span class=\"n\">prefix<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"c\">\/\/ read until the (; in general, this should just be one read<\/span>\r\n    <span class=\"n\">char<\/span> <span class=\"o\">:=<\/span> <span class=\"nb\">make<\/span><span class=\"p\">([]<\/span><span class=\"kt\">byte<\/span><span class=\"p\">,<\/span> <span class=\"m\">1<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"k\">for<\/span> <span class=\"n\">char<\/span><span class=\"p\">[<\/span><span class=\"m\">0<\/span><span class=\"p\">]<\/span> <span class=\"o\">!=<\/span> <span class=\"sc\">'('<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">n<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span> <span class=\"o\">=<\/span> <span class=\"n\">jpw<\/span><span class=\"o\">.<\/span><span class=\"n\">Underlying<\/span><span class=\"o\">.<\/span><span class=\"n\">Read<\/span><span class=\"p\">(<\/span><span class=\"n\">char<\/span><span class=\"p\">)<\/span>\r\n        <span class=\"k\">if<\/span> <span class=\"n\">n<\/span> <span class=\"o\">==<\/span> <span class=\"m\">0<\/span> <span class=\"o\">||<\/span> <span class=\"n\">err<\/span> <span class=\"o\">!=<\/span> <span class=\"no\">nil<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"k\">return<\/span> <span class=\"n\">n<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span>\r\n        <span class=\"p\">}<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"c\">\/\/ We've now consumed the JSONP prefix.<\/span>\r\n    <span class=\"n\">jpw<\/span><span class=\"o\">.<\/span><span class=\"n\">gotPrefix<\/span> <span class=\"o\">=<\/span> <span class=\"no\">true<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"n\">jpw<\/span><span class=\"o\">.<\/span><span class=\"n\">Underlying<\/span><span class=\"o\">.<\/span><span class=\"n\">Read<\/span><span class=\"p\">(<\/span><span class=\"n\">b<\/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\">jsonpStr<\/span> <span class=\"o\">:=<\/span> <span class=\"s\">`callback({\r\n      \"hello\": \"world!!\",\r\n      \"num\": 123456\r\n    });`<\/span>\r\n    <span class=\"n\">prefix<\/span> <span class=\"o\">:=<\/span> <span class=\"s\">\"callback\"<\/span>\r\n    <span class=\"n\">jsonp<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">bytes<\/span><span class=\"o\">.<\/span><span class=\"n\">NewBuffer<\/span><span class=\"p\">([]<\/span><span class=\"kt\">byte<\/span><span class=\"p\">(<\/span><span class=\"n\">jsonpStr<\/span><span class=\"p\">))<\/span>\r\n    <span class=\"k\">var<\/span> <span class=\"n\">decoded<\/span> <span class=\"k\">interface<\/span><span class=\"p\">{}<\/span>\r\n    <span class=\"n\">decoder<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">json<\/span><span class=\"o\">.<\/span><span class=\"n\">NewDecoder<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"n\">JSONPWrapper<\/span><span class=\"p\">{<\/span><span class=\"n\">Prefix<\/span><span class=\"o\">:<\/span> <span class=\"n\">prefix<\/span><span class=\"p\">,<\/span> <span class=\"n\">Underlying<\/span><span class=\"o\">:<\/span> <span class=\"n\">jsonp<\/span><span class=\"p\">})<\/span>\r\n\r\n    <span class=\"c\">\/\/ This code depends on the fact the JSON parser stops when it<\/span>\r\n    <span class=\"c\">\/\/ finishes a JSON object, so we don't have to handle the concluding<\/span>\r\n    <span class=\"c\">\/\/ paren.<\/span>\r\n    <span class=\"n\">decoder<\/span><span class=\"o\">.<\/span><span class=\"n\">Decode<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"n\">decoded<\/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\">decoded<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"c\">\/\/ map[hello:world!! num:123456]<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u8c03\u7528 `json.NewDecoder` \u65f6\uff0c\u5c06 `JSONPWrapper`\uff08\u6ee1\u8db3 `io.Reader` \u63a5\u53e3\u7684\u5bf9\u8c61\uff09\u4f5c\u4e3a\u53c2\u6570\u4f20\u5165\uff0c\u8fd9\u5c06\u5728\u8c03\u7528 `decoder.Decode` \u7684\u65f6\u5019\u6267\u884c `JSONWrapper.Read()` \u65b9\u6cd5\u3002<br \/>\n\u5728 `JSONWrapper.Read()` \u65b9\u6cd5\u4e2d\uff0c\u4f1a\u5c06\u8bbe\u7f6e\u7684\u524d\u7f00\u5b57\u7b26\u4e32\u4e0e JSONP \u5b57\u7b26\u4e32\u7684\u5f00\u5934\u8fdb\u884c\u6bd4\u8f83\uff0c\u5e76\u5c06\u5176\u5220\u9664\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6211\u8981\u5982\u4f55\u89e3\u6790JSONP\uff1f How would I parse JSONP? byu\/SamosasAndCof [&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-44269","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>\u4f7f\u7528Go\u8bed\u8a00\u89e3\u6790JSONP - 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\" 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