{"id":1128,"date":"2024-12-28T12:30:37","date_gmt":"2024-12-28T03:30:37","guid":{"rendered":"https:\/\/route-zero.com\/recruit\/route\/1128\/"},"modified":"2025-04-04T12:38:44","modified_gmt":"2025-04-04T03:38:44","slug":"1128","status":"publish","type":"route","link":"https:\/\/route-zero.com\/recruit\/route\/1128\/","title":{"rendered":"JavaScript\u306eAjax\u5b8c\u5168\u5165\u9580\uff5cfetch\u306e\u4f7f\u3044\u65b9\u30fbCORS\u30a8\u30e9\u30fc\u306e\u5bfe\u51e6\u30fb\u975e\u540c\u671f\u901a\u4fe1\u306e\u57fa\u672c\u3092\u89e3\u8aac"},"content":{"rendered":"<div>\n<h2>Ajax\u304c\u3046\u307e\u304f\u52d5\u304b\u306a\u3044\uff1f\u3088\u304f\u3042\u308b\u30c8\u30e9\u30d6\u30eb\u306e\u6b63\u4f53\u3068\u306f<\/h2>\n<p>\u300c\u30dc\u30bf\u30f3\u3092\u62bc\u3057\u3066\u3082\u53cd\u5fdc\u304c\u306a\u3044\u300d\u300c\u30a8\u30e9\u30fc\u306f\u51fa\u306a\u3044\u3051\u3069\u30c7\u30fc\u30bf\u304c\u6765\u306a\u3044\u300d\u2500\u2500<br \/>\u3042\u306a\u305f\u306fJavaScript\u3067Ajax\u901a\u4fe1\u3092\u4f7f\u3063\u305f\u3068\u304d\u3001\u3053\u3093\u306a\u7d4c\u9a13\u3092\u3057\u305f\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u304b\uff1f<\/p>\n<p>Ajax\u306f\u975e\u540c\u671f\u901a\u4fe1\u3092\u53ef\u80fd\u306b\u3059\u308b\u5f37\u529b\u306a\u6a5f\u80fd\u3067\u3059\u304c\u3001<strong>\u5b9f\u969b\u306b\u4f7f\u3044\u59cb\u3081\u308b\u3068\u3064\u307e\u305a\u304d\u3084\u3059\u3044\u30dd\u30a4\u30f3\u30c8\u304c\u591a\u3044<\/strong>\u306e\u3082\u4e8b\u5b9f\u3067\u3059\u3002\u7279\u306b\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u554f\u984c\u304c\u591a\u767a\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>\n<p>\u30ea\u30af\u30a8\u30b9\u30c8\u306f\u9001\u3063\u3066\u3044\u308b\u306e\u306b\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u8fd4\u3063\u3066\u3053\u306a\u3044<\/p>\n<\/li>\n<li>\n<p>CORS\u30a8\u30e9\u30fc\u3067\u30d6\u30ed\u30c3\u30af\u3055\u308c\u3066\u3057\u307e\u3046<\/p>\n<\/li>\n<li>\n<p>\u30b5\u30fc\u30d0\u30fc\u5074\u3067\u306f\u30ea\u30af\u30a8\u30b9\u30c8\u304c\u5c4a\u3044\u3066\u3044\u306a\u3044<\/p>\n<\/li>\n<li>\n<p>\u30d8\u30c3\u30c0\u30fc\u3084\u30dc\u30c7\u30a3\u306e\u6271\u3044\u304c\u5206\u304b\u3089\u306a\u3044<\/p>\n<\/li>\n<\/ul>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u3053\u3046\u3057\u305f<strong>Ajax\u901a\u4fe1\u306b\u95a2\u3059\u308b\u30c8\u30e9\u30d6\u30eb\u306e\u539f\u56e0\u3068\u5bfe\u51e6\u6cd5<\/strong>\u3092\u3001\u5b9f\u4f8b\u3068\u5171\u306b\u5fb9\u5e95\u7684\u306b\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<hr>\n<h2>Ajax\u901a\u4fe1\u306e\u57fa\u672c\u3068\u69cb\u9020\u3092\u7406\u89e3\u3057\u3088\u3046<\/h2>\n<h3>Ajax\u3068\u306f\uff1f<\/h3>\n<p>Ajax\uff08Asynchronous JavaScript and XML\uff09\u306f\u3001\u30da\u30fc\u30b8\u3092\u518d\u8aad\u307f\u8fbc\u307f\u305b\u305a\u306b\u975e\u540c\u671f\u3067\u30c7\u30fc\u30bf\u3092\u9001\u53d7\u4fe1\u3067\u304d\u308b\u6280\u8853\u3067\u3059\u3002\u57fa\u672c\u7684\u306b\u306f XMLHttpRequest \u307e\u305f\u306f fetch() \u3092\u4f7f\u3063\u3066\u5b9f\u88c5\u3057\u307e\u3059\u3002<\/p>\n<h3>\u57fa\u672c\u306eAjax\u30b3\u30fc\u30c9\uff08fetch\u306e\u4f8b\uff09<\/h3>\n<pre><code>fetch(<span>'https:\/\/api.example.com\/data'<\/span>, {\r\n  <span>method<\/span>: <span>'POST'<\/span>,\r\n  <span>headers<\/span>: {\r\n    <span>'Content-Type'<\/span>: <span>'application\/json'<\/span>\r\n  },\r\n  <span>body<\/span>: <span>JSON<\/span>.stringify({ <span>userId<\/span>: <span>123<\/span> })\r\n})\r\n  .then(<span><span>response<\/span> =&gt;<\/span> response.json())\r\n  .then(<span><span>data<\/span> =&gt;<\/span> <span>console<\/span>.log(data))\r\n  .catch(<span><span>error<\/span> =&gt;<\/span> <span>console<\/span>.error(<span>'\u901a\u4fe1\u30a8\u30e9\u30fc:'<\/span>, error));<\/code><\/pre>\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001headers \u306b Content-Type \u3092\u6307\u5b9a\u3057\u3001body \u306b\u306fJSON\u5f62\u5f0f\u306e\u30c7\u30fc\u30bf\u3092\u9001\u4fe1\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<hr>\n<h3>header\u3068body\u306e\u5f79\u5272<\/h3>\n<ul>\n<li>\n<p><strong>headers<\/strong>\uff1a\u901a\u4fe1\u306b\u95a2\u3059\u308b\u30e1\u30bf\u60c5\u5831\u3092\u6e21\u3057\u307e\u3059\u3002\u4f8b\uff1a\u8a8d\u8a3c\u30c8\u30fc\u30af\u30f3\u3001\u30c7\u30fc\u30bf\u306e\u7a2e\u985e\uff08Content-Type\uff09\u306a\u3069\u3002<\/p>\n<\/li>\n<li>\n<p><strong>body<\/strong>\uff1aPOST\u30fbPUT\u6642\u306b\u9001\u308b\u5b9f\u969b\u306e\u30c7\u30fc\u30bf\u672c\u4f53\u3002GET\u30ea\u30af\u30a8\u30b9\u30c8\u3067\u306f\u901a\u5e38\u4f7f\u7528\u3057\u307e\u305b\u3093\u3002<\/p>\n<\/li>\n<\/ul>\n<hr>\n<h3>\u30b5\u30fc\u30d0\u30fc\u3067\u53d7\u4fe1\u3067\u304d\u3066\u3044\u308b\u304b\u306e\u78ba\u8a8d\u65b9\u6cd5<\/h3>\n<p><strong>Node.js\uff08Express\uff09\u306e\u4f8b\uff1a<\/strong><\/p>\n<pre><code>app.post(<span>'\/data'<\/span>, <span>(<span>req, res<\/span>) =&gt;<\/span> {\r\n  <span>console<\/span>.log(<span>'\u53d7\u4fe1\u30c7\u30fc\u30bf:'<\/span>, req.body); <span>\/\/ \u3053\u3053\u3067\u78ba\u8a8d<\/span>\r\n  res.json({ message: <span>'OK'<\/span> });\r\n});<\/code><\/pre>\n<p>\u958b\u767a\u74b0\u5883\u3067\u78ba\u8a8d\u3059\u308b\u306b\u306f\u3001<strong>\u30b5\u30fc\u30d0\u30fc\u30ed\u30b0\u306b\u51fa\u529b<\/strong>\u3057\u305f\u308a\u3001<strong>\u30d6\u30e9\u30a6\u30b6\u306e\u958b\u767a\u8005\u30c4\u30fc\u30eb\uff08\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30bf\u30d6\uff09<\/strong>\u3067\u901a\u4fe1\u5185\u5bb9\u3092\u78ba\u8a8d\u3059\u308b\u306e\u304c\u52b9\u679c\u7684\u3067\u3059\u3002<\/p>\n<hr>\n<h2>\u3046\u307e\u304f\u52d5\u304b\u306a\u3044\u6642\u306e\u539f\u56e0\u3068\u5bfe\u51e6\u6cd5<\/h2>\n<h3>\u3010\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc1\u3011CORS\u30dd\u30ea\u30b7\u30fc\u9055\u53cd<\/h3>\n<p>\u300cAccess to fetch at &#8216;https:\/\/api.example.com&#8217; from origin &#8216;http:\/\/localhost:3000&#8217; has been blocked by CORS policy&#8230;\u300d<\/p>\n<p>\u3053\u306e\u30a8\u30e9\u30fc\u3092\u898b\u305f\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u304b\uff1f<\/p>\n<p>\u539f\u56e0\uff1a<\/p>\n<p>CORS\uff08\u30af\u30ed\u30b9\u30aa\u30ea\u30b8\u30f3\u30ea\u30bd\u30fc\u30b9\u5171\u6709\uff09\u30dd\u30ea\u30b7\u30fc\u306b\u3088\u308a\u3001\u7570\u306a\u308b\u30c9\u30e1\u30a4\u30f3\u9593\u306e\u901a\u4fe1\u304c\u5236\u9650\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3002<\/p>\n<p>\u5bfe\u51e6\u6cd5\uff08\u30b5\u30fc\u30d0\u30fc\u5074\uff09\uff1a<\/p>\n<p>\u30b5\u30fc\u30d0\u30fc\u3067\u9069\u5207\u306aCORS\u8a2d\u5b9a\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n<p><strong>Node.js\uff08Express + cors\u30d1\u30c3\u30b1\u30fc\u30b8\uff09\u306e\u4f8b\uff1a<\/strong><\/p>\n<pre><code><span>const<\/span> cors = <span>require<\/span>(<span>'cors'<\/span>);\r\napp.<span>use<\/span>(cors({\r\n  origin: <span>'http:\/\/localhost:3000'<\/span>, <span>\/\/ \u8a31\u53ef\u3059\u308b\u30aa\u30ea\u30b8\u30f3<\/span>\r\n  credentials: <span>true<\/span>\r\n}));<\/code><\/pre>\n<hr>\n<h3>\u3010\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc2\u3011\u30b9\u30c6\u30fc\u30bf\u30b9\u30b3\u30fc\u30c9200\u306a\u306e\u306b\u30c7\u30fc\u30bf\u304c\u53d6\u308c\u306a\u3044<\/h3>\n<p>\u539f\u56e0\uff1a<\/p>\n<ul>\n<li>\n<p>response.json() \u306e\u524d\u306b response.ok \u3092\u78ba\u8a8d\u3057\u3066\u3044\u306a\u3044<\/p>\n<\/li>\n<li>\n<p>\u30b5\u30fc\u30d0\u30fc\u304cJSON\u3067\u306f\u306a\u304fHTML\u3084\u30c6\u30ad\u30b9\u30c8\u3092\u8fd4\u3057\u3066\u3044\u308b<\/p>\n<\/li>\n<\/ul>\n<p>\u89e3\u6c7a\u7b56\uff1a<\/p>\n<pre><code>fetch(url)\r\n  .then(<span><span>response<\/span> =&gt;<\/span> {\r\n    <span>if<\/span> (!response.ok) <span>throw<\/span> <span>new<\/span> <span>Error<\/span>(<span>'HTTP\u30a8\u30e9\u30fc: '<\/span> + response.status);\r\n    <span>return<\/span> response.json();\r\n  })\r\n  .then(<span><span>data<\/span> =&gt;<\/span> <span>console<\/span>.log(data))\r\n  .catch(<span><span>err<\/span> =&gt;<\/span> <span>console<\/span>.error(err));<\/code><\/pre>\n<hr>\n<h3>\u3010\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc3\u3011\u30b5\u30fc\u30d0\u30fc\u306b\u30c7\u30fc\u30bf\u304c\u5c4a\u3044\u3066\u3044\u306a\u3044<\/h3>\n<p>\u539f\u56e0\uff1a<\/p>\n<ul>\n<li>\n<p>Content-Type \u304c\u4e0d\u6b63<\/p>\n<\/li>\n<li>\n<p>body \u304c\u672a\u8a2d\u5b9a\u307e\u305f\u306f\u5f62\u5f0f\u30a8\u30e9\u30fc<\/p>\n<\/li>\n<li>\n<p>req.body \u3092\u53d7\u3051\u53d6\u308b\u305f\u3081\u306e\u30df\u30c9\u30eb\u30a6\u30a7\u30a2\u672a\u4f7f\u7528<\/p>\n<\/li>\n<\/ul>\n<p>Express\u3067\u306e\u5bfe\u7b56\uff1a<\/p>\n<pre><code>app.<span>use<\/span>(express.json()); <span>\/\/ JSON\u30d1\u30fc\u30b9\u7528<\/span><\/code><\/pre>\n<p>\u3053\u308c\u304c\u306a\u3044\u3068\u3001req.body \u306f\u5e38\u306b undefined \u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<hr>\n<h2>\u3082\u3046Ajax\u901a\u4fe1\u3067\u8ff7\u308f\u306a\u3044\u305f\u3081\u306b<\/h2>\n<p>Ajax\u306f\u4e00\u898b\u30b7\u30f3\u30d7\u30eb\u306b\u898b\u3048\u3066\u3001\u5b9f\u306f<strong>\u30b5\u30fc\u30d0\u30fc\u3068\u306e\u9023\u643a\u30fbCORS\u8a2d\u5b9a\u30fb\u30c7\u30fc\u30bf\u5f62\u5f0f<\/strong>\u3068\u3044\u3063\u305f\u8907\u6570\u306e\u8981\u7d20\u304c\u7d61\u307f\u5408\u3063\u3066\u3044\u307e\u3059\u3002\u3060\u304b\u3089\u3053\u305d\u3001\u3046\u307e\u304f\u3044\u304b\u306a\u3044\u6642\u306b\u306f\u51b7\u9759\u306b\u4e00\u3064\u4e00\u3064\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n<h3>\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8\u3067\u5fa9\u7fd2\u3057\u3088\u3046\uff01<\/h3>\n<ul>\n<li>\n<p>fetch \u306e\u66f8\u304d\u65b9\u306f\u6b63\u3057\u3044\u304b\uff1f<\/p>\n<\/li>\n<li>\n<p>header\u306b Content-Type \u3092\u5165\u308c\u3066\u3044\u308b\u304b\uff1f<\/p>\n<\/li>\n<li>\n<p>body\u306b\u6b63\u3057\u304fJSON\u3092\u6e21\u3057\u3066\u3044\u308b\u304b\uff1f<\/p>\n<\/li>\n<li>\n<p>\u30b5\u30fc\u30d0\u30fc\u5074\u3067 req.body \u3092\u6271\u3048\u308b\u72b6\u614b\u304b\uff1f<\/p>\n<\/li>\n<li>\n<p>CORS\u30dd\u30ea\u30b7\u30fc\u3067\u30d6\u30ed\u30c3\u30af\u3055\u308c\u3066\u3044\u306a\u3044\u304b\uff1f<\/p>\n<\/li>\n<li>\n<p>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30bf\u30d6\u3067\u30ea\u30af\u30a8\u30b9\u30c8\u3068\u30ec\u30b9\u30dd\u30f3\u30b9\u3092\u78ba\u8a8d\u3057\u305f\u304b\uff1f<\/p>\n<\/li>\n<\/ul>\n<h3>\u3010\u5916\u90e8\u30ea\u30f3\u30af\u3011<\/h3>\n<p><a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/API\/fetch\">MDN Web Docs: fetch()<\/a><\/p>\n<p><a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/HTTP\/CORS\">MDN Web Docs: CORS\u3068\u306f<\/a><\/p>\n<p><a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/HTTP\/Headers\">MDN Web Docs: HTTP headers<\/a><\/p>\n<h3>\u3010\u5185\u90e8\u30ea\u30f3\u30af\u3011<\/h3>\n<p><a href=\"https:\/\/route-zero.com\/recruit\/route\/1109\/\">JavaScript\u3067\u3088\u304f\u767a\u751f\u3059\u308b\u30a8\u30e9\u30fc\u300cReferenceError\u300d\u300cSyntaxError\u300d\u306a\u3069\u306e\u539f\u56e0\u3068\u5bfe\u7b56\u3092\u5177\u4f53\u4f8b\u4ed8\u304d\u3067\u89e3\u8aac<\/a><\/p>\n<p><a href=\"https:\/\/route-zero.com\/recruit\/route\/917\/\">JavaScript\u306e\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u304c\u308f\u304b\u3089\u306a\u3044\uff1f\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u5b9f\u4f8b\u3067\u3084\u3055\u3057\u304f\u89e3\u8aac\uff01<\/a><\/p>\n<p><a href=\"https:\/\/route-zero.com\/recruit\/route\/965\/\">JavaScript\u306e\u914d\u5217\u30fbJSON\u30fbmap\u30fbMap\uff1a\u30c7\u30fc\u30bf\u64cd\u4f5c\u8853<\/a><\/p>\n<\/div>\n","protected":false},"featured_media":1129,"template":"","_links":{"self":[{"href":"https:\/\/route-zero.com\/recruit\/wp-json\/wp\/v2\/route\/1128"}],"collection":[{"href":"https:\/\/route-zero.com\/recruit\/wp-json\/wp\/v2\/route"}],"about":[{"href":"https:\/\/route-zero.com\/recruit\/wp-json\/wp\/v2\/types\/route"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/route-zero.com\/recruit\/wp-json\/wp\/v2\/media\/1129"}],"wp:attachment":[{"href":"https:\/\/route-zero.com\/recruit\/wp-json\/wp\/v2\/media?parent=1128"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}