{"id":7500,"date":"2023-04-13T11:24:48","date_gmt":"2023-04-13T02:24:48","guid":{"rendered":"https:\/\/kininariantenna.com\/?p=7500"},"modified":"2023-04-13T12:17:00","modified_gmt":"2023-04-13T03:17:00","slug":"javascript-promise%e3%81%ae%e6%a7%8b%e6%96%87%e3%81%a8%e4%bd%bf%e3%81%84%e6%96%b9%ef%bc%81","status":"publish","type":"post","link":"https:\/\/kininariantenna.com\/?p=7500","title":{"rendered":"JavaScript Promise\u306e\u69cb\u6587\u3068\u4f7f\u3044\u65b9\uff01"},"content":{"rendered":"<p>JavaScript Promise\u306e\u69cb\u6587\u3068\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u77e5\u308a\u305f\u3044\u3068\u304d\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p>\u3051\u3069\u3001\u305d\u3093\u306a\u4e2d\u3067\u60a9\u3080\u3053\u3068\u306f\u3001<\/p>\n<div class=\"kininarukoto1\">\u30fbJavaScript Promise\u306e\u69cb\u6587\u3068\u4f7f\u3044\u65b9\u304c\u308f\u304b\u3089\u306a\u3044<\/div>\n<p>\u3067\u3059\u3088\u306d\u3002<\/p>\n<p>\u4eca\u56de\u306f\u305d\u3093\u306a\u304a\u60a9\u307f\u3092\u89e3\u6c7a\u3059\u308b<\/p>\n<div class=\"rdinfo\">\u30fbJavaScript Promise\u306e\u69cb\u6587\u3068\u4f7f\u3044\u65b9<\/div>\n<p>\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u307e\u3059\uff01<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_46 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">\u3082\u304f\u3058<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/kininariantenna.com\/?p=7500\/#JavaScript_Promise%E3%81%A8%E3%81%AF%E3%81%AA%E3%81%AB%EF%BC%9F\" title=\"JavaScript Promise\u3068\u306f\u306a\u306b\uff1f\">JavaScript Promise\u3068\u306f\u306a\u306b\uff1f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/kininariantenna.com\/?p=7500\/#JavaScript_Promise%E3%81%AE%E6%A7%8B%E6%96%87\" title=\"JavaScript Promise\u306e\u69cb\u6587\">JavaScript Promise\u306e\u69cb\u6587<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/kininariantenna.com\/?p=7500\/#%E7%B5%84%E3%81%BF%E5%90%88%E3%82%8F%E3%81%9B%E4%BE%8B\" title=\"\u7d44\u307f\u5408\u308f\u305b\u4f8b\">\u7d44\u307f\u5408\u308f\u305b\u4f8b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/kininariantenna.com\/?p=7500\/#%E5%85%B7%E4%BD%93%E7%9A%84%E3%81%AA%E5%87%A6%E7%90%86%E3%82%92%E5%90%AB%E3%82%80%E3%82%B5%E3%83%B3%E3%83%97%E3%83%AB%E3%82%B3%E3%83%BC%E3%83%89\" title=\"\u5177\u4f53\u7684\u306a\u51e6\u7406\u3092\u542b\u3080\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\">\u5177\u4f53\u7684\u306a\u51e6\u7406\u3092\u542b\u3080\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/kininariantenna.com\/?p=7500\/#%E3%81%95%E3%81%84%E3%81%94%E3%81%AB\" title=\"\u3055\u3044\u3054\u306b\">\u3055\u3044\u3054\u306b<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"JavaScript_Promise%E3%81%A8%E3%81%AF%E3%81%AA%E3%81%AB%EF%BC%9F\"><\/span>JavaScript Promise\u3068\u306f\u306a\u306b\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>JavaScript Promise\u306f\u3001\u975e\u540c\u671f\u51e6\u7406\u306e\u7d50\u679c\u3092\u8868\u73fe\u3059\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3002<\/p>\n<p>Promise\u306f\u3001\u51e6\u7406\u304c\u5b8c\u4e86\u3057\u305f\u5834\u5408\u306b\u6210\u529f\uff08\u6210\u529f\u6642\u306e\u5024\u3092\u8fd4\u3059\uff09\u307e\u305f\u306f\u5931\u6557\uff08\u30a8\u30e9\u30fc\u3092\u8fd4\u3059\uff09\u3092\u30ad\u30e3\u30c3\u30c1\u30a2\u30c3\u30d7\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>Promise\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b\u3088\u308a\u3082\u8907\u96d1\u306a\u975e\u540c\u671f\u51e6\u7406\u3092\u7ba1\u7406\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><!--\u5439\u304d\u51fa\u3057\u306f\u3058\u307e\u308a--><\/p>\n<div class=\"fukidashi1\">\n<div class=\"icon\">\n<div class=\"wphg\"><img loading=\"lazy\" src=\"\/wp-content\/uploads\/2021\/07\/taka_kao3.gif\" alt=\"\u30bf\u30ab\u30d2\u30ed\" width=\"110\" height=\"110\" \/><\/div>\n<div class=\"iconfont\">\u30bf\u30ab\u30d2\u30ed<\/div>\n<\/div>\n<div class=\"bubble\">Promise\u3092\u5165\u308c\u306a\u3044\u3068\u4f8b\u3048\u3070\u3001\u8aad\u307f\u8fbc\u307f\u51e6\u7406\u304c\u7d42\u308f\u3089\u306a\u3044\u72b6\u614b\u3067\u30da\u30fc\u30b8\u9077\u79fb\u3055\u305b\u3066\u3057\u307e\u3044\u3001\u30da\u30fc\u30b8\u306e\u30c7\u30fc\u30bf\u304c\u7a7a\u3063\u307d\u3068\u3044\u3046\u3053\u3068\u306b\u306a\u308b\u306e\u3067\u3001\u975e\u540c\u671f\u51e6\u7406\u3067\u8907\u5408\u7684\u306b\u51e6\u7406\u3092\u884c\u3063\u3066\u3044\u308b\u5834\u5408\u306f\u304b\u306a\u3089\u305a\u3044\u308c\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/div>\n<\/div>\n<p><!--\u5439\u304d\u51fa\u3057\u7d42\u308f\u308a--><\/p>\n<h2><span class=\"ez-toc-section\" id=\"JavaScript_Promise%E3%81%AE%E6%A7%8B%E6%96%87\"><\/span>JavaScript Promise\u306e\u69cb\u6587<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Promise\u306e\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<div class=\"info\">new Promise(function(resolve, reject) {<br \/>\n\/\/ \u975e\u540c\u671f\u51e6\u7406\u306e\u5b9f\u884c<br \/>\n\/\/ \u6210\u529f\u6642\u306f resolve() \u3092\u547c\u3076<br \/>\n\/\/ \u5931\u6557\u6642\u306f reject() \u3092\u547c\u3076<br \/>\n});<\/div>\n<h3><span class=\"ez-toc-section\" id=\"%E7%B5%84%E3%81%BF%E5%90%88%E3%82%8F%E3%81%9B%E4%BE%8B\"><\/span>\u7d44\u307f\u5408\u308f\u305b\u4f8b<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u4f8b\u3048\u3070\u3001\u6b21\u306e\u3088\u3046\u306a\u975e\u540c\u671f\u51e6\u7406\u3092 Promise\u3067\u8868\u73fe\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001fetch() \u30e1\u30bd\u30c3\u30c9\u3067\u975e\u540c\u671f\u51e6\u7406\u3092\u5b9f\u884c\u3057\u3001\u305d\u306e\u7d50\u679c\u3092 Promise \u3067\u8868\u73fe\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u6210\u529f\u6642\u306b\u306f resolve() \u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3001\u53d6\u5f97\u3057\u305f\u30c7\u30fc\u30bf\u3092\u8fd4\u3057\u307e\u3059\u3002\u5931\u6557\u6642\u306b\u306f reject() \u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3001\u30a8\u30e9\u30fc\u3092\u8fd4\u3057\u307e\u3059\u3002<br \/>\nPromise\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u3001\u51e6\u7406\u306e\u5b8c\u4e86\u3092\u5f85\u3064\u305f\u3081\u306b\u3001then() \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u6210\u529f\u6642\u3068\u5931\u6557\u6642\u306e\u51e6\u7406\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-javascript line-numbers\">function fetchData() {\r\n  return new Promise(function(resolve, reject) {\r\n    \/\/ \u975e\u540c\u671f\u51e6\u7406\u306e\u5b9f\u884c\r\n    fetch('https:\/\/example.com\/data')\r\n      .then(function(response) {\r\n        if (response.status === 200) {\r\n          return response.json();\r\n        } else {\r\n          throw new Error('\u30c7\u30fc\u30bf\u306e\u53d6\u5f97\u306b\u5931\u6557\u3057\u307e\u3057\u305f\u3002');\r\n        }\r\n      })\r\n      .then(function(data) {\r\n        resolve(data);\r\n      })\r\n      .catch(function(error) {\r\n        reject(error);\r\n      });\r\n  });\r\n}<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"%E5%85%B7%E4%BD%93%E7%9A%84%E3%81%AA%E5%87%A6%E7%90%86%E3%82%92%E5%90%AB%E3%82%80%E3%82%B5%E3%83%B3%E3%83%97%E3%83%AB%E3%82%B3%E3%83%BC%E3%83%89\"><\/span>\u5177\u4f53\u7684\u306a\u51e6\u7406\u3092\u542b\u3080\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Promise\u3092\u4f7f\u3063\u305f\u5177\u4f53\u7684\u306a\u51e6\u7406\u3092\u542b\u3080\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3059\u3002\u3053\u306e\u4f8b\u3067\u306f\u3001\u975e\u540c\u671f\u3067\u753b\u50cf\u3092\u8aad\u307f\u8fbc\u3093\u3067\u3001\u8aad\u307f\u8fbc\u307f\u304c\u5b8c\u4e86\u3057\u305f\u3089\u753b\u50cf\u3092\u8868\u793a\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-javascript line-numbers\">function loadImage(url) {\r\n  return new Promise(function(resolve, reject) {\r\n    var image = new Image();\r\n    image.onload = function() {\r\n      resolve(image);\r\n    };\r\n    image.onerror = function() {\r\n      reject('\u753b\u50cf\u306e\u8aad\u307f\u8fbc\u307f\u306b\u5931\u6557\u3057\u307e\u3057\u305f\u3002');\r\n    };\r\n    image.src = url;\r\n  });\r\n}\r\n\r\nloadImage('https:\/\/kininariantenna.com\/wp-content\/uploads\/2022\/11\/kini-js.png')\r\n .then(function(image) {\r\n\t\tconsole.log(image.src);\r\n  })\r\n  .catch(function(error) {\r\n\t\tconsole.log(error);\r\n  });<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\u3001loadImage() \u95a2\u6570\u3067Promise\u3092\u4f5c\u6210\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u306ePromise\u306f\u3001\u3053\u306e\u30da\u30fc\u30b8\u3067\u4f7f\u308f\u308c\u3066\u3044\u308b\u753b\u50cf\uff08&#8217;https:\/\/kininariantenna.com\/wp-content\/uploads\/2022\/11\/kini-js.png&#8217;\uff09\u306e\u8aad\u307f\u8fbc\u307f\u304c\u5b8c\u4e86\u3057\u305f\u3089 resolve() \u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3066\u3001\u753b\u50cf\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8fd4\u3057\u3001<br \/>\n\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306b\u306f\u3001reject() \u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3066\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u8fd4\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>loadImage() \u95a2\u6570\u3092\u547c\u3073\u51fa\u3059\u3068\u3001Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u8fd4\u3055\u308c\u3001then() \u30e1\u30bd\u30c3\u30c9\u3067\u753b\u50cf\u306e\u8868\u793a\u51e6\u7406\u3092\u7d99\u7d9a\u3055\u305b\u3066\u3044\u304d\u307e\u3059\u3002<br \/>\ncatch()\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u30a8\u30e9\u30fc\u51e6\u7406\u3092\u5b9a\u7fa9\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u753b\u50cf\u3092\u8aad\u307f\u8fbc\u3080\u305f\u3081Image \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u7528\u3057\u3001<br \/>\n\u753b\u50cf\u306e\u8aad\u307f\u8fbc\u307f\u304c\u5b8c\u4e86\u3057\u305f\u3068\u304d\u306bonload\u30a4\u30d9\u30f3\u30c8\u3001<br \/>\n\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306b\u306fonerror\u30a4\u30d9\u30f3\u30c8\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n<p>\u305d\u3057\u3066\u305d\u308c\u305e\u308c\u306e\u30a4\u30d9\u30f3\u30c8\u306b\u5bfe\u3057\u3066\u3001resolve()\u30e1\u30bd\u30c3\u30c9\u307e\u305f\u306f reject()\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u3067\u3001<br \/>\nPromise\u306e\u72b6\u614b\u3092\u5909\u66f4\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u7d50\u679c\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<p>\u6b63\u5e38\u306e\u5834\u5408<\/p>\n<div class=\"info\">&#8216;https:\/\/kininariantenna.com\/wp-content\/uploads\/2022\/11\/kini-js.png&#8217;<\/div>\n<p>\u7570\u5e38\uff08\u753b\u50cf\u304c\u898b\u3064\u304b\u3089\u306a\u3044\uff09\u5834\u5408<\/p>\n<div class=\"info\">&#8216;\u753b\u50cf\u306e\u8aad\u307f\u8fbc\u307f\u306b\u5931\u6557\u3057\u307e\u3057\u305f\u3002&#8217;<\/div>\n<h2><span class=\"ez-toc-section\" id=\"%E3%81%95%E3%81%84%E3%81%94%E3%81%AB\"><\/span>\u3055\u3044\u3054\u306b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u4eca\u56de\u306f\u3001<\/p>\n<div class=\"endinfo\">\u30fbJavaScript Promise\u306e\u69cb\u6587\u3068\u4f7f\u3044\u65b9<\/div>\n<p>\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/p>\n<p>\u307e\u305f\u3001\u4ed6\u306b\u3082\u5f79\u306b\u7acb\u3064\u60c5\u5831\u304c\u3042\u308a\u307e\u3059\u306e\u3067\u3001\u3088\u308d\u3057\u3051\u308c\u3070\u3054\u53c2\u7167\u9802\u3051\u308c\u3070\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript Promise\u306e\u69cb\u6587\u3068\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u77e5\u308a\u305f\u3044\u3068\u304d\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002 \u3051\u3069\u3001\u305d\u3093\u306a\u4e2d\u3067\u60a9\u3080\u3053\u3068\u306f\u3001 \u30fbJavaScript Promise\u306e\u69cb\u6587\u3068\u4f7f\u3044\u65b9\u304c\u308f\u304b\u3089\u306a\u3044 \u3067\u3059\u3088\u306d\u3002 \u4eca\u56de\u306f\u305d\u3093\u306a\u304a\u60a9\u307f\u3092\u89e3&#8230;<\/p>\n","protected":false},"author":1,"featured_media":7389,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[168],"tags":[182],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.4.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>JavaScript Promise\u306e\u69cb\u6587\u3068\u4f7f\u3044\u65b9\uff01 - \u30ad\u30cb\u30ca\u30ea\u30a2\u30f3\u30c6\u30ca<\/title>\n<meta name=\"description\" content=\"JavaScript Promise\u306e\u69cb\u6587\u3068\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u307e\u3059\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/kininariantenna.com\/?p=7500\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta 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