{"id":126245,"date":"2024-03-24T21:46:33","date_gmt":"2024-03-24T12:46:33","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/javascript%e3%81%a7%e7%94%bb%e5%83%8f%e3%82%92%e3%83%80%e3%82%a6%e3%83%b3%e3%83%ad%e3%83%bc%e3%83%89%e3%81%99%e3%82%8b\/"},"modified":"2024-04-04T22:04:31","modified_gmt":"2024-04-04T13:04:31","slug":"javascript%e3%81%a7%e7%94%bb%e5%83%8f%e3%82%92%e3%83%80%e3%82%a6%e3%83%b3%e3%83%ad%e3%83%bc%e3%83%89%e3%81%99%e3%82%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/javascript%e3%81%a7%e7%94%bb%e5%83%8f%e3%82%92%e3%83%80%e3%82%a6%e3%83%b3%e3%83%ad%e3%83%bc%e3%83%89%e3%81%99%e3%82%8b\/","title":{"rendered":"JavaScript\u3067\u753b\u50cf\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3059\u308b"},"content":{"rendered":"<p>JavaScript\u306efetch\u3068Blob\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u3063\u3066\u753b\u50cf\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3059\u308b\u65b9\u6cd5\u3067\u3059\u3002\u4f8b\u3092\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title function_\">downloadImage<\/span>(<span class=\"hljs-params\">url, filename<\/span>) {\r\n<span class=\"hljs-title function_\">fetch<\/span>(url)\r\n.<span class=\"hljs-title function_\">then<\/span>(<span class=\"hljs-function\"><span class=\"hljs-params\">response<\/span> =&gt;<\/span> response.<span class=\"hljs-title function_\">blob<\/span>())\r\n.<span class=\"hljs-title function_\">then<\/span>(<span class=\"hljs-function\"><span class=\"hljs-params\">blob<\/span> =&gt;<\/span> {\r\n<span class=\"hljs-comment\">\/\/ \u521b\u5efa\u4e00\u4e2aa\u6807\u7b7e<\/span>\r\n<span class=\"hljs-keyword\">const<\/span> a = <span class=\"hljs-variable language_\">document<\/span>.<span class=\"hljs-title function_\">createElement<\/span>(<span class=\"hljs-string\">'a'<\/span>);\r\na.<span class=\"hljs-property\">href<\/span> = <span class=\"hljs-variable language_\">window<\/span>.<span class=\"hljs-property\">URL<\/span>.<span class=\"hljs-title function_\">createObjectURL<\/span>(blob);\r\na.<span class=\"hljs-property\">download<\/span> = filename;\r\n<span class=\"hljs-comment\">\/\/ \u6a21\u62df\u70b9\u51fb\u4e0b\u8f7d<\/span>\r\na.<span class=\"hljs-title function_\">click<\/span>();\r\n<span class=\"hljs-comment\">\/\/ \u6e05\u9664URL\u5bf9\u8c61<\/span>\r\n<span class=\"hljs-variable language_\">window<\/span>.<span class=\"hljs-property\">URL<\/span>.<span class=\"hljs-title function_\">revokeObjectURL<\/span>(a.<span class=\"hljs-property\">href<\/span>);\r\n});\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u8c03\u7528downloadImage\u51fd\u6570<\/span>\r\n<span class=\"hljs-title function_\">downloadImage<\/span>(<span class=\"hljs-string\">'https:\/\/example.com\/image.jpg'<\/span>, <span class=\"hljs-string\">'image.jpg'<\/span>);\r\n<\/code><\/pre>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u306f\u3001`downloadImage` \u95a2\u6570\u306f 2 \u3064\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u53d7\u3051\u53d6\u308a\u307e\u3059\u3002\u753b\u50cf\u306e URL \u3068\u3001\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u5f8c\u306e\u30d5\u30a1\u30a4\u30eb\u540d\u3067\u3059\u3002`fetch` \u3092\u4f7f\u7528\u3057\u3066\u753b\u50cf\u306e\u30ec\u30b9\u30dd\u30f3\u30b9\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002`blob` \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u30ec\u30b9\u30dd\u30f3\u30b9\u3092 `Blob` \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5909\u63db\u3057\u307e\u3059\u3002\u7d9a\u3044\u3066\u3001`createObjectURL` \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066 `Blob` \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092 URL \u306b\u5909\u63db\u3057\u3001\u305d\u306e URL \u3092 `a` \u30bf\u30b0\u306e `href` \u5c5e\u6027\u306b\u5272\u308a\u5f53\u3066\u307e\u3059\u3002\u540c\u6642\u306b\u3001\u30d6\u30e9\u30a6\u30b6\u306b\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9 \u30c0\u30a4\u30a2\u30ed\u30b0\u3092\u8868\u793a\u3059\u308b\u305f\u3081\u306b\u3001`download` \u5c5e\u6027\u306b\u30d5\u30a1\u30a4\u30eb\u540d\u3092\u5272\u308a\u5f53\u3066\u307e\u3059\u3002\u6700\u5f8c\u306b\u3001`a` \u30bf\u30b0\u306e\u30af\u30ea\u30c3\u30af\u3092\u30b7\u30df\u30e5\u30ec\u30fc\u30c8\u3057\u3066\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9 \u30a2\u30af\u30b7\u30e7\u30f3\u3092\u30c8\u30ea\u30ac\u30fc\u3057\u3001`revokeObjectURL` \u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3066 URL \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30e1\u30e2\u30ea\u3092\u89e3\u653e\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript\u306efetch\u3068Blob\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u3063\u3066\u753b\u50cf\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3059\u308b\u65b9\u6cd5\u3067\u3059\u3002\u4f8b\u3092\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059\u3002 function downloadImage(url, filename) { fetch(url) . [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-126245","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>JavaScript\u3067\u753b\u50cf\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3059\u308b - 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\/ja\/blog\/javascript\u3067\u753b\u50cf\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3059\u308b\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"JavaScript\u3067\u753b\u50cf\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3059\u308b\" \/>\n<meta property=\"og:description\" content=\"JavaScript\u306efetch\u3068Blob\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u3063\u3066\u753b\u50cf\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3059\u308b\u65b9\u6cd5\u3067\u3059\u3002\u4f8b\u3092\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059\u3002 function downloadImage(url, filename) { fetch(url) . 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