{"id":4493,"date":"2023-09-10T08:26:02","date_gmt":"2023-09-09T23:26:02","guid":{"rendered":"http:\/\/attacktube.com\/?p=4493"},"modified":"2023-09-10T15:39:14","modified_gmt":"2023-09-10T06:39:14","slug":"%e3%80%90javascript%e3%80%91%e7%94%bb%e5%83%8f%e3%82%92blob%e3%82%aa%e3%83%96%e3%82%b8%e3%82%a7%e3%82%af%e3%83%88%e3%81%ab%e5%a4%89%e6%8f%9b%e5%be%8c%e3%81%abblob-url%e3%82%92%e7%94%9f%e6%88%90","status":"publish","type":"post","link":"https:\/\/attacktube.com\/?p=4493","title":{"rendered":"\u3010JavaScript\u3011\u753b\u50cf\u3092Blob\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5909\u63db\u5f8c\u306bBlob URL\u3092\u751f\u6210\u3059\u308b\u3010\u4e2d\u7d1a\u8005\u3011"},"content":{"rendered":"\n<p>\u6b21\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001\u753b\u50cf\u3092Blob\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5909\u63db\u5f8c\u306bBlob URL\u3092\u751f\u6210\u3059\u308b\u3002<br><br>\u3053\u306e\u30b3\u30fc\u30c9\u306f\u6b21\u306e\u95a2\u6570\u7b49\u3092\u5b66\u7fd2\u3059\u308b\u305f\u3081\u306e\u30b3\u30fc\u30c9\u3067\u3042\u308b\u3002<br>fetch()\u95a2\u6570<br>new Blob()\u3067\u65b0\u3057\u3044Blob\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u751f\u6210<br>URL.createObjectURL()\u95a2\u6570<br>URL.revokeObjectURL()\u95a2\u6570<br>async\/await \u975e\u540c\u671f\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3092\u884c\u3046\u305f\u3081\u306e\u69cb\u6587<br>arrayBuffer\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092Blob\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5909\u63db\u3059\u308b\u3002<br>arrayBuffer()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066arrayBuffer\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u751f\u6210\u3059\u308b\u3002<\/p>\n\n\n\n<!--more-->\n\n\n\n<br>\n<script async=\"\" src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-3461056110605997\" crossorigin=\"anonymous\"><\/script>\n<ins class=\"adsbygoogle\" style=\"display:block; text-align:center;\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\" data-ad-client=\"ca-pub-3461056110605997\" data-ad-slot=\"3137443461\"><\/ins>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script>\n<br>\n\n\n\n<pre><code>\n&lt;!DOCTYPE html&gt;\n&lt;html lang=&quot;ja&quot;&gt;\n\n&lt;head&gt;\n\n  &lt;meta charset=&quot;utf-8&quot;&gt;\n  &lt;title&gt;sample&lt;\/title&gt;\n\n  &lt;style&gt;\n  &lt;\/style&gt;\n\n&lt;\/head&gt;\n\n&lt;body&gt;\n\n  \u753b\u50cf\u3092 Blob \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5909\u63db\u5f8c\u306bBlob URL\u3092\u751f\u6210\u3059\u308b\u3002&lt;br&gt;\n  &lt;br&gt;\n\n  &lt;button id=&quot;button&quot;&gt;\u30dc\u30bf\u30f3&lt;\/button&gt;\n\n  &lt;br&gt;\n\n  &lt;div id=&quot;test&quot;&gt;\n  &lt;\/div&gt;\n\n  &lt;script&gt;\n\n    \/\/ \u753b\u50cf\u3092 Blob \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5909\u63db\u5f8c\u306bBlob URL\u3092\u751f\u6210\u3059\u308b\u3002\n    const loadImg = (function() {\n\n      \/\/ \u753b\u50cf\u306eURL\n      const imageUrl = &#039;http:\/\/localhost\/test13\/001.jpg&#039;;\n\n      \/\/ \u65b0\u3057\u3044Image\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\n      const imgElement = new Image();\n\n      const Button = document.getElementById(&#039;button&#039;);\n\n      async function getImage() {\n\n        \/\/ \u753b\u50cf\u3092\u53d6\u5f97\n        const response = await fetch(imageUrl);\n        const arrayBuffer = await response.arrayBuffer();\n        const testElement = document.getElementById(&#039;test&#039;);\n\n        console.log(&#039;arrayBuffer = &#039;, arrayBuffer);\/\/ ArrayBuffer { byteLength: 350191 }\n\n        \/\/ arrayBufferList\u3092Blob\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5909\u63db\u3059\u308b\u3002\n        \/\/ \u7b2c2\u5f15\u6570\u306f\u306a\u304f\u3066\u3082OK\n        \/\/ const reconstructedBlob = new Blob([arrayBuffer], { type: &quot;image\/jpeg&quot; });\n        const reconstructedBlob = new Blob([arrayBuffer]);\n\n        console.log(&#039;imgElement.src = &#039;, imgElement.src);\n\n        if (imgElement.src) {\n          URL.revokeObjectURL(imgElement.src);\n          console.warn(&#039;URL.revokeObjectURL(imgElement.src)\u3092\u5b9f\u884c\u3057\u305f\u3002&#039;);\n        } else {\n          console.log(&#039;else imgElement.src = &#039;, imgElement.src);\n        }\n\n        imgElement.src = URL.createObjectURL(reconstructedBlob);\n\n        \/\/ \u4ee5\u524d\u306e\u753b\u50cf\u3092\u30af\u30ea\u30a2\n        if (testElement) {\n          testElement.innerHTML = &#039;&#039;; \/\/ \u3059\u3079\u3066\u306e\u5b50\u8981\u7d20\u3092\u30af\u30ea\u30a2\n        }\n\n        console.log(&#039;imgElement.src = &#039;, imgElement.src);\n\n        testElement.appendChild(imgElement);\n\n      }\n\n      \/\/ \u5b9f\u884c\u3059\u308b\u3002\n      Button.addEventListener(&#039;click&#039;, () =&gt; getImage());\n\n    })();\n\n  &lt;\/script&gt;\n\n&lt;\/body&gt;\n\n&lt;\/html&gt;\n<\/code><\/pre>\n\n\n\n<script type=\"text\/javascript\">\njQuery(function($){\n$(\".jp-video\").hide();\n});\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>\u6b21\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001\u753b\u50cf\u3092Blob\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5909\u63db\u5f8c\u306bBlob URL\u3092\u751f\u6210\u3059\u308b\u3002 \u3053\u306e\u30b3\u30fc\u30c9\u306f\u6b21\u306e\u95a2\u6570\u7b49\u3092\u5b66\u7fd2\u3059\u308b\u305f\u3081\u306e\u30b3\u30fc\u30c9\u3067\u3042\u308b\u3002fetch()\u95a2\u6570new Blob()\u3067\u65b0\u3057\u3044Blob\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u751f\u6210URL.crea [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[3],"tags":[],"class_list":["post-4493","post","type-post","status-publish","format-standard","hentry","category-javascript"],"jetpack_featured_media_url":"","jetpack-related-posts":[],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/attacktube.com\/index.php?rest_route=\/wp\/v2\/posts\/4493","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/attacktube.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/attacktube.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/attacktube.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/attacktube.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4493"}],"version-history":[{"count":4,"href":"https:\/\/attacktube.com\/index.php?rest_route=\/wp\/v2\/posts\/4493\/revisions"}],"predecessor-version":[{"id":4511,"href":"https:\/\/attacktube.com\/index.php?rest_route=\/wp\/v2\/posts\/4493\/revisions\/4511"}],"wp:attachment":[{"href":"https:\/\/attacktube.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4493"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/attacktube.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4493"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/attacktube.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4493"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}