{"id":5361,"date":"2024-03-16T21:26:45","date_gmt":"2024-03-16T12:26:45","guid":{"rendered":"https:\/\/attacktube.com\/?p=5361"},"modified":"2025-01-03T21:00:44","modified_gmt":"2025-01-03T12:00:44","slug":"%e3%80%90javascript%e3%80%91%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%81%ae%e5%ad%98%e5%9c%a8%e3%83%81%e3%82%a7%e3%83%83%e3%82%af%e3%83%8d%e3%82%a4%e3%83%86%e3%82%a3%e3%83%96%e6%a9%9f%e8%83%bd","status":"publish","type":"post","link":"https:\/\/attacktube.com\/?p=5361","title":{"rendered":"\u3010JavaScript\u3011\u30d5\u30a1\u30a4\u30eb\u306e\u5b58\u5728\u30c1\u30a7\u30c3\u30af(\u30cd\u30a4\u30c6\u30a3\u30d6\u6a5f\u80fd)\u30102024\u5e74\u6700\u65b0\u7248\u3011"},"content":{"rendered":"\n<p>\u3053\u306e\u30d5\u30a1\u30a4\u30eb\u306e\u5b58\u5728\u30c1\u30a7\u30c3\u30af\u306e\u6700\u65b0\u306f\u3053\u3061\u3089<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-wp-embed is-provider-attacktube wp-block-embed-attacktube\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"wp-embedded-content\" data-secret=\"NyjrgOsFEp\"><a href=\"https:\/\/attacktube.com\/?p=5793\">\u3010JavaScript\u3011\u30d5\u30a1\u30a4\u30eb\u306e\u5b58\u5728\u30c1\u30a7\u30c3\u30af(\u30cd\u30a4\u30c6\u30a3\u30d6\u6a5f\u80fd)\u30102025\u5e74\u6700\u65b0\u7248\u3011<\/a><\/blockquote><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"&#8220;\u3010JavaScript\u3011\u30d5\u30a1\u30a4\u30eb\u306e\u5b58\u5728\u30c1\u30a7\u30c3\u30af(\u30cd\u30a4\u30c6\u30a3\u30d6\u6a5f\u80fd)\u30102025\u5e74\u6700\u65b0\u7248\u3011&#8221; &#8212; AttackTube\" src=\"https:\/\/attacktube.com\/?p=5793&#038;embed=true#?secret=1or9NpZhnz#?secret=NyjrgOsFEp\" data-secret=\"NyjrgOsFEp\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe>\n<\/div><\/figure>\n\n\n\n<p>2024\u5e74\u73fe\u5728\u3001JavaScript\u306b\u304a\u3051\u308b\u30d5\u30a1\u30a4\u30eb\u306e\u5b58\u5728\u30c1\u30a7\u30c3\u30af\u65b9\u6cd5\u306f\u6b21\u306e\u901a\u308a\u3002<br>fetch\u30e1\u30bd\u30c3\u30c9\u3068async\/await\u3092\u4f7f\u3046\u3068\u30d5\u30a1\u30a4\u30eb\u306e\u5b58\u5728\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3046\u30b3\u30fc\u30c9\u3092\u66f8\u3051\u308b\u3002<br>fetch\u30e1\u30bd\u30c3\u30c9: ES2015(ES6)\u3067\u5c0e\u5165<br>async\/await: ES2017(ES8)\u3067\u5c0e\u5165<br><br>\u3053\u306e\u30b3\u30fc\u30c9\u306f\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u7528\u305b\u305a\u3001\u7d14\u7c8b\u306aJavaScript\u3092\u4f7f\u7528\u3057\u3066\u3001\u6307\u5b9a\u3055\u308c\u305f\u30d5\u30a1\u30a4\u30eb\u306e\u5b58\u5728\u3092\u78ba\u8a8d\u3059\u308b\u3002<br>\u30cd\u30a4\u30c6\u30a3\u30d6\u306aJavaScript\u306e\u6a5f\u80fd(fetch\u95a2\u6570\u3068async\/await)\u3092\u5229\u7528\u3057\u3066\u3001\u6307\u5b9a\u3055\u308c\u305f\u30d5\u30a1\u30a4\u30eb\u306e\u5b58\u5728\u3092\u78ba\u8a8d\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<p><a href=\"https:\/\/attacktube.com\/?p=177\">\u3010JavaScript\u3011\u30d5\u30a1\u30a4\u30eb\u306e\u5b58\u5728\u30c1\u30a7\u30c3\u30af(\u30cd\u30a4\u30c6\u30a3\u30d6\u6a5f\u80fd)\u30102023\u5e74\u6700\u65b0\u7248\u3011 (attacktube.com)<\/a>\u304b\u3089\u5c11\u3057\u6539\u5584\u3059\u308b\u3002<br>fetch()\u95a2\u6570\u306f\u3001\u975e\u540c\u671f\u64cd\u4f5c\u3092\u884c\u3046\u305f\u3081\u306bPromise\u3092\u8fd4\u3059\u304b\u3089\u3001new Promise\u306f\u4e0d\u8981\u3060\u3063\u305f\u3002\u305d\u308c\u304b\u3089\u3001try catch\u6587\u304cmain()\u95a2\u6570\u306e\u65b9\u3060\u3051\u3067\u3088\u304b\u3063\u305f\u3002<\/p>\n\n\n\n<pre><code>\nconst checkFileExistence = async function(url) {\n  const response = await fetch(url);\n  if (response.status === 200) {\n    console.log(&#039;\u30d5\u30a1\u30a4\u30eb\u306f\u5b58\u5728\u3057\u307e\u3059\u3002&#039;);\n    \/\/ \u30d5\u30a1\u30a4\u30eb\u304c\u5b58\u5728\u3059\u308b\u5834\u5408\u30010\u3092\u8fd4\u3059\n    return 0;\n  } else {\n    console.log(&#039;\u30d5\u30a1\u30a4\u30eb\u306f\u5b58\u5728\u3057\u307e\u305b\u3093\u3002&#039;);\n    \/\/ \u30d5\u30a1\u30a4\u30eb\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u30011\u3092\u8fd4\u3059\n    return 1;\n  }\n};\n\nconst imageUrl = &#039;http:\/\/localhost\/test13\/001.jpg&#039;;\n\nconst main = async function() {\n  try {\n    const ret = await checkFileExistence(imageUrl);\n    if (ret === 0) {\n      console.log(&#039;OK ret = &#039; + ret);\n    } else {\n      console.log(&#039;NG ret = &#039; + ret);\n    }\n  } catch (error) {\n    console.error(&#039;\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3057\u305f\u3002:&#039;, error);\n  }\n};\n\nmain();\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>\u3053\u306e\u30d5\u30a1\u30a4\u30eb\u306e\u5b58\u5728\u30c1\u30a7\u30c3\u30af\u306e\u6700\u65b0\u306f\u3053\u3061\u3089 2024\u5e74\u73fe\u5728\u3001JavaScript\u306b\u304a\u3051\u308b\u30d5\u30a1\u30a4\u30eb\u306e\u5b58\u5728\u30c1\u30a7\u30c3\u30af\u65b9\u6cd5\u306f\u6b21\u306e\u901a\u308a\u3002fetch\u30e1\u30bd\u30c3\u30c9\u3068async\/await\u3092\u4f7f\u3046\u3068\u30d5\u30a1\u30a4\u30eb\u306e\u5b58\u5728\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3046\u30b3\u30fc\u30c9\u3092\u66f8\u3051\u308b\u3002f [&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-5361","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\/5361","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=5361"}],"version-history":[{"count":8,"href":"https:\/\/attacktube.com\/index.php?rest_route=\/wp\/v2\/posts\/5361\/revisions"}],"predecessor-version":[{"id":5798,"href":"https:\/\/attacktube.com\/index.php?rest_route=\/wp\/v2\/posts\/5361\/revisions\/5798"}],"wp:attachment":[{"href":"https:\/\/attacktube.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5361"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/attacktube.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5361"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/attacktube.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5361"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}