{"id":88142,"date":"2019-03-17T20:16:22","date_gmt":"2019-03-17T11:16:22","guid":{"rendered":"https:\/\/www.sejuku.net\/blog\/?p=88142"},"modified":"2024-05-06T11:54:41","modified_gmt":"2024-05-06T02:54:41","slug":"javascript%e3%81%a7%e8%a1%a8%e7%a4%ba%e3%81%99%e3%82%8b%e6%96%87%e5%ad%97%e3%83%bb%e7%94%bb%e5%83%8f%e3%83%bb%e3%83%9d%e3%83%83%e3%83%97%e3%82%a2%e3%83%83%e3%83%97%e3%81%ae%e3%81%be%e3%81%a8%e3%82%81","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/88142","title":{"rendered":"JavaScript\u3067\u8868\u793a\u3059\u308b\u6587\u5b57\u30fb\u753b\u50cf\u30fb\u30dd\u30c3\u30d7\u30a2\u30c3\u30d7\u306e\u307e\u3068\u3081"},"content":{"rendered":"<p><div class=\"box_voice\"><b><br \/>\n\u305d\u3082\u305d\u3082JavaScript\u3067\u8868\u793a\u3067\u304d\u308b\u3082\u306e\u3063\u3066\u4f55\uff1f<br \/>\n\u6587\u5b57\u3084\u753b\u50cf\u306b\u30dd\u30c3\u30d7\u30a2\u30c3\u30d7\u306a\u3069\u3092\u8868\u793a\u3059\u308b\u65b9\u6cd5\u304c\u77e5\u308a\u305f\u3044<br \/>\n\u3055\u307e\u3056\u307e\u306a\u30e1\u30bd\u30c3\u30c9\u3092\u6d3b\u7528\u3057\u3066Web\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u8868\u793a\u3057\u305f\u3044<br \/>\n<\/b><\/div><\/p>\n<p>JavaScript\u3067Web\u958b\u767a\u3092\u3059\u308b\u306b\u3042\u305f\u308a\u3001\u753b\u9762\u306b<b>\u6587\u5b57\u3084\u753b\u50cf<\/b>\u3092\u8868\u793a\u3067\u304d\u308b\u3088\u3046\u306b\u52c9\u5f37\u3059\u308b\u3053\u3068\u3092\u907f\u3051\u3066\u306f\u901a\u308c\u307e\u305b\u3093\u3088\u306d\uff1f<\/p>\n<p>\u30ea\u30c3\u30c1\u306a\u30b3\u30f3\u30c6\u30f3\u30c4\u3092Web\u30b5\u30a4\u30c8\u306b\u76db\u308a\u8fbc\u3080\u3053\u3068\u306f\u3001\u4eca\u3084\u5e38\u8b58\u306b\u306a\u308a\u3064\u3064\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001\u3069\u3053\u304b\u3089\u52c9\u5f37\u3092\u59cb\u3081\u305f\u3089\u826f\u3044\u306e\u304b\u56f0\u3063\u3066\u3044\u308b\u65b9\u3082\u5c11\u306a\u304f\u306a\u3044\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n<p>\u3053\u3093\u306b\u3061\u306f\uff01\u30e9\u30a4\u30bf\u30fc\u306e\u30de\u30b5\u30c8\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u521d\u5fc3\u8005\u3067\u3082\u4eca\u65e5\u304b\u3089JavaScript\u3067\u591a\u5f69\u306a\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u8868\u793a\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u306e\u3067\u3001\u305c\u3072\u6700\u5f8c\u307e\u3067\u8aad\u3093\u3067\u7406\u89e3\u3092\u6df1\u3081\u3066\u9802\u3051\u308c\u3070\u5e78\u3044\u3067\u3059\u3002<\/p>\n<p><b>\u3053\u306e\u8a18\u4e8b\u306f\u3053\u3093\u306a\u4eba\u306e\u305f\u3081\u306b\u66f8\u304d\u307e\u3057\u305f<\/b><\/p>\n<div class=\"box01\">\n<ul>\n<li>JavaScript\u3067\u306e\u8868\u793a\u65b9\u6cd5\u3092\u5b66\u7fd2\u3057\u305f\u3044\u65b9<\/li>\n<li>\u6587\u5b57\u3084\u753b\u50cf\u306a\u3069\u591a\u5f69\u306a\u8868\u793a\u65b9\u6cd5\u3092\u77e5\u308a\u305f\u3044\u65b9<\/li>\n<li>\u3055\u307e\u3056\u307e\u306a\u30e1\u30bd\u30c3\u30c9\u306e\u6d3b\u7528\u65b9\u6cd5\u3092\u5b66\u3073\u305f\u3044\u65b9<\/li>\n<\/ul>\n<\/div>\n<h2>JavaScript\u3067\u8868\u793a\u3067\u304d\u308b\u3082\u306e<\/h2>\n<p> Web\u30b5\u30a4\u30c8\u3092\u69cb\u6210\u3059\u308b\u3082\u3063\u3068\u3082\u57fa\u672c\u7684\u306a\u8a00\u8a9e\u3068\u3057\u3066\u306f\u3001HTML \/ CSS \/ JavaScript\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u306a\u304b\u3067\u3082JavaScript\u306f\u3001\u305d\u308c\u81ea\u4f53\u3067<b>HTML\u3082CSS\u3082\u5236\u5fa1\u3067\u304d\u308b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e<\/b>\u306a\u306e\u3067\u6d3b\u7528\u6b21\u7b2c\u3067\u306fWeb\u30b5\u30a4\u30c8\u3092\u81ea\u7531\u81ea\u5728\u306b\u5236\u5fa1\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u6700\u8fd1\u306fJavaScript\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306a\u3069\u3082\u6d3b\u767a\u306b\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u3066\u304a\u308a\u3001\u6587\u5b57\u3084\u753b\u50cf\u3060\u3051\u3067\u306a\u304f\u30dd\u30c3\u30d7\u30a2\u30c3\u30d7\u306a\u3069\u306e\u30c0\u30a4\u30a2\u30ed\u30b0\u3082\u7c21\u5358\u306b\u8868\u793a\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u3064\u307e\u308a\u3001Web\u3067\u8868\u793a\u3067\u304d\u308b\u3082\u306e\u306fJavaScript\u3067\u3082\u8868\u793a\u30fb\u64cd\u4f5c\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3042\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>\u672c\u8a18\u4e8b\u3067\u306f\u3055\u307e\u3056\u307e\u306a\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u8868\u793a\u65b9\u6cd5\u306b\u3064\u3044\u3066\u5b66\u7fd2\u3057\u3066\u3044\u304d\u307e\u3059\u306e\u3067\u3001\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n<h2>\u6587\u5b57\u5217\u306e\u8868\u793a<\/h2>\n<p>\u3053\u306e\u7ae0\u3067\u306f\u3001\u57fa\u672c\u7684\u306a\u6587\u5b57\u5217\u3092\u3069\u306e\u3088\u3046\u306b\u8868\u793a\u3057\u305f\u3089\u826f\u3044\u306e\u304b\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n<p>\u4e3b\u306b\u3001document.write\u3001innerHTML\u30e1\u30bd\u30c3\u30c9\u3092\u6d3b\u7528\u3057\u305f\u8868\u793a\u30fb\u975e\u8868\u793a\u306e\u624b\u6cd5\u306b\u3064\u3044\u3066\u5b66\u3093\u3067\u3044\u304d\u307e\u3059\u3002<\/p>\n<h3>document.write\u3067\u6587\u5b57\u3092\u8868\u793a\u3059\u308b<\/h3>\n<p>document.write\u306fJavaScript\u3067<b>\u6587\u5b57\u3092\u8868\u793a\u3059\u308b<\/b>\u305f\u3081\u306e\u57fa\u672c\u7684\u306a\u30e1\u30bd\u30c3\u30c9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u5f15\u6570\u306b\u8868\u793a\u3057\u305f\u3044\u6587\u5b57\u5217\u3092\u6307\u5b9a\u3059\u308b\u3060\u3051\u306a\u306e\u3067\u3001\u6b21\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3059\u308c\u3070\u753b\u9762\u306b\u597d\u304d\u306a\u6587\u5b57\u3092\u8868\u793a\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\ndocument.write('\u3053\u3093\u306b\u3061\u306f\uff01');\r\n<\/pre>\n<p>\u5b9f\u884c\u3059\u308b\u3068\u753b\u9762\u306b\u300c\u3053\u3093\u306b\u3061\u306f\uff01\u300d\u3068\u3044\u3046\u6587\u5b57\u5217\u304c\u8868\u793a\u3055\u308c\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u6587\u5b57\u5217\u3060\u3051\u3067\u306a\u304fHTML\u30bf\u30b0\u3082\u8a8d\u8b58\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3001\u6b21\u306e\u3088\u3046\u306a\u8a18\u8ff0\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\ndocument.write('<h1>\u3053\u3093\u306b\u3061\u306f\uff01<\/h1>');\r\n<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001h1\u30bf\u30b0\u3092\u4ed8\u4e0e\u3057\u3066\u6587\u5b57\u5217\u3092\u6307\u5b9a\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u305d\u306e\u305f\u3081h1\u30bf\u30b0\u3092\u8a8d\u8b58\u3059\u308b\u306e\u3067\u3001\u5c11\u3057\u5927\u304d\u3081\u306e\u6587\u5b57\u5217\u304c\u8868\u793a\u3055\u308c\u308b\u3068\u3044\u3046\u308f\u3051\u3067\u3059\u3002<\/p>\n<h3>innerHTML\u3067\u6587\u5b57\u3092\u8868\u793a\u3059\u308b<\/h3>\n<p>\u6b21\u306b\u3001innerHTML\u3092\u4f7f\u3063\u305f\u6587\u5b57\u8868\u793a\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n<p>innerHTML\u306fJavaScript\u304b\u3089DOM\u8981\u7d20(HTML\u8981\u7d20)\u3092\u53d6\u5f97\u3057\u305f\u3042\u3068\u306b\u4f7f\u3048\u308b\u3088\u3046\u306b\u306a\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<\/p>\n<p>\u305d\u306e\u305f\u3081\u3001document.getElementById\u306a\u3069\u3092\u5229\u7528\u3057\u3066\u6700\u521d\u306bDOM\u8981\u7d20\u3092\u53d6\u5f97\u3057\u3066\u304b\u3089\u5229\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3068\u3044\u3046\u70b9\u306b\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:html decode:true\">\r\n&lt;body&gt;\r\n    <p id=\"text\"><\/p>\r\n\r\n\r\n    <script>      \r\n      const text = document.getElementById('text');\r\n      \r\n      text.innerHTML = '\u3053\u3093\u306b\u3061\u306f\uff01';\r\n    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class=\"lang:js decode:true\">\r\ntext.style.display = 'none';\r\n<\/pre>\n<p>text\u306f\u3042\u3089\u304b\u3058\u3081\u53d6\u5f97\u3057\u305fHTML\u8981\u7d20\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u305d\u306e\u305f\u3081\u3001\u4efb\u610f\u306eHTML\u8981\u7d20\u3092\u975e\u8868\u793a\u306b\u3059\u308b\u306b\u306f\u6b21\u306e\u3088\u3046\u306a\u8a18\u8ff0\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nconst text = document.getElementById('text');\r\n      \r\ntext.style.display = 'none';\r\n<\/pre>\n<p>\u30bf\u30a4\u30de\u30fc\u3092\u6d3b\u7528\u3059\u308c\u3070\u8a2d\u5b9a\u3057\u305f\u6642\u9593\u306b\u518d\u5ea6HTML\u8981\u7d20\u3092\u8868\u793a\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nsetTimeout(function() {\r\n    text.style.display = 'block';\r\n}, 2000)\r\n<\/pre>\n<p>\u3053\u308c\u306f2\u79d2\u5f8c\u306b\u975e\u8868\u793a\u306b\u3057\u3066\u3044\u305fHTML\u8981\u7d20\u3092\u8868\u793a\u3059\u308b\u4f8b\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u4ed5\u7d44\u307f\u3092\u6d3b\u7528\u3059\u308c\u3070\u3001\u8868\u793a\u30fb\u975e\u8868\u793a\u3092\u4ea4\u4e92\u306b\u7e70\u308a\u8fd4\u3059\u51e6\u7406\u3082\u7c21\u5358\u306b\u4f5c\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nconst text = document.getElementById('text');\r\nlet state = true;\r\n      \r\ntext.style.display = 'none';\r\n      \r\nsetInterval(function() {\r\n    if(state) {\r\n          text.style.display = 'block';\r\n    } else {\r\n          text.style.display = 'none';\r\n    }\r\n\r\n    state = !state;\r\n}, 1000)\r\n<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001setInterval\u3092\u5229\u7528\u3057\u30661\u79d2\u9593\u9694\u3067\u8868\u793a\u3068\u975e\u8868\u793a\u3092\u7e70\u308a\u8fd4\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u5909\u6570state\u306e\u4e2d\u8eab\u3092true \/ false\u3067\u5207\u308a\u66ff\u3048\u308b\u3053\u3068\u3067\u3001\u6761\u4ef6\u5206\u5c90\u3055\u305b\u3066\u3044\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n<h2>\u753b\u50cf\u306e\u8868\u793a<\/h2>\n<p>\u3053\u306e\u7ae0\u3067\u306f\u3001JavaScript\u3067\u753b\u50cf\u3092\u8868\u793a\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u4e3b\u306b\u3001\u57fa\u672c\u7684\u306a\u753b\u50cf\u306e\u8868\u793a\u65b9\u6cd5\u3068Image\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6d3b\u7528\u3057\u305f\u65b9\u6cd5\u306b\u3064\u3044\u3066\u5b66\u3093\u3067\u3044\u304d\u307e\u3059\u3002<\/p>\n<h3>\u57fa\u672c\u7684\u306a\u753b\u50cf\u306e\u8868\u793a\u65b9\u6cd5\u306b\u3064\u3044\u3066<\/h3>\n<p>javaScript\u3067\u753b\u50cf\u3092\u8868\u793a\u3059\u308b\u3082\u3063\u3068\u3082\u57fa\u672c\u7684\u306a\u65b9\u6cd5\u3068\u3057\u3066\u306f\u3001document.write\u306e\u5f15\u6570\u3078\u305d\u306e\u307e\u307eimg\u30bf\u30b0\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n<pre class=\"lang:html decode:true\">\r\ndocument.write('<img src=\u201d\/image\/sample.jpg\u201d>');\r\n<\/pre>\n<p>\u3053\u308c\u3067\u3001\u753b\u9762\u306b\u6307\u5b9a\u3057\u305f\u753b\u50cf\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u3082\u3061\u308d\u3093\u3001\u524d\u7ae0\u3068\u540c\u3058\u304finnerHTML\u3082\u5229\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nDOM\u8981\u7d20.innerHTML = '<img src=\u201d\/image\/sample.jpg\u201d>';\r\n<\/pre>\n<p>\u3053\u308c\u3089\u306e\u65b9\u6cd5\u306f\u624b\u8efd\u3067\u7c21\u5358\u306a\u306e\u3067\u3059\u304c\u3001\u5c11\u3057\u8907\u96d1\u306a\u3053\u3068\u3092\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u30d0\u30b0\u306e\u539f\u56e0\u3068\u306a\u308a\u304b\u306d\u307e\u305b\u3093\u3002<\/p>\n<p>\u305d\u3053\u3067\u3001\u6b21\u7ae0\u3067\u7d39\u4ecb\u3059\u308bImage\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5229\u7528\u3057\u305f\u65b9\u6cd5\u304c\u4e00\u822c\u7684\u306b\u306f\u5229\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>Image\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u3063\u305f\u8868\u793a\u65b9\u6cd5<\/h3>\n<p>JavaScript\u306f\u6a19\u6e96\u3067Image\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u63d0\u4f9b\u3057\u3066\u304a\u308a\u3001\u3053\u308c\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u3067\u3055\u307e\u3056\u307e\u306a\u753b\u50cf\u51e6\u7406\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>document.write\u3084innerHTML\u3060\u3068<b>img\u30bf\u30b0\u3092\u4f5c\u6210\u3059\u308b\u3060\u3051<\/b>\u306a\u306e\u3067\u3001JavaScript\u5074\u3067\u5236\u5fa1\u3057\u3065\u3089\u3044\u308f\u3051\u3067\u3059\u3002<br \/>\n\u3057\u304b\u3057\u3001Image\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5229\u7528\u3059\u308b\u3068\u753b\u50cf\u8981\u7d20\u3092JavaScript\u5074\u3067\u81ea\u7531\u306b\u5236\u5fa1\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044<\/p>\n<pre class=\"lang:js decode:true\">\r\nconst img = new Image();\r\n\r\nimg.src = \u2018\/image\/sample.jpg';\r\n\r\n\r\nconsole.log(img.width);\r\n\r\ndocument.body.appendChild(img);\r\n<\/pre>\n<p>Image\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3057\u305f\u3042\u3068\u306b\u3001\u753b\u50cf\u306e\u30d5\u30a1\u30a4\u30eb\u30d1\u30b9\u3092\u6307\u5b9a\u3057\u3066\u753b\u50cf\u30b5\u30a4\u30ba\u3092\u30b3\u30f3\u30bd\u30fc\u30eb\u30ed\u30b0\u306b\u51fa\u529b\u3059\u308b\u3053\u3068\u3082\u7c21\u5358\u306b\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u305f\u3060\u3057\u6ce8\u610f\u304c\u5fc5\u8981\u306a\u306e\u306f\u3001\u753b\u50cf\u30b5\u30a4\u30ba\u304c\u5927\u304d\u3044\u3068\u8aad\u307f\u8fbc\u307f\u51e6\u7406\u306b\u6642\u9593\u304c\u639b\u304b\u3063\u3066\u3057\u307e\u3044\u30b5\u30a4\u30ba\u304c\u53d6\u5f97\u3067\u304d\u306a\u3044\u30b1\u30fc\u30b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u305d\u3053\u3067\u3001onload\u3092\u4f7f\u3063\u3066\u753b\u50cf\u304c\u8aad\u307f\u8fbc\u307e\u308c\u305f\u3042\u3068\u306b\u753b\u50cf\u30b5\u30a4\u30ba\u3092\u53d6\u5f97\u3059\u308b\u3068\u3044\u3046\u51e6\u7406\u3092\u4f5c\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nconst img = new Image();\r\n\r\nimg.src = \u2018\/image\/sample.jpg';\r\nconsole.log(img.width);\r\n\r\n\r\nimg.onload = function() {\r\n \r\n    console.log(img.width);\r\n \r\n};\r\n\r\ndocument.body.appendChild(img);\r\n<\/pre>\n<p>\u3053\u306e\u3088\u3046\u306bImage\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u3046\u3068\u7d30\u304b\u3044\u5236\u5fa1\u304c\u53ef\u80fd\u306b\u306a\u308b\u306e\u3067\u30aa\u30b9\u30b9\u30e1\u3067\u3059\u3002<\/p>\n<h2>\u30dd\u30c3\u30d7\u30a2\u30c3\u30d7\u306e\u8868\u793a<\/h2>\n<p>\u3053\u306e\u7ae0\u3067\u306f\u3001JavaScript\u3067\u753b\u9762\u306b\u30dd\u30c3\u30d7\u30a2\u30c3\u30d7\u3092\u8868\u793a\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n<p>\u4e3b\u306b\u3001Alert\u306b\u3088\u308b\u30dd\u30c3\u30d7\u30a2\u30c3\u30d7\u3068\u81ea\u4f5c\u306e\u30c0\u30a4\u30a2\u30ed\u30b0\u3092\u8868\u793a\u3055\u305b\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u5b66\u3093\u3067\u3044\u304d\u307e\u3059\u3002<\/p>\n<h3>Alert\u3067\u30dd\u30c3\u30d7\u30a2\u30c3\u30d7\u3092\u8868\u793a\u3059\u308b<\/h3>\n<p>JavaScript\u306b\u3088\u308b\u30dd\u30c3\u30d7\u30a2\u30c3\u30d7\u3068\u8a00\u3048\u3070\u3001\u4ee3\u8868\u7684\u306a\u306e\u304calert\u306b\u3088\u308b\u3082\u306e\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u4efb\u610f\u306e\u6587\u5b57\u5217\u3092\u30dd\u30c3\u30d7\u30a2\u30c3\u30d7\u3059\u308b\u306b\u306f\u6b21\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nalert('\u3053\u3093\u306b\u3061\u306f');\r\n<\/pre>\n<p>\u5b9f\u884c\u3059\u308b\u3068\u6b21\u306e\u3088\u3046\u306a\u8868\u793a\u306b\u306a\u308a\u307e\u3059\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/03\/1.jpg\" alt=\"\" width=\"800\" height=\"400\" class=\"alignnone size-full wp-image-88147\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/03\/1.jpg 800w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/03\/1-150x75.jpg 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/03\/1-300x150.jpg 300w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/03\/1-640x320.jpg 640w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>\u5f15\u6570\u306b\u6307\u5b9a\u3057\u305f\u6587\u5b57\u5217\u3092\u81ea\u7531\u306b\u8868\u793a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n<p>\u6587\u5b57\u5217\u306e\u4e2d\u306b n \u3092\u633f\u5165\u3059\u308b\u3053\u3068\u3067\u6539\u884c\u3092\u4ed8\u3051\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nalert('\u3053\u3093\u306b\u3061\u306f\u3002n\u3053\u308c\u306f\u30b5\u30f3\u30d7\u30eb\u30e1\u30c3\u30bb\u30fc\u30b8\u3067\u3059');\r\n<\/pre>\n<p>\u5b9f\u884c\u3059\u308b\u3068\u6b21\u306e\u3088\u3046\u306a\u8868\u793a\u306b\u306a\u308a\u307e\u3059\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/03\/3.jpg\" alt=\"\" width=\"800\" height=\"400\" class=\"alignnone size-full wp-image-88146\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/03\/3.jpg 800w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/03\/3-150x75.jpg 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/03\/3-300x150.jpg 300w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/03\/3-640x320.jpg 640w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>\u307e\u305f\u3001\u6587\u5b57\u5217\u3060\u3051\u3067\u306a\u304f\u6570\u5024\u3092\u8868\u793a\u3057\u305f\u308a\u3001\u8a08\u7b97\u7d50\u679c\u3092\u51fa\u529b\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nalert(30 * 30);\r\n<\/pre>\n<p>\u5b9f\u884c\u3059\u308b\u3068\u6b21\u306e\u3088\u3046\u306a\u8868\u793a\u306b\u306a\u308a\u307e\u3059\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/03\/2.jpg\" alt=\"\" width=\"800\" height=\"400\" class=\"alignnone size-full wp-image-88144\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/03\/2.jpg 800w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/03\/2-150x75.jpg 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/03\/2-300x150.jpg 300w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/03\/2-640x320.jpg 640w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>\u3053\u306e\u3088\u3046\u306balert\u3092\u4f7f\u3046\u3068\u624b\u8efd\u306b\u30dd\u30c3\u30d7\u30a2\u30c3\u30d7\u3092\u8868\u793a\u3067\u304d\u308b\u306e\u3067\u4fbf\u5229\u3067\u3059\u3002<\/p>\n<p>\u3061\u306a\u307f\u306b\u3001alert\u306e\u57fa\u672c\u304b\u3089\u5fdc\u7528\u6280\u307e\u3067\u3092\u6b21\u306e\u8a18\u4e8b\u3067\u4f53\u7cfb\u7684\u306b\u307e\u3068\u3081\u3066\u3044\u308b\u306e\u3067\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/29821\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/08\/JS1-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010JavaScript\u5165\u9580\u3011alert(\u30a2\u30e9\u30fc\u30c8)\u30e1\u30c3\u30bb\u30fc\u30b8\u306f\u3053\u308c\u3067\u5b8c\u74a7\u3002\u4f7f\u3044\u65b9\u3092\u7dcf\u307e\u3068\u3081\uff01<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2025\u5e7412\u670829\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n<h3>\u81ea\u4f5c\u306e\u30c0\u30a4\u30a2\u30ed\u30b0\u3092\u8868\u793a\u3059\u308b<\/h3>\n<p>alert\u306a\u3069JavaScript\u304c\u6a19\u6e96\u3067\u63d0\u4f9b\u3057\u3066\u3044\u308b\u30dd\u30c3\u30d7\u30a2\u30c3\u30d7\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u958b\u767a\u8005\u304c<b>\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3092\u3067\u304d\u306a\u3044<\/b>\u3088\u3046\u306b\u8a2d\u8a08\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u305d\u3053\u3067\u3001\u30aa\u30ea\u30b8\u30ca\u30eb\u306e\u30c0\u30a4\u30a2\u30ed\u30b0\u3092\u8868\u793a\u3057\u305f\u3044\u5834\u5408\u306f\u81ea\u4f5c\u3092\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4f5c\u308a\u65b9\u3068\u3057\u3066\u306fHTML\u3068CSS\u3067\u30c0\u30a4\u30a2\u30ed\u30b0\u3092\u4f5c\u6210\u3057\u3066\u3001\u305d\u308c\u3092JavaScript\u3067\u5236\u5fa1\u3059\u308b\u3068\u3044\u3046\u65b9\u6cd5\u304c\u7c21\u5358\u3067\u3059\u3002<\/p>\n<p>\u306f\u3044\u30fb\u3044\u3044\u3048 \u306e\u30dc\u30bf\u30f3\u3092\u6301\u3063\u305f\u30c0\u30a4\u30a2\u30ed\u30b0\u306e\u9aa8\u7d44\u307f\u3092\u307e\u305a\u306fHTML\u3067\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:html decode:true\">\r\n<div id=\"dialog\">\r\n    <p>\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3057\u3066\u304f\u3060\u3055\u3044<\/p>\r\n    <button id=\"yes\">\u306f\u3044<\/button>\r\n    <button id=\"no\">\u3044\u3044\u3048<\/button>\r\n<\/div>\r\n<\/pre>\n<p>\u6b21\u306b\u3001CSS\u3067\u30c6\u30ad\u30b9\u30c8\u3084\u30dc\u30bf\u30f3\u306e\u914d\u7f6e\u3092\u8abf\u6574\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:css decode:true\">\r\n#dialog {\r\n    width: 250px;\r\n    margin: auto;\r\n    margin-top: 40vh;\r\n    padding: 30px 20px;\r\n    text-align: center;\r\n    border: 1px solid #aaa;\r\n    box-shadow: 2px 2px 4px #888;\r\n}\r\n<\/pre>\n<p>\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30c0\u30a4\u30a2\u30ed\u30b0\u304c\u8868\u793a\u3067\u304d\u307e\u3059\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/03\/4.jpg\" alt=\"\" width=\"800\" height=\"400\" class=\"alignnone size-full wp-image-88145\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/03\/4.jpg 800w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/03\/4-150x75.jpg 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/03\/4-300x150.jpg 300w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/03\/4-640x320.jpg 640w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>\u3042\u3068\u306f\u3001JavaScript\u304b\u3089\u30c0\u30a4\u30a2\u30ed\u30b0\u306e\u30dc\u30bf\u30f3\u3092\u53d6\u5f97\u3057\u3066\u4efb\u610f\u306e\u51e6\u7406\u3092\u5b9f\u884c\u3055\u305b\u308c\u3070\u5b8c\u6210\u3067\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nvar yes = document.getElementById('yes');\r\nvar no = document.getElementById('no');\r\n \r\n\/\/\u300c\u306f\u3044\u300d\u304c\u30af\u30ea\u30c3\u30af\u3055\u308c\u305f\u3089\r\nyes.addEventListener('click', function(){ console.log('yes') });\r\n \r\n\/\/\u300c\u3044\u3044\u3048\u300d\u304c\u30af\u30ea\u30c3\u30af\u3055\u308c\u305f\u3089\r\nno.addEventListener('click', function(){ console.log('no') });\r\n<\/pre>\n<p>\u307e\u305f\u3001\u30c0\u30a4\u30a2\u30ed\u30b0\u306e\u8868\u793a\u30fb\u975e\u8868\u793a\u306b\u95a2\u3057\u3066\u306fJavaScript\u304b\u3089\u6b21\u306e\u3088\u3046\u306a\u51e6\u7406\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<div class=\"box01\">\n<ul>\n<li>\u8868\u793a\uff1astyle.display = &#8216;none&#8217;<\/li>\n<li>\u975e\u8868\u793a\uff1astyle.display = &#8216;block&#8217;<\/li>\n<\/ul>\n<\/div>\n<p>\u30c0\u30a4\u30a2\u30ed\u30b0\u8981\u7d20\u3092\u53d6\u5f97\u3057\u305f\u3042\u3068\u306b\u3001\u4e0a\u8a18\u306e\u51e6\u7406\u3092\u5207\u308a\u66ff\u3048\u308b\u3053\u3068\u3067\u8868\u793a\u30fb\u975e\u8868\u793a\u3092\u5236\u5fa1\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u4eca\u56de\u306f\u3001JavaScript\u3067\u3055\u307e\u3056\u307e\u306a\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u8868\u793a\u30fb\u975e\u8868\u793a\u3059\u308b\u624b\u6cd5\u306b\u3064\u3044\u3066\u5b66\u7fd2\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u6700\u5f8c\u306b\u3001\u3082\u3046\u4e00\u5ea6\u30dd\u30a4\u30f3\u30c8\u3092\u304a\u3055\u3089\u3044\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n<p>\u30fb\u6587\u5b57\u5217\u306a\u3069\u3092\u8868\u793a\u3059\u308b\u306b\u306fdocument.write\u3084innerHTML\u304c\u3042\u308b<br \/>\n\u30fb\u753b\u50cf\u3092\u8868\u793a\u3059\u308b\u306b\u306fImage\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5229\u7528\u3059\u308b\u306e\u304c\u826f\u3044<br \/>\n\u30fb\u30dd\u30c3\u30d7\u30a2\u30c3\u30d7\u3092\u8868\u793a\u3059\u308b\u306b\u306falert\u304c\u3042\u308b<\/p>\n<p>\u4e0a\u8a18\u5185\u5bb9\u3092\u8e0f\u307e\u3048\u3066\u3001\u305c\u3072\u81ea\u5206\u3067\u3082\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u53d6\u308a\u5165\u308c\u3066\u6d3b\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u9811\u5f35\u308a\u307e\u3057\u3087\u3046\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u305d\u3082\u305d\u3082JavaScript\u3067\u8868\u793a\u3067\u304d\u308b\u3082\u306e\u3063\u3066\u4f55\uff1f \u6587\u5b57\u3084\u753b\u50cf\u306b\u30dd\u30c3\u30d7\u30a2\u30c3\u30d7\u306a\u3069\u3092\u8868\u793a\u3059\u308b\u65b9\u6cd5\u304c\u77e5\u308a\u305f\u3044 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