{"id":27019,"date":"2017-07-11T20:13:44","date_gmt":"2017-07-11T11:13:44","guid":{"rendered":"http:\/\/www.sejuku.net\/blog\/?p=27019"},"modified":"2025-12-29T17:09:17","modified_gmt":"2025-12-29T08:09:17","slug":"%e3%80%90javascript%e5%85%a5%e9%96%80%e3%80%91getelementbyid%e3%82%92%e5%ae%8c%e5%85%a8%e7%90%86%e8%a7%a3%e3%81%99%e3%82%8b3%e3%81%a4%e3%81%ae%e3%82%b3%e3%83%84%ef%bc%81","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/27019","title":{"rendered":"\u3010JavaScript\u5165\u9580\u3011getElementById\u3092\u5b8c\u5168\u7406\u89e3\u3059\u308b3\u3064\u306e\u30b3\u30c4\uff01"},"content":{"rendered":"\n<p>\u307f\u306a\u3055\u3093\u3053\u3093\u306b\u3061\u306f\uff01Kotono\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u4eca\u56de\u306fJavaScript\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u983b\u7e6b\u306b\u898b\u304b\u3051\u308b\u3001getElementById\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u3056\u3063\u304f\u308a\u3068\u89e3\u8aac\u3057\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002getElementById\u3092\u4f7f\u3046\u3068\u3001HTML\u8981\u7d20\u306e\u53d6\u5f97\u3092\u7c21\u5358\u306b\u884c\u3046\u4e8b\u304c\u51fa\u6765\u3066\u3068\u3066\u3082\u4fbf\u5229\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f<\/p>\n\n\n<div class=\"box01\">\n\n\n\n<ul class=\"wp-block-list\">\n<li><b>getElementById\u3068\u306f<\/b><\/li>\n\n\n\n<li><b>\u8981\u7d20\u306e\u53d6\u5f97\u65b9\u6cd5<\/b><\/li>\n\n\n\n<li><b>getElementById\u306e\u6ce8\u610f\u70b9<\/b><\/li>\n\n\n\n<li><b>getElementById\u306e\u6d3b\u7528\u4e8b\u4f8b<\/b><\/li>\n<\/ul>\n\n\n<\/div>\n\n\n\n<p>\u306a\u3069\u3092\u3001\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u4ea4\u3048\u306a\u304c\u3089\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"u-mb-ctrl u-mb-10\">\u300c\u72ec\u5b66\u3068\u4e26\u884c\u3057\u306a\u304c\u3089\u3001\u526f\u696d\u3067\u7a3c\u3052\u308b\u3088\u3046\u306b\u306a\u308c\u308b\u304b\u306a&#8230;\u300d<\/p>\n\n<p class=\"u-mb-ctrl u-mb-10\">\u305d\u3093\u306a\u4e0d\u5b89\u3092\u62b1\u3048\u3066\u3044\u308b\u4eba\u306f\u3001\u305c\u3072\u300c<strong><a href=\"https:\/\/lp.sejuku.net\/lp1_blog_02\/?cid=lp_text_cta\">\u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2<\/a><\/strong>\u300d\u3092\u304a\u8a66\u3057\u304f\u3060\u3055\u3044\u3002<\/p>\n\n<p class=\"u-mb-ctrl u-mb-10\">\u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u3067\u306f\u73fe\u5f79\u30a8\u30f3\u30b8\u30cb\u30a2\u3068\u5b66\u7fd2\u30b3\u30fc\u30c1\u306e<strong><span class=\"swl-marker mark_yellow\">2\u540d\u4f53\u5236\u3067<\/span><\/strong>\u5b66\u7fd2\u3092\u30b5\u30dd\u30fc\u30c8\u3002\u30d5\u30ea\u30fc\u30e9\u30f3\u30b9\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u652f\u63f4\u3092\u53d7\u3051\u306a\u304c\u3089\u3001\u5b9f\u969b\u306e\u526f\u696d\u6848\u4ef6\u306b\u3082\u6311\u6226\u3067\u304d\u307e\u3059\u3002<\/p>\n\n<p class=\"u-mb-ctrl u-mb-10\">\u3053\u308c\u307e\u3067<strong><span class=\"swl-marker mark_yellow\">4\u4e075,000\u540d\u4ee5\u4e0a<\/span><\/strong><span class=\"swl-marker mark_yellow\">\u306e<\/span>\u53d7\u8b1b\u751f\u3092\u6307\u5c0e\u3057\u3066\u304d\u305f\u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u306a\u3089\u3001\u672a\u7d4c\u9a13\u304b\u3089\u3067\u3082\u632b\u6298\u306a\u304f\u526f\u696d\u3067\u306e\u53ce\u5165\u7372\u5f97\u306b\u76f4\u7d50\u3059\u308b\u30b9\u30ad\u30eb\u304c\u8eab\u306b\u3064\u3051\u3089\u308c\u307e\u3059\u3088\u3002<\/p>\n\n<p class=\"has-text-align-center u-mb-ctrl u-mb-0\">\uff3c \u7d66\u4ed8\u91d1\u3067\u53d7\u8b1b\u6599\u304c\u6700\u592780%OFF \uff0f<a href=\"https:\/\/lp.sejuku.net\/lp1_blog_02?cid=pro_howto_normal_pr_Normal_sbid-3286\"><\/a><\/p>\n\n<div class=\"swell-block-button is-style-btn_shiny\" data-id=\"2b3d06a9\"><a href=\"https:\/\/lp.sejuku.net\/lp1_blog_02\/?cid=lp_text_cta\" class=\"swell-block-button__link\"><span>\u516c\u5f0f\u30b5\u30a4\u30c8\u3067\u8a73\u7d30\u3092\u898b\u308b<\/span><\/a><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">getElementById\u3068\u306f\uff1f<\/h2>\n\n\n\n<p>\u307f\u306a\u3055\u3093\u306fgetElementById\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u304b\uff1f\u305d\u3082\u305d\u3082\u3001getElementById\u304c\u4f55\u304b\u77e5\u3063\u3066\u3044\u307e\u3059\u304b\uff1f<\/p>\n\n\n\n<p>getElementById\u306f\u3001<b>\u4efb\u610f\u306eHTML\u30bf\u30b0\u3067\u6307\u5b9a\u3057\u305fID\u306b\u30de\u30c3\u30c1\u3059\u308b\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u8981\u7d20\u3092\u53d6\u5f97\u3059\u308b\u30e1\u30bd\u30c3\u30c9<\/b>\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u5f15\u6570\u3068\u3057\u3066ID\u3067\u3042\u308bString\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8981\u3057\u3001\u623b\u308a\u5024\u306f\u53d6\u5f97\u3057\u305f\u8981\u7d20\u3067\u3059\u3002\u4efb\u610f\u306e\u8981\u7d20\u3092\u62bd\u51fa\u3057\u3001\u305d\u306e\u5185\u5bb9\u3092\u5909\u66f4\u3057\u305f\u3044\u5834\u5408\u306a\u3069\u3001\u69d8\u3005\u306a\u30b7\u30c1\u30e5\u30a8\u30fc\u30b7\u30e7\u30f3\u3067\u6d3b\u8e8d\u3059\u308b\u95a2\u6570\u3067\u3059\u3002<\/p>\n\n\n\n<p><b>\u57fa\u672c\u7684\u306bID\u306f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u5185\u3067\u91cd\u8907\u3057\u3066\u306f\u306a\u3089\u306a\u3044<\/b>\u306e\u3067\u3001getElementById\u306b\u3088\u3063\u3066\u53d6\u5f97\u3055\u308c\u308b\u8981\u7d20\u306f\u4e00\u3064\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u57fa\u672c\u7684\u306a\u66f8\u304d\u65b9\u306b\u3064\u3044\u3066<\/h3>\n\n\n\n<p>\u3067\u306f\u3001\u5b9f\u969b\u306b\u4f7f\u7528\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">&lt;html&gt;\n &lt;body&gt;\n\n  &lt;p id=\"myid\"&gt;Hello world!&lt;\/p&gt;\n\n  &lt;script&gt;\n   console.log(document.getElementById(\"myid\"));\n  &lt;\/script&gt;\n\n &lt;\/body&gt;\n&lt;\/html&gt;\n<\/pre>\n\n\n\n<p>\u51fa\u529b\u7d50\u679c<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">&lt;p id=\"myid\"&gt;Hello world!&lt;\/p&gt;\n<\/pre>\n\n\n\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001p\u30bf\u30b0\u3092ID\u3067\u62bd\u51fa\u3057\u3066JavaScript\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u8868\u793a\u3055\u305b\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>p\u30bf\u30b0\u306eID\u540d\u304cmyid\u306a\u306e\u3067\u3001getElementById\u306e\u5f15\u6570\u3068\u3057\u3066\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u8981\u7d20\u3092\u53d6\u5f97\u3057\u3088\u3046<\/h3>\n\n\n\n<p>\u3067\u306f\u3001\u5b9f\u969b\u306bHTML\u8981\u7d20\u3092\u53d6\u5f97\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">&lt;html&gt;\n &lt;body&gt;\n\n  &lt;p id=\"myid\"&gt;Hello world!&lt;\/p&gt;\n\n  &lt;script&gt;\n   console.log(document.getElementById(\"myid\").textContent);\n  &lt;\/script&gt;\n\n &lt;\/body&gt;\n&lt;\/html&gt;\n<\/pre>\n\n\n\n<p>\u4e0a\u8a18\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001p\u30bf\u30b0\u3092\u53d6\u5f97\u3057\u3066\u305d\u306e\u4e2d\u8eab\u3067\u3042\u308b\u6587\u5b57\u5217\u3092textContent\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4f7f\u7528\u3057\u3001JavaScript\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u8868\u793a\u3055\u305b\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u51fa\u529b\u7d50\u679c\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Hello world!\n<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u5909\u6570\u3067ID\u3092\u6307\u5b9a\u3057\u3088\u3046<\/h3>\n\n\n\n<p>\u4eca\u307e\u3067\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001getElementById\u306e\u5f15\u6570\u306b\u306fID\u540d\u306e\u6587\u5b57\u5217\u3092\u76f4\u63a5\u6307\u5b9a\u3057\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u3057\u304b\u3057\u3001<b>getElementById\u306e\u5f15\u6570\u306f\u5909\u6570\u3067\u3082\u4ee3\u66ff\u51fa\u6765\u308b<\/b>\u3093\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">&lt;html&gt;\n &lt;body&gt;\n\n  &lt;p id=\"myid\"&gt;Hello world!&lt;\/p&gt;\n\n  &lt;script&gt;\n   var id = \"myid\";\n\n   console.log(document.getElementById(id));\n  &lt;\/script&gt;\n\n &lt;\/body&gt;\n&lt;\/html&gt;\n<\/pre>\n\n\n\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">&lt;p id=\"myid\"&gt;Hello world!&lt;\/p&gt;\n<\/pre>\n\n\n\n<p>\u4e0a\u8a18\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001\u5909\u6570\u300cid\u300d\u306bp\u30bf\u30b0\u306eID\u540d\u3067\u3042\u308bmyid\u304c\u683c\u7d0d\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u3053\u3067\u3001\u3053\u306e\u5909\u6570\u3092getElementById\u306e\u5f15\u6570\u306b\u6307\u5b9a\u3059\u308c\u3070\u3001\u51fa\u529b\u7d50\u679c\u306b\u306fp\u30bf\u30b0\u8981\u7d20\u304c\u8868\u793a\u3055\u308c\u308b\u3068\u3044\u3046\u308f\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">getElementById\u306e\u6ce8\u610f\u70b9\uff01<\/h2>\n\n\n\n<p>getElementById\u3092\u4f7f\u7528\u3059\u308b\u306b\u3042\u305f\u3063\u3066\u3001<b>\u3088\u304f\u30c8\u30e9\u30d6\u30eb\u306b\u306a\u308a\u304c\u3061\u306a\u30b1\u30fc\u30b9\u3092\u4e8c\u3064<\/b>\u3054\u7d39\u4ecb\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u3053\u3067\u306f\u3001\u623b\u308a\u5024\u304cnull\u306b\u306a\u308b\u30b1\u30fc\u30b9\u3068\u3001\u540c\u3058ID\u304c\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u5185\u306b\u91cd\u8907\u3057\u3066\u3044\u308b\u30b1\u30fc\u30b9\u306b\u3064\u3044\u3066\u306e\u6ce8\u610f\u70b9\u3092\u89e3\u8aac\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u623b\u308a\u5024\u306e\u300cnull\u300d\u306b\u3064\u3044\u3066<\/h3>\n\n\n\n<p>\u6307\u5b9a\u3057\u305fID\u540d\u304cHTML\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u5185\u3067\u898b\u3064\u304b\u3089\u306a\u3044\u5834\u5408\u3001getElementById\u306e\u623b\u308a\u5024\u3068\u3057\u3066null\u304c\u8fd4\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">&lt;html&gt;\n &lt;body&gt;\n\n  &lt;p id=\"myid\"&gt;Hello world!&lt;\/p&gt;\n\n  &lt;script&gt;\n   console.log(document.getElementById(\"hello\"));\n  &lt;\/script&gt;\n\n &lt;\/body&gt;\n&lt;\/html&gt;\n<\/pre>\n\n\n\n<p>\u4e0a\u8a18\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306f\u3001p\u30bf\u30b0\u306eID\u304cmyId\u3067\u3042\u308b\u306e\u306b\u3082\u95a2\u308f\u3089\u305a\u3001getElementById\u306e\u5f15\u6570\u306b\u306fhello\u3068\u8a2d\u5b9a\u3057\u3066\u3057\u307e\u3063\u305f\u4f8b\u3067\u3059\u3002<\/p>\n\n\n\n<p>getElementById\u306f\u3001hello\u3068\u3044\u3046ID\u3092\u6301\u3064\u8981\u7d20\u304c\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u5185\u306b\u898b\u5f53\u305f\u3089\u306a\u3044\u305f\u3081\u3001\u623b\u308a\u5024\u3068\u3057\u3066null\u3092\u8fd4\u3059\u308f\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3088\u3063\u3066\u3001\u51fa\u529b\u7d50\u679c\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">null\n<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">ID\u304c\u8907\u6570\u3042\u308b\u5834\u5408\u306b\u3064\u3044\u3066<\/h3>\n\n\n\n<p>\u53cd\u5bfe\u306b\u3001<b>\u540c\u3058ID\u304c\u540c\u3058\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u5185\u306b\u91cd\u8907\u3057\u3066\u3057\u307e\u3063\u305f\u5834\u5408\u306f\u3001\u521d\u56de\u306b\u5408\u81f4\u3057\u305f\u8981\u7d20\u3057\u304b\u53d6\u5f97\u3055\u308c\u307e\u305b\u3093<\/b>\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">&lt;html&gt;\n &lt;body&gt;\n\n  &lt;p id=\"myid\"&gt;\u3053\u3093\u306b\u3061\u306f\uff01&lt;\/p&gt;\n  &lt;p id=\"myid\"&gt;\u3053\u3093\u3070\u3093\u306f\uff01&lt;\/p&gt;\n\n  &lt;script&gt;\n   console.log(document.getElementById(\"myid\"));\n  &lt;\/script&gt;\n\n &lt;\/body&gt;\n&lt;\/html&gt;\n<\/pre>\n\n\n\n<p>\u4e0a\u8a18\u30b3\u30fc\u30c9\u306b\u306f\u3001\u4e8c\u3064\u306ep\u30bf\u30b0\u304c\u5b58\u5728\u3057\u3066\u304a\u308a\u3001\u4e8c\u3064\u3068\u3082\u540c\u3058ID\u3092\u4fdd\u6709\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u306e\u70ba\u3001getElementById\u304cmyid\u3092ID\u540d\u3068\u3059\u308b\u8981\u7d20\u3092\u63a2\u3057\u51fa\u3059\u3068\u3001\u4e00\u756a\u76ee\u306b\u30de\u30c3\u30c1\u3057\u305f\u8981\u7d20\u306e\u307f\u623b\u308a\u5024\u3068\u3057\u3066\u8fd4\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u51fa\u529b\u7d50\u679c\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">&lt;p id=\"myid\"&gt;\u3053\u3093\u306b\u3061\u306f\uff01&lt;\/p&gt;\n<\/pre>\n\n\n\n<p>\u305d\u3082\u305d\u3082<b>ID\u306f\u3001\u4e00\u3064\u306eHTML\u306b\u56fa\u6709\u306e\u3082\u306e\u306a\u306e\u3067\u91cd\u8907\u3057\u306a\u3044\u3088\u3046\u306b\u6ce8\u610f<\/b>\u3092\u6255\u3044\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">getElementById\u306e\u6d3b\u7528\u4e8b\u4f8b\uff01<\/h2>\n\n\n\n<p>getElementById\u306f\u69d8\u3005\u306a\u30b7\u30c1\u30e5\u30a8\u30fc\u30b7\u30e7\u30f3\u306b\u5f79\u7acb\u3064\u30e1\u30bd\u30c3\u30c9\u306a\u306e\u3067\u3001\u30de\u30b9\u30bf\u30fc\u3057\u3066\u304a\u3044\u3066\u640d\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p>\u3053\u3053\u3067\u306f\u3001\u3044\u304f\u3064\u304b\u306e\u30b1\u30fc\u30b9\u3092\u3054\u7d39\u4ecb\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">innerHTML\u306e\u4f8b<\/h3>\n\n\n\n<p>innerHTML\u3068\u3044\u3046\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4f7f\u7528\u3059\u308c\u3070\u3001\u8981\u7d20\u306e\u4e2d\u8eab\u3092\u5909\u66f4\u3059\u308b\u4e8b\u304c\u51fa\u6765\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">&lt;html&gt;\n &lt;body&gt;\n\n  &lt;p id=\"myid\"&gt;\u3053\u3093\u306b\u3061\u306f\uff01&lt;\/p&gt;\n  &lt;input type=\"button\" value=\"Click\" onclick=\"myfunc()\"&gt;\n\n  &lt;script&gt;\n   var myfunc = function(){\n   var myp = document.getElementById(\"myid\");\n   myp.innerHTML = \"\u3053\u3093\u3070\u3093\u306f\uff01\";\n   }\n  &lt;\/script&gt;\n\n &lt;\/body&gt;\n&lt;\/html&gt;\n<\/pre>\n\n\n\n<p>\u4e0a\u8a18\u30b3\u30fc\u30c9\u3067\u306f\u3001innerHTML\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4f7f\u7528\u3057\u3066p\u30bf\u30b0\u306e\u4e2d\u8eab\u3092\u5909\u66f4\u3057\u3066\u307f\u307e\u3057\u305f\u3002Click\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b\u3068\u3001p\u30bf\u30b0\u5185\u306e\u6587\u5b57\u5217\u304c\u5909\u66f4\u3055\u308c\u308b\u3068\u3044\u3046\u4ed5\u7d44\u307f\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u753b\u50cf\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" width=\"300\" height=\"109\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/07\/2017-07-05-12-300x109.png\" alt=\"2017-07-05 (12)\" class=\"wp-image-27005\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/07\/2017-07-05-12-300x109.png 300w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/07\/2017-07-05-12-150x54.png 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/07\/2017-07-05-12.png 331w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/figure>\n\n\n\n\n\n\n\n<p>\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b\u3068\u3001\u6587\u5b57\u304c\u5909\u66f4\u3055\u308c\u305f\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u306d\uff01<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" width=\"300\" height=\"107\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/07\/2017-07-05-13-300x107.png\" alt=\"2017-07-05 (13)\" class=\"wp-image-27006\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/07\/2017-07-05-13-300x107.png 300w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/07\/2017-07-05-13-150x53.png 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/07\/2017-07-05-13.png 332w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/figure>\n\n\n\n\n\n\n\n<p>\u30af\u30ea\u30c3\u30af\u524d\u306f\u300c\u3053\u3093\u306b\u3061\u306f\uff01\u300d\u3068\u8868\u793a\u3055\u308c\u3066\u3044\u305f\u3082\u306e\u304c\u3001\u30af\u30ea\u30c3\u30af\u5f8c\u306f\u300c\u3053\u3093\u3070\u3093\u306f\uff01\u300d\u306b\u5909\u308f\u308a\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">value\u306e\u4f8b<\/h3>\n\n\n\n<p>HTML\u306e\u30d5\u30a9\u30fc\u30e0\u30bf\u30b0\u306evalue\u5c5e\u6027\u306e\u5024\u3092\u53d6\u5f97\u3001\u5909\u66f4\u3057\u305f\u3044\u5834\u5408\u306a\u3069\u306b\u3082\u3001getElementById\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>value\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001<b>value\u5c5e\u6027\u306e\u5024\u3092\u53d6\u5f97\u3001\u5909\u66f4\u3067\u304d\u307e\u3059<\/b>\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">&lt;html&gt;\n  &lt;body&gt;\n \n    &lt;p&gt;\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\uff01&lt;\/p&gt;\n    &lt;input type=\"button\" id=\"myid\" value=\"Click\"&gt;\n \n    &lt;script&gt;\n      console.log(document.getElementById(\"myid\").value);\n    &lt;\/script&gt;\n \n  &lt;\/body&gt;\n&lt;\/html&gt;<\/pre>\n\n\n\n<p>\u4e0a\u8a18\u30b3\u30fc\u30c9\u3067\u306f\u30dc\u30bf\u30f3\u306b\u8868\u793a\u3055\u308c\u3066\u3044\u308b\u6587\u5b57\u3092\u53d6\u5f97\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u51fa\u529b\u7d50\u679c\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Click<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">onClick\u306e\u4f8b<\/h3>\n\n\n\n<p>getElementById\u3067\u62bd\u51fa\u3057\u305f\u8981\u7d20\u306b\u3001\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9\u30fc\u3092\u7d50\u3073\u3064\u3051\u308b\u3053\u3068\u3082\u51fa\u6765\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4f8b\u3048\u3070\u3001\u30dc\u30bf\u30f3\u8981\u7d20\u3092\u53d6\u5f97\u3057\u3066\u30af\u30ea\u30c3\u30af\u3059\u308b\u3068\u3001\u6307\u5b9a\u3057\u305f\u95a2\u6570\u304c\u767a\u52d5\u3055\u308c\u308b\u4ed5\u7d44\u307f\u3082\u7c21\u5358\u306b\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">&lt;html&gt;\n &lt;body&gt;\n\n  &lt;p&gt;\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\uff01&lt;\/p&gt;\n  &lt;input type=\"button\" id=\"myid\" value=\"Click\"&gt;\n\n  &lt;script&gt;\n   var mybutton = document.getElementById(\"myid\");\n   var myfunc = function(){\n    mybutton.value = \"Hello world!\";\n   }\n   mybutton.onclick = myfunc;\n  &lt;\/script&gt;\n\n &lt;\/body&gt;\n&lt;\/html&gt;\n<\/pre>\n\n\n\n<p>\u4e0a\u8a18\u30b3\u30fc\u30c9\u3067\u306f\u3001Click\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b\u3068\u3001\u30dc\u30bf\u30f3\u306b\u8868\u793a\u3055\u308c\u3066\u3044\u308b\u6587\u5b57\u304c\u5909\u66f4\u3055\u308c\u308b\u4ed5\u7d44\u307f\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>getElementById\u3067\u62bd\u51fa\u3057\u305f\u30dc\u30bf\u30f3\u8981\u7d20\u3092mybutton\u5909\u6570\u306b\u683c\u7d0d\u3057\u3001\u305d\u306e\u5909\u6570\u306eonclick\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u5024\u3068\u3057\u3066myfunc\u95a2\u6570\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>myfunc\u95a2\u6570\u306f\u3001\u30dc\u30bf\u30f3\u8981\u7d20\u306evalue\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u5909\u66f4\u3057\u307e\u3059\u3002\u5148\u307b\u3069\u8aac\u660e\u3057\u307e\u3057\u305f\u304c\u3001value\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u3001\u30dc\u30bf\u30f3\u4e0a\u306b\u8868\u793a\u3055\u308c\u3066\u3044\u308b\u6587\u5b57\u5217\u306e\u3053\u3068\u3092\u6307\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u753b\u50cf\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<p>\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30dc\u30bf\u30f3\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" width=\"300\" height=\"108\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/07\/2017-07-05-14-300x108.png\" alt=\"2017-07-05 (14)\" class=\"wp-image-27007\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/07\/2017-07-05-14-300x108.png 300w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/07\/2017-07-05-14-150x54.png 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/07\/2017-07-05-14.png 332w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/figure>\n\n\n\n\n\n\n\n<p>\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b\u3068\u3001\u30dc\u30bf\u30f3\u4e0a\u306e\u6587\u5b57\u304c\u5909\u66f4\u3055\u308c\u305f\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u306d\uff01<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" width=\"300\" height=\"106\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/07\/2017-07-05-15-300x106.png\" alt=\"2017-07-05 (15)\" class=\"wp-image-27008\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/07\/2017-07-05-15-300x106.png 300w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/07\/2017-07-05-15-150x53.png 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/07\/2017-07-05-15.png 332w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/figure>\n\n\n\n\n\n\n\n<p>\u30af\u30ea\u30c3\u30af\u524d\u306fClick\u3068\u8868\u793a\u3057\u3066\u3044\u308b\u30dc\u30bf\u30f3\u304c\u3001\u30af\u30ea\u30c3\u30af\u5f8c\u306fHello world!\u306b\u5909\u308f\u308a\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">style\u306e\u4f8b<\/h3>\n\n\n\n<p>HTML\u5185\u306e\u6587\u5b57\u8272\u3092\u5909\u66f4\u3057\u305f\u3044\u5834\u5408\u306a\u3069\u306b\u3082\u3001getElementById\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u3002<\/p>\n\n\n\n<p>style\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u5024\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u7c21\u5358\u306b\u8272\u3084\u30b5\u30a4\u30ba\u3092\u5909\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">&lt;html&gt;\n &lt;body&gt;\n\n  &lt;p id = \"myid\"&gt;Hello world!&lt;\/p&gt;\n  &lt;input type=\"button\" id=\"myid\" value=\"Click\" onclick=\"myfunc()\"&gt;\n\n  &lt;script&gt;\n   var myfunc = function(){\n   var myp = document.getElementById(\"myid\");\n\n   myp.style = \"color:red;font-size:48px;\";\n   }\n  &lt;\/script&gt;\n\n &lt;\/body&gt;\n&lt;\/html&gt;\n<\/pre>\n\n\n\n<p>\u4e0a\u8a18\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001Click\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b\u3068\u3001p\u30bf\u30b0\u5185\u306e\u6587\u5b57\u5217\u306e\u8272\u3068\u5927\u304d\u3055\u304c\u5909\u66f4\u3055\u308c\u308b\u4ed5\u7d44\u307f\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>getElementById\u3067\u62bd\u51fa\u3057\u305f\u8981\u7d20myp\u306estyle\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u5024\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002\u4eca\u56de\u306f\u3001\u6587\u5b57\u3092\u8d64\u8272\uff06\u5927\u30b5\u30a4\u30ba\u306b\u5909\u66f4\u3057\u305f\u306e\u3067\u3001color:red;font-size:48px;\u3068\u8a2d\u5b9a\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u753b\u50cf\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u6587\u5b57\u3068\u30dc\u30bf\u30f3\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<figure 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