{"id":7569,"date":"2022-12-07T00:54:41","date_gmt":"2022-12-06T15:54:41","guid":{"rendered":"https:\/\/kininariantenna.com\/?p=7569"},"modified":"2022-12-07T00:54:54","modified_gmt":"2022-12-06T15:54:54","slug":"javascript%e3%81%ae%e3%82%a2%e3%83%ad%e3%83%bc%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%ef%bc%81%e3%83%a1%e3%83%aa%e3%83%83%e3%83%88%e3%82%82%e3%81%be%e3%81%a8%e3%82%81%ef%bc%81","status":"publish","type":"post","link":"https:\/\/kininariantenna.com\/?p=7569","title":{"rendered":"JavaScript\u306e\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u4f7f\u3044\u65b9\uff01\u30e1\u30ea\u30c3\u30c8\u3082\u307e\u3068\u3081\uff01"},"content":{"rendered":"<p>\u3051\u3069\u3001\u305d\u3093\u306a\u4e2d\u3067\u60a9\u3080\u3053\u3068\u306f\u3001<\/p>\n<div class=\"kininarukoto1\">\u30fbJavaScript\u306e\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u4f7f\u3044\u65b9\u304c\u308f\u304b\u3089\u306a\u3044<br \/>\n\u30fbJavaScript\u306e\u30a2\u30ed\u30fc\u95a2\u6570\u3092\u4f7f\u3046\u30e1\u30ea\u30c3\u30c8\u304c\u308f\u304b\u3089\u306a\u3044<\/div>\n<p>\u3067\u3059\u3088\u306d\u3002<\/p>\n<p>\u4eca\u56de\u306f\u305d\u3093\u306a\u304a\u60a9\u307f\u3092\u89e3\u6c7a\u3059\u308b<\/p>\n<div class=\"rdinfo\">\u30fbJavaScript\u306e\u30a2\u30ed\u30fc\u95a2\u6570\u65b9\u6cd5<br \/>\n\u30fbJavaScript\u306elet\u3001const\u3068var\u306e\u9055\u3044<\/div>\n<p>\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u307e\u3059\uff01<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_46 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">\u3082\u304f\u3058<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/kininariantenna.com\/?p=7569\/#JavaScript%E3%81%AE%E3%82%A2%E3%83%AD%E3%83%BC%E9%96%A2%E6%95%B0%E3%81%AB%E3%81%A4%E3%81%84%E3%81%A6\" title=\"JavaScript\u306e\u30a2\u30ed\u30fc\u95a2\u6570\u306b\u3064\u3044\u3066\">JavaScript\u306e\u30a2\u30ed\u30fc\u95a2\u6570\u306b\u3064\u3044\u3066<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/kininariantenna.com\/?p=7569\/#JavaScript%E3%81%AE%E3%82%A2%E3%83%AD%E3%83%BC%E9%96%A2%E6%95%B0%E3%81%A8%E3%81%AF\" title=\"JavaScript\u306e\u30a2\u30ed\u30fc\u95a2\u6570\u3068\u306f\">JavaScript\u306e\u30a2\u30ed\u30fc\u95a2\u6570\u3068\u306f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/kininariantenna.com\/?p=7569\/#%E3%82%A2%E3%83%AD%E3%83%BC%E9%96%A2%E6%95%B0%E3%81%AE%E6%A7%8B%E6%96%87\" title=\"\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u69cb\u6587\">\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u69cb\u6587<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/kininariantenna.com\/?p=7569\/#JavaScript%E3%81%AE%E3%82%A2%E3%83%AD%E3%83%BC%E9%96%A2%E6%95%B0%E3%82%92%E4%BD%BF%E3%81%86%E3%83%A1%E3%83%AA%E3%83%83%E3%83%88\" title=\"JavaScript\u306e\u30a2\u30ed\u30fc\u95a2\u6570\u3092\u4f7f\u3046\u30e1\u30ea\u30c3\u30c8\">JavaScript\u306e\u30a2\u30ed\u30fc\u95a2\u6570\u3092\u4f7f\u3046\u30e1\u30ea\u30c3\u30c8<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/kininariantenna.com\/?p=7569\/#%E3%82%B3%E3%83%BC%E3%83%89%E3%82%92%E7%9F%AD%E3%81%8F%E3%81%A7%E3%81%8D%E3%82%8B\" title=\"\u30b3\u30fc\u30c9\u3092\u77ed\u304f\u3067\u304d\u308b\">\u30b3\u30fc\u30c9\u3092\u77ed\u304f\u3067\u304d\u308b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/kininariantenna.com\/?p=7569\/#this%E3%81%AE%E5%80%A4%E3%81%AF%E9%96%A2%E6%95%B0%E5%AE%9A%E7%BE%A9%E6%99%82%E3%81%AB%E6%B1%BA%E3%82%81%E3%82%89%E3%82%8C%E3%82%8B\" title=\"this\u306e\u5024\u306f\u95a2\u6570\u5b9a\u7fa9\u6642\u306b\u6c7a\u3081\u3089\u308c\u308b\">this\u306e\u5024\u306f\u95a2\u6570\u5b9a\u7fa9\u6642\u306b\u6c7a\u3081\u3089\u308c\u308b<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/kininariantenna.com\/?p=7569\/#%E3%81%95%E3%81%84%E3%81%94%E3%81%AB\" title=\"\u3055\u3044\u3054\u306b\">\u3055\u3044\u3054\u306b<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"JavaScript%E3%81%AE%E3%82%A2%E3%83%AD%E3%83%BC%E9%96%A2%E6%95%B0%E3%81%AB%E3%81%A4%E3%81%84%E3%81%A6\"><\/span>JavaScript\u306e\u30a2\u30ed\u30fc\u95a2\u6570\u306b\u3064\u3044\u3066<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><P>JavaScript\u306e\u30a2\u30ed\u30fc\u95a2\u6570\u306b\u3064\u3044\u3066\u8aac\u660e\u3092\u3057\u307e\u3059\u3002<\/P><\/p>\n<h3><span class=\"ez-toc-section\" id=\"JavaScript%E3%81%AE%E3%82%A2%E3%83%AD%E3%83%BC%E9%96%A2%E6%95%B0%E3%81%A8%E3%81%AF\"><\/span>JavaScript\u306e\u30a2\u30ed\u30fc\u95a2\u6570\u3068\u306f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><P>JavaScript\u306e\u30a2\u30ed\u30fc\u95a2\u6570\u3068\u306f\u3001ES6\u304b\u3089\u5c0e\u5165\u3055\u308c\u305f\u95a2\u6570\u3067\u3001\u5f93\u6765Function\u3092\u4f7f\u7528\u3057\u305f\u95a2\u6570\u5f0f\u3092\u7c21\u7565\u5316\u3057\u305f\u3082\u306e\u3067\u3059\u3002<br \/>\n=>\u306e\u90e8\u5206\u304c\u77e2\u306b\u4f3c\u3066\u3044\u308b\u3053\u3068\u304b\u3089\u30a2\u30ed\u30fc\u95a2\u6570\u3068\u547c\u3070\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/P><\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E3%82%A2%E3%83%AD%E3%83%BC%E9%96%A2%E6%95%B0%E3%81%AE%E6%A7%8B%E6%96%87\"><\/span>\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u69cb\u6587<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><P>\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/P><\/p>\n<div class=\"info\"><code>(\u5f15\u6570,  ..) =&gt; {<br \/>\n\u51e6\u7406;<br \/>\n};<\/code><\/div>\n<p><P>\u307e\u305f\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u7d50\u679c\u3092\u76f4\u63a5\u5909\u6570\u306b\u6e21\u3059\u5834\u5408\u306f\u4ee5\u4e0b\u306e\u69cb\u6587\u3068\u306a\u308a\u307e\u3059\u3002<\/P><\/p>\n<div class=\"info\"><code>let\u307e\u305f\u306fconst \u5909\u6570\u540d = (\u5f15\u6570,  ...) =&gt; {<br \/>\n \u51e6\u7406<br \/>\n};<\/code><\/div>\n<p><P>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/P><br \/>\n<P>\u307e\u305a\u306f\u5f93\u6765\u578b\u306efunction\u3092\u4f7f\u7528\u3057\u305f\u95a2\u6570\u5f0f\u3067\u3059\u3002<\/P><\/p>\n<pre style=\"padding: 0;\"><code class=\"language-javascript line-numbers\">function value(num){\r\n\treturn num * 2;\r\n}\r\nconsole.log(value(4));<\/code><\/pre>\n<p><P>\u7d50\u679c\u3067\u3059\u3002<\/P><\/p>\n<div class=\"info\"><code>8<\/code><\/div>\n<p><P>\u6b21\u306f\u30a2\u30ed\u30fc\u95a2\u6570\u306b\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/P><\/p>\n<pre style=\"padding: 0;\"><code class=\"language-javascript line-numbers\">const value = (num) =&gt;{\r\n\treturn num * 2;\r\n}\r\nconsole.log(value(4));<\/code><\/pre>\n<p><P>\u7d50\u679c\u3067\u3059\u3002<\/P><br \/>\n<P>\u306a\u304a\u3001\u5f15\u6570\u3092\u6e21\u3055\u306a\u3044\u5834\u5408\u306f\u95a2\u6570\u306e\u5b9a\u7fa9\u305d\u306e\u3082\u306e\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/P><\/p>\n<div class=\"info\"><code>8<\/code><\/div>\n<pre style=\"padding: 0;\"><code class=\"language-javascript line-numbers\">const value = (num) =&gt;{\r\n\treturn num * 2;\r\n}\r\nconsole.log(value);<\/code><\/pre>\n<p><!--\u5439\u304d\u51fa\u3057\u306f\u3058\u307e\u308a--><\/p>\n<div class=\"fukidashi1\">\n<div class=\"icon\">\n<div class=\"wphg\"><img loading=\"lazy\" src=\"\/wp-content\/uploads\/2021\/07\/taka_kao3.gif\" alt=\"\u30bf\u30ab\u30d2\u30ed\"  width=\"110\" height=\"110\" \/><\/div>\n<div class=\"iconfont\">\u30bf\u30ab\u30d2\u30ed<\/div>\n<\/div>\n<div class=\"bubble\">function\u304c\u306a\u3044\u5206\u6570\u5f0f\u304c\u3059\u3063\u304d\u308a\u3057\u307e\u3057\u305f\u306d\u3002<\/div>\n<\/div>\n<p><!--\u5439\u304d\u51fa\u3057\u7d42\u308f\u308a--><br \/>\n<P>\u7d50\u679c\u3067\u3059\u3002<\/P><\/p>\n<div class=\"info\"><code>(num) =&gt;{<br \/>\n    return num * 2;<br \/>\n}<\/code><\/div>\n<p><!--\u5439\u304d\u51fa\u3057\u306f\u3058\u307e\u308a--><\/p>\n<div class=\"fukidashi1\">\n<div class=\"icon\">\n<div class=\"wphg\"><img loading=\"lazy\" src=\"\/wp-content\/uploads\/2021\/07\/taka_kao3.gif\" alt=\"\u30bf\u30ab\u30d2\u30ed\"  width=\"110\" height=\"110\" \/><\/div>\n<div class=\"iconfont\">\u30bf\u30ab\u30d2\u30ed<\/div>\n<\/div>\n<div class=\"bubble\">\u30a2\u30ed\u30fc\u95a2\u6570\u306a\u3069\u95a2\u6570\u3092\u4f7f\u3046\u5834\u5408\u306f\u5f15\u6570\u3092\u5fc5\u305a\u6307\u5b9a\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/div>\n<\/div>\n<p><!--\u5439\u304d\u51fa\u3057\u7d42\u308f\u308a--><br \/>\n<P>\u306a\u304a\u3001\u5f15\u6570\u3092\u7a7a\u306b\u3057\u3066\u307f\u308b\u3068\u3001NaN\u306e\u7d50\u679c\u3068\u306a\u308a\u307e\u3059\u3002<\/P><\/p>\n<pre style=\"padding: 0;\"><code class=\"language-javascript line-numbers\">const value = (num) =&gt;{\r\n\treturn num * 2;\r\n}\r\nconsole.log(value());<\/code><\/pre>\n<p><P>\u7d50\u679c\u3067\u3059\u3002<\/P><\/p>\n<div class=\"info\"><code>NaN<\/code><\/div>\n<h2><span class=\"ez-toc-section\" id=\"JavaScript%E3%81%AE%E3%82%A2%E3%83%AD%E3%83%BC%E9%96%A2%E6%95%B0%E3%82%92%E4%BD%BF%E3%81%86%E3%83%A1%E3%83%AA%E3%83%83%E3%83%88\"><\/span>JavaScript\u306e\u30a2\u30ed\u30fc\u95a2\u6570\u3092\u4f7f\u3046\u30e1\u30ea\u30c3\u30c8<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"%E3%82%B3%E3%83%BC%E3%83%89%E3%82%92%E7%9F%AD%E3%81%8F%E3%81%A7%E3%81%8D%E3%82%8B\"><\/span>\u30b3\u30fc\u30c9\u3092\u77ed\u304f\u3067\u304d\u308b<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><P>JavaScript\u306f\u30d6\u30e9\u30a6\u30b6\u304b\u3089\u8aad\u307f\u8fbc\u307e\u308c\u308b\u30e9\u30a4\u30d6\u30e9\u30ea\u306a\u306e\u3067\u3001\u5c11\u3057\u3067\u3082\u30b3\u30fc\u30c9\u3092\u77ed\u304f\u3001\u7701\u7565\u3057\u305f\u3044\u6c17\u6301\u3061\u304c\u3042\u308a\u307e\u3059\u3002<\/P><br \/>\n<P>\u30a2\u30ed\u30fc\u95a2\u6570\u306ffunction\u306e\u8a18\u8ff0\u304c\u4e0d\u8981\u3068\u306a\u308b\u305f\u3081\u3001\u305d\u306e\u5206\u30b3\u30fc\u30c9\u3082\u77ed\u304f\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/P><br \/>\n<P>\u5148\u307b\u3069\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u3055\u3089\u306b\u77ed\u304f\u3057\u305f\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/P><\/p>\n<pre style=\"padding: 0;\"><code class=\"language-javascript line-numbers\">const value = (num) =&gt; num * 2;\r\nconsole.log(value(10));<\/code><\/pre>\n<p><P>\u7d50\u679c\u3067\u3059\u3002<\/P><\/p>\n<div class=\"info\"><code>20<\/code><\/div>\n<h3><span class=\"ez-toc-section\" id=\"this%E3%81%AE%E5%80%A4%E3%81%AF%E9%96%A2%E6%95%B0%E5%AE%9A%E7%BE%A9%E6%99%82%E3%81%AB%E6%B1%BA%E3%82%81%E3%82%89%E3%82%8C%E3%82%8B\"><\/span>this\u306e\u5024\u306f\u95a2\u6570\u5b9a\u7fa9\u6642\u306b\u6c7a\u3081\u3089\u308c\u308b<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><P>\u6b21\u306e\u30e1\u30ea\u30c3\u30c8\u306fthis\u306e\u5024\u306f\u95a2\u6570\u5b9a\u7fa9\u6642\u306b\u6c7a\u3081\u3089\u308c\u308b\u3068\u3044\u3046\u70b9\u3067\u3059\u3002<\/P><br \/>\n<P>this\u3068\u306f\u30b9\u30af\u30ea\u30d7\u30c8\u5185\u306e\u3069\u3053\u304b\u3089\u3067\u3082\u5229\u7528\u3067\u304d\u308b\u7279\u5225\u306a\u5909\u6570\u306e\u3053\u3068\u3067\u3059\u3002<\/P><br \/>\n<P>\u306a\u306b\u3082\u5ba3\u8a00\u3092\u3057\u306a\u3044\u3068\u3001object Window\u300cJavaScript\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u968e\u5c64\u6700\u4e0a\u4f4d\u306b\u4f4d\u7f6e\u3059\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u300d\u3092\u304c\u3063\u3064\u308a\u3082\u3063\u3066\u304d\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/P><br \/>\n<P>\u5ba3\u8a00\u3092\u3059\u308b\u3053\u3068\u3067\u4e2d\u8eab\u304c\u5909\u5316\u3092\u3055\u305b\u3066\u3044\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/P><br \/>\n<P>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/P><\/p>\n<pre style=\"padding: 0;\"><code class=\"language-javascript line-numbers\">const objTest = {\r\n    name: '\u540d\u524d\u3067\u3059',\r\n    show: function() {\r\n        const show = () =&gt; {\r\n            console.log(this.name);\r\n        };\r\n        show();\r\n    }\r\n};\r\nobjTest.show();<\/code><\/pre>\n<p><P>\u7d50\u679c\u3067\u3059\u3002<\/P><\/p>\n<div class=\"info\"><code>\"\u540d\u524d\u3067\u3059\"<\/code><\/div>\n<p><P>objTest\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092This\u3068\u3057\u3066\u53d7\u3051\u53d6\u308a\u3001\u305d\u306ename\u306e\u5024\u3092\u8868\u793a\u3055\u305b\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u306d\u3002<\/P><br \/>\n<P>\u30a2\u30ed\u30fc\u95a2\u6570\u3092\u5165\u308c\u308b\u5834\u6240\u306b\u3088\u3063\u3066This\u3092\u78ba\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3068\u3044\u3046\u308f\u3051\u3067\u3059\u3002<\/P><\/p>\n<h2><span class=\"ez-toc-section\" id=\"%E3%81%95%E3%81%84%E3%81%94%E3%81%AB\"><\/span>\u3055\u3044\u3054\u306b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u3044\u304b\u304c\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p>\u4eca\u56de\u306f\u3001<\/p>\n<div class=\"endinfo\">\u30fbJavaScript\u306e\u30a2\u30ed\u30fc\u95a2\u6570\u65b9\u6cd5<br 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\u30fbJavaScript\u306e\u30a2\u30ed\u30fc&#8230;<\/p>\n","protected":false},"author":1,"featured_media":7389,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[168],"tags":[182],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.4.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>JavaScript\u306e\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u4f7f\u3044\u65b9\uff01\u30e1\u30ea\u30c3\u30c8\u3082\u307e\u3068\u3081\uff01 - \u30ad\u30cb\u30ca\u30ea\u30a2\u30f3\u30c6\u30ca<\/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:\/\/kininariantenna.com\/?p=7569\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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