{"id":7689,"date":"2023-03-13T03:56:32","date_gmt":"2023-03-12T18:56:32","guid":{"rendered":"https:\/\/kininariantenna.com\/?p=7689"},"modified":"2023-03-13T03:57:09","modified_gmt":"2023-03-12T18:57:09","slug":"cannot-read-properties-of-undefined%e3%81%ae%e5%8e%9f%e5%9b%a0%e3%81%a8%e5%af%be%e5%87%a6%e6%b3%95%ef%bc%81javascript%e3%82%a8%e3%83%a9%e3%83%bc","status":"publish","type":"post","link":"http:\/\/kininariantenna.com\/?p=7689","title":{"rendered":"Cannot read properties of undefined\u306e\u539f\u56e0\u3068\u5bfe\u51e6\u6cd5\uff01JavaScript\u30a8\u30e9\u30fc"},"content":{"rendered":"<p>JavaScript\u30a8\u30e9\u30fc\u300cCannot read properties of undefined\u300d\u304c\u8868\u793a\u3055\u308c\u56f0\u3063\u305f\u3053\u3068\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p>\u3051\u3069\u3001\u305d\u3093\u306a\u4e2d\u3067\u60a9\u3080\u3053\u3068\u306f\u3001<\/p>\n<div class=\"kininarukoto1\">\u30fbJavaScript\u30a8\u30e9\u30fc\u300cCannot read properties of undefined\u300d\u306e\u539f\u56e0\u3068\u5bfe\u51e6\u6cd5\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\u30a8\u30e9\u30fc\u300cCannot read properties of undefined\u300d\u306e\u539f\u56e0\u3068\u5bfe\u51e6\u6cd5<\/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=\"http:\/\/kininariantenna.com\/?p=7689\/#JavaScript%E3%82%A8%E3%83%A9%E3%83%BC%E3%80%8CCannot_read_properties_of_undefined%E3%80%8D%E3%81%AE%E5%8E%9F%E5%9B%A0\" title=\"JavaScript\u30a8\u30e9\u30fc\u300cCannot read properties of undefined\u300d\u306e\u539f\u56e0\">JavaScript\u30a8\u30e9\u30fc\u300cCannot read properties of undefined\u300d\u306e\u539f\u56e0<\/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=\"http:\/\/kininariantenna.com\/?p=7689\/#%E3%82%A8%E3%83%A9%E3%83%BC%E3%82%92%E5%86%8D%E7%8F%BE\" title=\"\u30a8\u30e9\u30fc\u3092\u518d\u73fe\">\u30a8\u30e9\u30fc\u3092\u518d\u73fe<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"http:\/\/kininariantenna.com\/?p=7689\/#JavaScript%E3%82%A8%E3%83%A9%E3%83%BC%E3%80%8CCannot_read_properties_of_undefined%E3%80%8D%E3%81%AE%E5%AF%BE%E5%87%A6%E6%B3%95\" title=\"JavaScript\u30a8\u30e9\u30fc\u300cCannot read properties of undefined\u300d\u306e\u5bfe\u51e6\u6cd5\">JavaScript\u30a8\u30e9\u30fc\u300cCannot read properties of undefined\u300d\u306e\u5bfe\u51e6\u6cd5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"http:\/\/kininariantenna.com\/?p=7689\/#%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%82%A8%E3%83%A9%E3%83%BC%E3%80%8CCannot_read_properties_of_undefined%E3%80%8D%E3%81%AE%E5%8E%9F%E5%9B%A0\"><\/span>JavaScript\u30a8\u30e9\u30fc\u300cCannot read properties of undefined\u300d\u306e\u539f\u56e0<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u3053\u306e\u30a8\u30e9\u30fc\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304cundefined\u307e\u305f\u306fnull\u3067\u3042\u308b\u305f\u3081\u3001\u305d\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044\u5834\u5408\u306b\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E3%82%A8%E3%83%A9%E3%83%BC%E3%82%92%E5%86%8D%E7%8F%BE\"><\/span>\u30a8\u30e9\u30fc\u3092\u518d\u73fe<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u30a8\u30e9\u30fc\u3092\u518d\u73fe\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u5165\u529b\u3057\u307e\u3059\u3002<\/p>\n<pre style=\"padding: 0;\"><code class=\"language-javascript line-numbers\">const value = { title: \"title1\", no: 30 };\r\nconsole.log(value.detail.num);<\/code><\/pre>\n<p>\u7d50\u679c\u3067\u3059\u3002<\/p>\n<div class=\"info\"><code>Uncaught TypeError: Cannot read properties of undefined (reading 'num')<\/code><\/div>\n<p>\u30ad\u30e3\u30c3\u30c1\u3055\u308c\u3066\u3044\u306a\u3044Type\u306eError\u3067\u3059\u3002 \u672a\u5b9a\u7fa9\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u8aad\u307f\u53d6\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093 (&#8216;num&#8217;\u8aad\u307f\u8fbc\u307f\u6642)\u3068\u3044\u3046\u5185\u5bb9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\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\">React\u3067\u3082\u3088\u304f\u51fa\u304f\u308f\u3059\u30a8\u30e9\u30fc\u3067\u3059\u306d\u3002<\/div>\n<\/div>\n<p><!--\u5439\u304d\u51fa\u3057\u7d42\u308f\u308a--><\/p>\n<h2><span class=\"ez-toc-section\" id=\"JavaScript%E3%82%A8%E3%83%A9%E3%83%BC%E3%80%8CCannot_read_properties_of_undefined%E3%80%8D%E3%81%AE%E5%AF%BE%E5%87%A6%E6%B3%95\"><\/span>JavaScript\u30a8\u30e9\u30fc\u300cCannot read properties of undefined\u300d\u306e\u5bfe\u51e6\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u5b58\u5728\u3059\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u6307\u5b9a\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<br \/>\n\u4e0a\u8a18\u30b3\u30fc\u30c9\u306e\u4fee\u6b63\u4f8b\u3067\u3059\u3002<\/p>\n<pre style=\"padding: 0;\"><code class=\"language-javascript line-numbers\">const value = { title: \"title1\", no: 30 };\r\nconsole.log(value.no);<\/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\">\u5b58\u5728\u3057\u306a\u3044\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u6307\u5b9a\u3057\u306a\u3044\u3088\u3046\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/div>\n<\/div>\n<p><!--\u5439\u304d\u51fa\u3057\u7d42\u308f\u308a--><\/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\u30a8\u30e9\u30fc\u300cCannot read properties of undefined\u300d\u306e\u539f\u56e0\u3068\u5bfe\u51e6\u6cd5<\/div>\n<p>\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/p>\n<p>\u307e\u305f\u3001\u4ed6\u306b\u3082\u4fbf\u5229\u306a\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u306e\u3067\u3001\u3088\u308d\u3057\u3051\u308c\u3070\u3054\u53c2\u7167\u9802\u3051\u308c\u3070\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript\u30a8\u30e9\u30fc\u300cCannot read properties of undefined\u300d\u304c\u8868\u793a\u3055\u308c\u56f0\u3063\u305f\u3053\u3068\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002 \u3051\u3069\u3001\u305d\u3093\u306a\u4e2d\u3067\u60a9\u3080\u3053\u3068\u306f\u3001 \u30fbJavaScript\u30a8\u30e9\u30fc\u300cCannot rea&#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":[142],"yoast_head":"<!-- This site is optimized 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