{"id":23942,"date":"2017-08-21T14:47:19","date_gmt":"2017-08-21T05:47:19","guid":{"rendered":"http:\/\/www.sejuku.net\/blog\/?p=23942"},"modified":"2024-05-06T11:42:43","modified_gmt":"2024-05-06T02:42:43","slug":"%e3%80%90javascript%e5%85%a5%e9%96%80%e3%80%91%e6%af%94%e8%bc%83%e6%bc%94%e7%ae%97%e5%ad%90%e3%82%92%e3%83%9e%e3%82%b9%e3%82%bf%e3%83%bc%e3%81%99%e3%82%8b5%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\/23942","title":{"rendered":"\u3010JavaScript\u5165\u9580\u3011\u6bd4\u8f03\u6f14\u7b97\u5b50\u306e\u4f7f\u3044\u65b9\u307e\u3068\u3081 (==\/===\/OR\/AND)"},"content":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\u3001\u30e9\u30a4\u30bf\u30fc\u306e\u30de\u30b5\u30c8\u3067\u3059\uff01<\/p>\n<p>\u4eca\u56de\u306f\u30012\u3064\u306e\u5024\u3092\u6bd4\u8f03\u3057\u3066\u6761\u4ef6\u5206\u5c90\u306a\u3069\u3092\u884c\u3046\u51e6\u7406\u306b\u3088\u304f\u4f7f\u308f\u308c\u308b\u300c\u6bd4\u8f03\u6f14\u7b97\u5b50\u300d\u306b\u3064\u3044\u3066\u5b66\u7fd2\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001<br \/>\n<div class=\"box01\"><\/p>\n<ul>\n<li><b>\u6bd4\u8f03\u6f14\u7b97\u5b50\u3068\u306f\uff1f<\/b><\/li>\n<li><b>\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/b><\/li>\n<li><b>\u6570\u5024\u306e\u6bd4\u8f03<\/b><\/li>\n<li><b>\u6587\u5b57\u5217\u306e\u6bd4\u8f03<\/b><\/li>\n<li><b>Boolean\u306e\u6bd4\u8f03<\/b><\/li>\n<\/ul>\n<\/div>\n<p>\u3068\u3044\u3046\u57fa\u672c\u7684\u306a\u5185\u5bb9\u304b\u3089\u3001<br \/>\n<div class=\"box01\"><\/p>\n<ul>\n<li><b>\u300c==\u300d\u3068\u300c=== (\u30a4\u30b3\u30fc\u30eb3\u3064)\u300d\u306e\u9055\u3044<\/b><\/li>\n<li><b>\u8907\u6570\u306e\u6761\u4ef6\u3092\u6bd4\u8f03\u3057\u3088\u3046<\/b><\/li>\n<li><b>null\u3068undefined\u306e\u6bd4\u8f03\u306b\u3064\u3044\u3066<\/b><\/li>\n<\/ul>\n<\/div>\n<p>\u306a\u3069\u306e\u5fdc\u7528\u7684\u306a\u4f7f\u3044\u65b9\u306b\u95a2\u3057\u3066\u3082\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u3001\u6bd4\u8f03\u6f14\u7b97\u5b50\u3092\u697d\u3057\u304f\u5b66\u7fd2\u3057\u3066\u81ea\u5206\u306e\u30b9\u30ad\u30eb\u30a2\u30c3\u30d7\u3092\u76ee\u6307\u3057\u307e\u3057\u3087\u3046\uff01<\/p>\n<h2>\u6bd4\u8f03\u6f14\u7b97\u5b50\u3068\u306f\uff1f<\/h2>\n<p>\u305d\u308c\u3067\u306f\u3001\u307e\u305a\u6700\u521d\u306b\u300c\u6bd4\u8f03\u6f14\u7b97\u5b50\u300d\u306b\u3064\u3044\u3066\u57fa\u672c\u7684\u306a\u5b66\u7fd2\u304b\u3089\u59cb\u3081\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002\u300c\u6bd4\u8f03\u6f14\u7b97\u5b50\u300d\u306f\u3001IF\u6587\u3084for\u6587\u30fbwhile\u6587\u306a\u3069\u306e\u30eb\u30fc\u30d7\u51e6\u7406\u306e\u6761\u4ef6\u5f0f\u306b\u4f7f\u308f\u308c\u308b\u3053\u3068\u304c\u591a\u304f\u3066\u3001\u6587\u5b57\u901a\u308a<b>2\u3064\u306e\u5024\u3092\u6bd4\u8f03\u3059\u308b\u3053\u3068\u304c\u76ee\u7684\u306e\u6f14\u7b97\u5b50<\/b>\u3067\u3059\u3002<\/p>\n<p>JavaScript\u306e\u6bd4\u8f03\u306b\u304a\u3044\u3066\u3001\u4e00\u822c\u7684\u306b\u5229\u7528\u3055\u308c\u3066\u3044\u308b\u6f14\u7b97\u5b50\u306e\u4e00\u89a7\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\uff01<\/p>\n<table>\n<tbody>\n<tr>\n<th>\u6bd4\u8f03\u6f14\u7b97\u5b50<\/th>\n<th>\u610f\u5473<\/th>\n<th>\u4f7f\u7528\u4f8b<\/th>\n<th>\u7d50\u679c<\/th>\n<\/tr>\n<tr>\n<td>&gt;<\/td>\n<td>\u5de6\u8fba\u304c\u53f3\u8fba\u3088\u308a\u3082\u5927\u304d\u3044<\/td>\n<td>8 &gt; 2<\/td>\n<td>true<\/td>\n<\/tr>\n<tr>\n<td>&gt;=<\/td>\n<td>\u5de6\u8fba\u304c\u53f3\u8fba\u3088\u308a\u5927\u304d\u3044\u304b\u540c\u3058<\/td>\n<td>3 &gt;= 3<\/td>\n<td>true<\/td>\n<\/tr>\n<tr>\n<td>&lt;<\/td>\n<td>\u5de6\u8fba\u3088\u308a\u53f3\u8fba\u304c\u5927\u304d\u3044<\/td>\n<td>7 &gt; 4<\/td>\n<td>false<\/td>\n<\/tr>\n<tr>\n<td>&lt;=<\/td>\n<td>\u5de6\u8fba\u3088\u308a\u53f3\u8fba\u304c\u5927\u304d\u3044\u304b\u540c\u3058<\/td>\n<td>3 &lt;= 6<\/td>\n<td>true<\/td>\n<\/tr>\n<tr>\n<td>==<\/td>\n<td>\u5de6\u8fba\u3068\u53f3\u8fba\u306e\u5024\u304c\u540c\u3058<\/td>\n<td>&#8216;7&#8217; &gt; 7<\/td>\n<td>true<\/td>\n<\/tr>\n<tr>\n<td>===<\/td>\n<td>\u5de6\u8fba\u3068\u53f3\u8fba\u306e\u5024\u3068\u578b\u304c\u304a\u306a\u3058<\/td>\n<td>&#8216;7&#8217; === 7<\/td>\n<td>false<\/td>\n<\/tr>\n<tr>\n<td>!==(!=)<\/td>\n<td>\u5de6\u8fba\u3068\u53f3\u8fba\u304c\u7570\u306a\u308b<\/td>\n<td>&#8216;7&#8217; !== 7<\/td>\n<td>false<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6bd4\u8f03\u6f14\u7b97\u5b50\u306f\u30012\u3064\u306e\u5024\u3092\u6bd4\u8f03\u3057\u3066\u6b63\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u300cTrue \/ False\u300d\u3067\u8fd4\u3057\u3066\u304f\u308c\u308b\u306e\u304c\u7279\u5fb4\u3067\u3059\u3002<\/p>\n<p>\u300c&gt;\u300d\u3084\u300c&lt;\u300d\u306b\u3064\u3044\u3066\u306f\u3001\u5de6\u8fba\u3068\u53f3\u8fba\u306e\u5024\u304c\u5927\u304d\u3044\u304b\u5c0f\u3055\u3044\u304b\u3092\u6bd4\u8f03\u3059\u308b\u6642\u306b\u4f7f\u308f\u308c\u3001\u300c==\u300d\u3084\u300c===\u300d\u306b\u3064\u3044\u3066\u306f\u4e21\u65b9\u306e\u5024\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u6bd4\u8f03\u3057\u307e\u3059\u3002\uff08==\u3068===\u306e\u9055\u3044\u306b\u3064\u3044\u3066\u306f\u5f8c\u8ff0\u3057\u307e\u3059\uff09\u3053\u306e\u3088\u3046\u306a\u7406\u7531\u304b\u3089\u3001\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u6761\u4ef6\u5f0f\u306b\u300c\u6bd4\u8f03\u6f14\u7b97\u5b50\u300d\u306f\u3088\u304f\u4f7f\u308f\u308c\u308b\u3068\u3044\u3046\u308f\u3051\u3067\u3059\u306d\u3002<\/p>\n<h2>\u6bd4\u8f03\u6f14\u7b97\u5b50\u306e\u4f7f\u3044\u65b9<\/h2>\n<h3>\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/h3>\n<p>\u305d\u308c\u3067\u306f\u3001\u6bd4\u8f03\u6f14\u7b97\u5b50\u306e\u7a2e\u985e\u304c\u5206\u304b\u3063\u305f\u3068\u3053\u308d\u3067\u3001\u7c21\u5358\u306a\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u5b66\u3093\u3067\u3044\u304d\u307e\u3057\u3087\u3046\u3002\u4f8b\u3048\u3070\u3001\u5de6\u8fba\u304c\u53f3\u8fba\u3088\u308a\u5927\u304d\u3044\u72b6\u614b\u3092\u8868\u3059\u300c &gt; \u300d\u3092\u4f7f\u3063\u305fIF\u6587\u306e\u30b3\u30fc\u30c9\u4f8b\u3092\u898b\u3066\u307f\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true \">if(\u3010\u50241\u3011&gt;\u3010\u50242\u3011) {\r\n    \/\/\u50241\u304c\u5927\u304d\u3044\u5834\u5408\u306e\u51e6\u7406\uff08true\u306e\u51e6\u7406\uff09\r\n}\r\nelse {\r\n    \/\/\u50241\u304c\u5927\u304d\u304f\u306a\u3044\u5834\u5408\u306e\u51e6\u7406\uff08false\u306e\u51e6\u7406\uff09\r\n}<\/pre>\n<p>\u3053\u306e\u4f8b\u306e\u5834\u5408\u3001\u6761\u4ef6\u5f0f\u306b\u300c &gt; \u300d\u3092\u4f7f\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u300c\u50241\u300d\u304c\u300c\u50242\u300d\u3088\u308a\u3082\u5927\u304d\u3044\u5834\u5408\u306b\u300ctrue\u300d\u3068\u306a\u308a\u307e\u3059<b>\u30022\u3064\u306e\u5024\u3092\u6bd4\u8f03\u3059\u308b\u3053\u3068\u3067\u300ctrue \/ false\u300d\u306e\u7d50\u679c\u3092\u53d6\u5f97\u3067\u304d\u308b<\/b>\u306e\u3067\u3001\u6761\u4ef6\u5f0f\u304c\u5fc5\u8981\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u6bd4\u8f03\u6f14\u7b97\u5b50\u306f\u6b20\u304b\u305b\u306a\u3044\u5b58\u5728\u3068\u306a\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n<p>\u3061\u306a\u307f\u306b\u3001IF\u6587\u306b\u3064\u3044\u3066\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3084\u6d3b\u7528\u30d7\u30ed\u30b0\u30e9\u30e0\u4f8b\u3001\u4ed6\u306e\u6bd4\u8f03\u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u305f\u4e8b\u4f8b\u306a\u3069\u3092\u6b21\u306e\u8a18\u4e8b\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u308b\u306e\u3067\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/20736\" 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=\"\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">JavaScript\u3067IF\u6587\u306e\u4f7f\u3044\u65b9\u304b\u3089if&#8230;else if\u306e\u6d3b\u7528\u8853\u307e\u3067\u3092\u5fb9\u5e95\u89e3\u8aac<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n<h3>\u6570\u5024\u306e\u6bd4\u8f03<\/h3>\n<p>\u305d\u308c\u3067\u306f\u3001\u6bd4\u8f03\u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u305f\u5177\u4f53\u7684\u306a\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3092\u5b66\u3093\u3067\u3044\u304d\u307e\u3057\u3087\u3046\uff01\u307e\u305a\u306f\u3001\u300c\u6570\u5024\u300d\u3092\u6bd4\u8f03\u3057\u305f\u57fa\u672c\u7684\u306a\u4f8b\u3067\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true \">var result1 = 10 &lt; 20;\r\nvar result2 = 7 === 8;\r\nvar result3 = 3 &gt;= 3;\r\n\r\nconsole.log( '10 &lt; 20 \u2192 ' + result1 );\r\nconsole.log( '7 === 8 \u2192 ' + result2 );\r\nconsole.log( '3 &gt;= 3 \u2192 ' + result3 );<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">10 &lt; 20 \u2192 true\r\n7 === 8 \u2192 false\r\n3 &gt;= 3 \u2192 true<\/pre>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u306eresult1\u306f\u3001\u300c10 &lt; 20\u300d\u3092\u6bd4\u8f03\u3057\u3066\u304a\u308a\u5de6\u8fba\u304c\u5c0f\u3055\u3044\u5024\u306a\u306e\u3067\u300ctrue\u300d\u306b\u306a\u308a\u307e\u3059\u3002result2\u306f\u3001\u300c7 === 8\u300d\u3092\u6bd4\u8f03\u3057\u3066\u3044\u307e\u3059\u304c\u3069\u3061\u3089\u3082\u540c\u3058\u5024\u3067\u306f\u306a\u3044\u306e\u3067\u300cfalse\u300d\u3067\u3059\u306d\u3002<\/p>\n<p>\u305d\u3057\u3066\u3001result3\u306f\u5c11\u3057\u9593\u9055\u3044\u3084\u3059\u3044\u306e\u3067\u3059\u304c\u3001\u300c&gt;\u300d\u3067\u306f\u306a\u304f\u300c&gt;=\u300d\u3092\u4f7f\u3063\u3066\u6bd4\u8f03\u3057\u3066\u3044\u308b\u306e\u3067\u5de6\u8fba\u304c\u5927\u304d\u3044\u304b\u4e21\u65b9\u304c\u7b49\u3057\u3051\u308c\u3070\u300ctrue\u300d\u306b\u306a\u308b\u3068\u3044\u3046\u70b9\u306b\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002\u3053\u306e\u3088\u3046\u306b\u300ctrue \/ false\u300d\u3092\u7d50\u679c\u3068\u3057\u3066\u5f97\u3089\u308c\u308b\u306e\u3067\u3001\u6b21\u306e\u3088\u3046\u306b\u300cIF\u6587\u300d\u3078\u7d44\u307f\u8fbc\u3080\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff01<\/p>\n<pre class=\"lang:js decode:true \">var height = 180;\r\n\r\nif( height &gt; 170 ) {\r\n\r\n    console.log( '\u8eab\u9577\u304c\u9ad8\u3044\u3067\u3059' );\r\n\r\n}\r\nelse {\r\n\r\n    console.log( '\u666e\u901a\u306e\u8eab\u9577\u3067\u3059' );\r\n\r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">\u8eab\u9577\u304c\u9ad8\u3044\u3067\u3059<\/pre>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u306f\u3001\u5909\u6570\u300cheight\u300d\u306e\u5024\u304c170\u3088\u308a\u3082\u5927\u304d\u3044\u5024\u306a\u306e\u3067\u3001\u7d50\u679c\u7684\u306b\u300ctrue\u300d\u3068\u5224\u65ad\u3055\u308c\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u6761\u4ef6\u5206\u5c90\u306f\u3001\u4ed6\u306b\u3082\u300cfor\u6587\u300d\u300cswitch\u6587\u300d\u300cWhile\u6587\u300d\u306a\u3069\u306b\u3082\u6709\u52b9\u6d3b\u7528\u3067\u304d\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n<h3>\u6587\u5b57\u5217\u306e\u6bd4\u8f03<\/h3>\n<p>\u6b21\u306b\u3001\u300c\u6587\u5b57\u5217\u300d\u3092\u6bd4\u8f03\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01\u57fa\u672c\u7684\u306a\u8003\u3048\u65b9\u306f\u300c\u6570\u5024\u300d\u3092\u6bd4\u8f03\u3057\u305f\u6642\u3068\u540c\u3058\u3067\u3059\u304c\u3001\u300c\u6587\u5b57\u5217\u300d\u3060\u3051\u306e\u7279\u5fb4\u3082\u5b58\u5728\u3059\u308b\u306e\u3067\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:js decode:true \">var result1 = '\u3042' &lt; '\u3046';\r\nvar result2 = '\uff17' === '\uff18';\r\nvar result3 = '\u592a\u90ce' &gt;= '\u592a\u90ce';\r\n\r\nconsole.log( '\u3042 &lt; \u3046 \u2192 ' + result1 );\r\nconsole.log( '\uff17 === \uff18 \u2192 ' + result2 );\r\nconsole.log( 'Hello &gt;= Hello \u2192 ' + result3 );<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">\u3042 &lt; \u3046 \u2192 true\r\n\uff17 === \uff18 \u2192 false\r\nHello &gt;= Hello \u2192 true<\/pre>\n<p>result1\u306f\u300c\u3042 &lt; \u3046\u300d\u3092\u6bd4\u8f03\u3057\u3066\u3044\u308b\u306e\u3067\u3059\u304c\u3001\u6570\u5b57\u306e\u300c1234\u2026\u300d\u307f\u305f\u3044\u306b\u6587\u5b57\u3082\u300c\u3042\u3044\u3046\u3048\u2026\u300d\u306e\u3088\u3046\u306b\u9806\u756a\u306b\u6570\u3048\u3066\u3044\u304d\u307e\u3059\u3088\u306d\uff1f\u3053\u306e\u3088\u3046\u306a\u6642\u306b\u3001\u6700\u521d\u306b\u6570\u3048\u305f\u6587\u5b57\u306f\u3042\u3068\u3067\u6570\u3048\u305f\u6587\u5b57\u3088\u308a\u3082\u300c\u5c0f\u3055\u306a\u5024\u300d\u306b\u306a\u308b\u306e\u3067\u3001\u300c\u3042 &lt; \u3046\u300d\u3092\u6bd4\u8f03\u3059\u308b\u3068\u300c\u3042\u300d\u306e\u307b\u3046\u304c\u5c0f\u3055\u306a\u5024\u306b\u306a\u308b\u306e\u3067\u300ctrue\u300d\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>result2\u306f\u6587\u5b57\u5217\u306e\u6570\u5b57\u300c\uff17 === \uff18\u300d\u3092\u6bd4\u8f03\u3057\u3066\u3044\u308b\u306e\u3067\u3059\u304c\u3001\u3053\u308c\u306f\u6570\u5024\u3092\u6bd4\u8f03\u3057\u305f\u6642\u3068\u540c\u3058\u7d50\u679c\u3068\u306a\u308a\u300cfalse\u300d\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>result3\u306f\u30a2\u30eb\u30d5\u30a1\u30d9\u30c3\u30c8\u306e\u6587\u5b57\u5217\u3092\u4f7f\u3063\u3066\u300cHello &gt;= Hello\u300d\u3092\u6bd4\u8f03\u3057\u3066\u304a\u308a\u3001\u4e21\u65b9\u304c\u540c\u3058\u6587\u5b57\u5217\u306a\u306e\u3067\u7d50\u679c\u7684\u306b\u300ctrue\u300d\u306b\u306a\u308b\u308f\u3051\u3067\u3059\u306d\u3002<\/p>\n<h3>Boolean\u306e\u6bd4\u8f03<\/h3>\n<p>\u4eca\u5ea6\u306f\u300cBoolean\uff08\u771f\u507d\u5024\uff09\u300d\u306e\u300ctrue \/ false\u300d\u3092\u6bd4\u8f03\u3057\u3066\u307f\u307e\u3059\uff01\u6bd4\u8f03\u6f14\u7b97\u5b50\u306e\u7d50\u679c\u3092\u300ctrue \/ false\u300d\u3067\u53d6\u5f97\u3067\u304d\u308b\u308f\u3051\u3067\u3059\u304c\u3001\u305d\u308c\u81ea\u4f53\u3092\u6bd4\u8f03\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u308b\u306e\u3067\u77e5\u3063\u3066\u304a\u304f\u3068\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u6b21\u306e\u30b3\u30fc\u30c9\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n<pre class=\"lang:js decode:true \">var result1 = true === false;\r\nvar result2 = true &lt; false;\r\nvar result3 = true !== false;\r\n\r\nconsole.log( 'true === false \u2192 ' + result1 );\r\nconsole.log( 'true &lt; false \u2192 ' + result2 );\r\nconsole.log( 'true !== false \u2192 ' + result3 );<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">true === false \u2192 false\r\ntrue &lt; false \u2192 false\r\ntrue !== false \u2192 true<\/pre>\n<p>result1\u306f\u300ctrue === false\u300d\u3092\u6bd4\u8f03\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u5f53\u7136\u306a\u304c\u3089\u3069\u3061\u3089\u3082\u9055\u3046\u5024\u3067\u3059\u306e\u3067\u7d50\u679c\u306f\u300cfalse\u300d\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>result2\u306f\u300ctrue &lt; false\u300d\u3092\u6bd4\u8f03\u3057\u3066\u3044\u308b\u306e\u3067\u3059\u304c\u3001\u5024\u306e\u5927\u304d\u3055\u3068\u3057\u3066\u306f\u300ctrue\u300d\u306e\u65b9\u304c\u5927\u304d\u3044\u306e\u3067\u300cfalse\u300d\u306b\u306a\u308b\u3068\u3044\u3046\u70b9\u306f\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>result3\u306e\u300ctrue !== false\u300d\u306f\u3001\u5426\u5b9a\uff08!==\uff09\u306e\u6bd4\u8f03\u306a\u306e\u3067\u7570\u306a\u308b\u5024\u304c\u6bd4\u8f03\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u300ctrue\u300d\u306b\u306a\u308b\u308f\u3051\u3067\u3059\u3002\u300cBoolean\u300d\u306e\u6bd4\u8f03\u306f\u3001\u5f8c\u8ff0\u3059\u308b\u3088\u3046\u306b<b>\u8907\u6570\u306e\u6761\u4ef6\u5f0f\u3092\u6bd4\u8f03\u3059\u308b\u969b\u306b\u5fc5\u8981\u306a\u77e5\u8b58<\/b>\u3068\u306a\u3063\u3066\u304f\u308b\u306e\u3067\u3001\u7e70\u308a\u8fd4\u3057\u7df4\u7fd2\u3057\u306a\u304c\u3089\u610f\u5473\u3092\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u306b\u9811\u5f35\u308a\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2>\u300c==\u300d\u3068\u300c=== (\u30a4\u30b3\u30fc\u30eb3\u3064)\u300d\u306e\u9055\u3044<\/h2>\n<p>\u5192\u982d\u3067\u3054\u7d39\u4ecb\u3057\u305f\u6bd4\u8f03\u6f14\u7b97\u5b50\u306e\u4e00\u89a7\u3067\u3001\u4e21\u65b9\u306e\u300c\u5024\u300d\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u306e\u306b\u300c==\u300d\u3068\u300c===\u300d\u304c\u4f7f\u308f\u308c\u308b\u3068\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u3068\u3053\u308d\u3067\u3001\u3053\u306e2\u3064\u306f\u4e00\u4f53\u4f55\u304c\u9055\u3046\u306e\u3067\u3057\u3087\u3046\u304b\uff1f\u5b9f\u306f\u3001\u305d\u308c\u305e\u308c\u7570\u306a\u308b\u540d\u79f0\u3092\u6301\u3063\u3066\u304a\u308a\u3001\u4e00\u822c\u7684\u306b\u300c==\uff08\u7b49\u4fa1\u6f14\u7b97\u5b50\uff09\u300d\u300c===\uff08\u53b3\u5bc6\u7b49\u4fa1\u6f14\u7b97\u5b50\uff09\u300d\u3068\u547c\u3070\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e2\u3064\u306e\u30dd\u30a4\u30f3\u30c8\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff01<br \/>\n<div class=\"box01\"><\/p>\n<ul>\n<li><b>\u300c== (\u7b49\u4fa1\u6f14\u7b97\u5b50)\u300d\uff1a\u6bd4\u8f03\u3059\u308b\u969b\u306b\u300c\u5024\u300d\u3060\u3051\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u6f14\u7b97\u5b50<\/b><\/li>\n<li><b>\u300c=== (\u53b3\u5bc6\u7b49\u4fa1\u6f14\u7b97\u5b50)\u300d\uff1a\u6bd4\u8f03\u3059\u308b\u969b\u306b\u300c\u5024\u300d\u3068\u300c\u578b\u300d\u306e\u4e21\u65b9\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u6f14\u7b97\u5b50<\/b><\/li>\n<\/ul>\n<\/div>\n<p>\u4e0a\u8a18\u306e\u9055\u3044\u3092\u3001\u5177\u4f53\u7684\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u898b\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n<pre class=\"lang:js decode:true \">var str = '10'; \/\/\u6587\u5b57\u5217\u306e10\r\nvar num = 10; \/\/\u6570\u5024\u306e10\r\n\r\n\/\/==\u3068===\u306e\u9055\u3044\u3092\u78ba\u8a8d\u3059\u308b\r\nvar result1 = str == num;\r\nvar result2 = str === num;\r\n\r\nconsole.log('\u300c== (\u7b49\u4fa1\u6f14\u7b97\u5b50)\u300d\uff1a' + result1);\r\nconsole.log('\u300c=== (\u53b3\u5bc6\u7b49\u4fa1\u6f14\u7b97\u5b50)\u300d\uff1a' + result2);<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">\u300c== (\u7b49\u4fa1\u6f14\u7b97\u5b50)\u300d\uff1atrue\r\n\u300c=== (\u53b3\u5bc6\u7b49\u4fa1\u6f14\u7b97\u5b50)\u300d\uff1afalse<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u6587\u5b57\u5217\u306e\u300c10\u300d\u3068\u6570\u5024\u306e\u300c10\u300d\u3092\u6bd4\u8f03\u3057\u305f\u4f8b\u306b\u306a\u308a\u307e\u3059\u3002\u5024\u306f\u3069\u3061\u3089\u3082\u300c10\u300d\u3067\u540c\u3058\u306a\u306e\u3067\u3059\u304c\u3001\u578b\u304c\u300c\u6587\u5b57\u5217\u578b\u300d\u3068\u300c\u6570\u5024\u578b\u300d\u3067\u7570\u306a\u308b\u305f\u3081\u306b\u7d50\u679c\u304c\u5909\u308f\u3063\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\u5b9f\u884c\u7d50\u679c\u3092\u898b\u308b\u3068\u3001\u300c==\u300d\u306f\u578b\u3092\u8003\u616e\u3057\u306a\u3044\u306e\u3067\u300ctrue\u300d\u3068\u306a\u308a\u3001\u300c===\u300d\u306f\u578b\u3092\u8003\u616e\u3057\u3066\u6bd4\u8f03\u3059\u308b\u305f\u3081\u300cfalse\u300d\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u306d\u3002\u3053\u306e2\u7a2e\u985e\u306e\u9055\u3044\u306f\u3001\u6b21\u306e\u3088\u3046\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u9593\u9055\u3044\u304c\u8d77\u304d\u3084\u3059\u3044\u306e\u3067\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n<pre class=\"lang:js decode:true \">var v1 = '\u3042\u3044\u3046\u3048\u304a';\r\nvar v2 = new String('\u3042\u3044\u3046\u3048\u304a');\r\n\r\nvar r1 = v1 == v2;\r\nvar r2 = v1 === v2;\r\n\r\nconsole.log('\u300c== (\u7b49\u4fa1\u6f14\u7b97\u5b50)\u300d\uff1a' + r1);\r\nconsole.log('\u300c=== (\u53b3\u5bc6\u7b49\u4fa1\u6f14\u7b97\u5b50)\u300d\uff1a' + r2);<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">\u300c== (\u7b49\u4fa1\u6f14\u7b97\u5b50)\u300d\uff1atrue\r\n\u300c=== (\u53b3\u5bc6\u7b49\u4fa1\u6f14\u7b97\u5b50)\u300d\uff1afalse<\/pre>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u306f\u3001\u300c\u3042\u3044\u3046\u3048\u304a\u300d\u3068\u3044\u3046\u6587\u5b57\u5217\u3092\u4f5c\u6210\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u3059\u304c\u3001\u5909\u6570\u300cv1\u300d\u306f\u6587\u5b57\u3092\u76f4\u63a5\u4ee3\u5165\u3057\u3066\u3044\u308b\u306e\u306b\u5bfe\u3057\u3066\u3001\u5909\u6570\u300cv2\u300d\u306fString\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3069\u3061\u3089\u3082\u540c\u3058\u6587\u5b57\u5217\u3092\u4f5c\u6210\u3057\u3066\u3044\u308b\u306f\u305a\u306a\u306e\u3067\u3059\u304c\u3001\u7d50\u679c\u3092\u898b\u308b\u3068\u300c===\u300d\u3067\u6bd4\u8f03\u3059\u308b\u3068\u540c\u3058\u3067\u306f\u306a\u3044\u3068\u3044\u3046\u5224\u65ad\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u306d\u3002\u305d\u3053\u3067\u3001\u4e21\u65b9\u306e\u6587\u5b57\u5217\u306e\u6b63\u4f53\u3092\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n<pre class=\"lang:js decode:true \">var v1 = '\u3042\u3044\u3046\u3048\u304a';\r\nvar v2 = new String('\u3042\u3044\u3046\u3048\u304a');\r\n\r\nconsole.log( typeof v1 );\r\nconsole.log( typeof v2 );<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">string\r\nobject<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u300ctypeof\u300d\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u3001\u305d\u308c\u305e\u308c\u306e\u5909\u6570\u306e\u300c\u578b\u300d\u3092\u8abf\u3079\u3066\u3044\u307e\u3059\u3002\u3059\u308b\u3068\u3001String\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u4f5c\u6210\u3057\u305f\u6587\u5b57\u5217\u306f\u3001<b>\u300cString\u578b\u300d\u3067\u306f\u306a\u304f\u300c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8(Object)\u578b\u300d\u3067\u3042\u3063\u305f\u3053\u3068\u304c\u5224\u660e<\/b>\u3059\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n<p>\u305d\u306e\u305f\u3081\u3001\u5024\u3068\u578b\u3092\u8003\u616e\u3059\u308b\u300c===\u300d\u3092\u4f7f\u3063\u305f\u6bd4\u8f03\u3067\u306f\u3001\u7d50\u679c\u7684\u306b\u300cfalse\u300d\u304c\u51fa\u529b\u3055\u308c\u305f\u3068\u3044\u3046\u308f\u3051\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\u30012\u3064\u306e\u5024\u304c\u540c\u3058\u304b\u3069\u3046\u304b\u3092\u6bd4<b>\u8f03\u3059\u308b\u969b\u306b\u306f\u3001\u300c\u5024\u300d\u3060\u3051\u3067\u306a\u304f\u300c\u578b\u300d\u306e\u5b58\u5728\u3082\u3042\u308b<\/b>\u3053\u3068\u3092\u5fd8\u308c\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\uff01<\/p>\n<h2>\u8907\u6570\u306e\u6761\u4ef6\u3092\u6bd4\u8f03\u3057\u3088\u3046\uff01<\/h2>\n<p>\u6bd4\u8f03\u6f14\u7b97\u5b50\u306f\u3001\u5358\u4f53\u3067\u4f7f\u7528\u3059\u308b\u3060\u3051\u3067\u306a\u304f\u8907\u6570\u306e\u6761\u4ef6\u5f0f\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u6bd4\u8f03\u3059\u308b\u30b1\u30fc\u30b9\u3082\u591a\u3044\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001\u6b21\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u898b\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"lang:js decode:true \">var result1 = 10 &lt; 20;\r\nvar result2 = 'Hello' === 'World';\r\n\r\nconsole.log( result1 );\r\nconsole.log( result2 );<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">true\r\nfalse<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u300cresult1\u300d\u300cresult2\u300d\u3078\u5358\u7d14\u306a\u6bd4\u8f03\u306e\u6761\u4ef6\u5f0f\u3092\u4ee3\u5165\u3057\u3066\u3044\u307e\u3059\u3002\u5b9f\u884c\u7d50\u679c\u306f\u300cresult2\u300d\u304cfalse\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u304c\u3001\u4f8b\u3048\u3070\u3069\u3061\u3089\u304b1\u3064\u3067\u3082true\u3067\u3042\u308c\u3070\u5f37\u5236\u7684\u306b\u300ctrue\u306e\u51e6\u7406\u300d\u3092\u5b9f\u884c\u3057\u305f\u3044\u6642\u306f\u3069\u306e\u3088\u3046\u306b\u3059\u308c\u3070\u826f\u3044\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n<p>\u305d\u3093\u306a\u6642\u306b\u5229\u7528\u3057\u305f\u3044\u306e\u304c\u3001\u6b21\u306e\u9805\u76ee\u3067\u7d39\u4ecb\u3059\u308b\u300c\u8ad6\u7406\u6f14\u7b97\u5b50\u300d\u3067\u3059\uff01<\/p>\n<h3>OR( || )\u306b\u3064\u3044\u3066<\/h3>\n<p>\u300c\u8ad6\u7406\u6f14\u7b97\u5b50\u300d\u3068\u805e\u304f\u3068\u306a\u3093\u3060\u304b\u96e3\u3057\u305d\u3046\u3067\u3059\u304c\u3001\u3053\u3053\u3067\u899a\u3048\u308b\u306e\u306f\u300cOR( || )\u300d\u3068\u300cAND( &amp;&amp; )\u300d\u306e2\u3064\u3060\u3051\u3067\u3059\u3002<\/p>\n<p>\u307e\u305a\u6700\u521d\u306b\u3001\u300cOR( || )\u300d\u306e\u4f7f\u3044\u65b9\u304b\u3089\u5b66\u7fd2\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01\u300cOR( || )\u300d\u306f\u3001\u6587\u5b57\u901a\u308a\u3069\u3061\u3089\u304b\u306e\u5024\u304ctrue\u3067\u3042\u308c\u3070\u7d50\u679c\u7684\u306b\u300ctrue\u300d\u3092\u8fd4\u3057\u3066\u304f\u308c\u308b\u6f14\u7b97\u5b50\u306b\u306a\u308a\u307e\u3059\u3002\u5148\u307b\u3069\u4f7f\u3063\u305f\u30b3\u30fc\u30c9\u4f8b\u3092\u3082\u3046\u4e00\u5ea6\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:js decode:true \">var result1 = 10 &lt; 20;\r\nvar result2 = 'Hello' === 'World';\r\n\r\nconsole.log( result1 );\r\nconsole.log( result2 );<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">true\r\nfalse<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u300cresult1\u300d\u304ctrue\u3067\u300cresult2\u300d\u304cfalse\u306a\u306e\u3067\u3059\u304c\u3001\u3053\u308c\u3092\u300cOR( || )\u300d\u3067\u66f8\u304d\u63db\u3048\u308b\u3068\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true \">var result = 10 &lt; 20 || 'Hello' === 'World';\r\n\r\nconsole.log( result );<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">true<\/pre>\n<p>2\u3064\u3042\u3063\u305f\u6761\u4ef6\u5f0f\u30921\u884c\u3067\u66f8\u3051\u308b\u3088\u3046\u306b\u306a\u308a\u3001\u5b9f\u884c\u7d50\u679c\u3082true\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u306d\u3002\u7570\u306a\u308b\u6761\u4ef6\u5f0f\u306e\u9593\u306b\u300c || \u300d\u3092\u633f\u5165\u3059\u308b\u3053\u3068\u3067\u300cOR\u300d\u3092\u4f7f\u3048\u308b\u306e\u3067\u3059\u304c\u3001\u3053\u306e\u6761\u4ef6\u5f0f\u306f\u8aad\u307f\u66ff\u3048\u308b\u3068\u300cresult = true || false\u300d\u3068\u3044\u3046\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3088\u306d\u3002<\/p>\n<p>\u3064\u307e\u308a\u3001\u300cOR( || )\u300d\u306f<b>2\u3064\u306e\u6761\u4ef6\u5f0f\u304c\u3069\u3061\u3089\u3082\u300cfalse\u300d\u3067\u306a\u3044\u9650\u308a\u300ctrue\u300d\u3092\u8fd4\u3057\u3066\u304f\u308c\u308b<\/b>\u3068\u3044\u3046\u70b9\u3092\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\uff01OR\u306e\u8a73\u3057\u3044\u4f7f\u3044\u65b9\u306f\u3053\u3061\u3089\u306e\u8a18\u4e8b\u3067\u89e3\u8aac\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u305c\u3072\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/61639\" 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\/2018\/06\/image43-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010JavaScript\u5165\u9580\u3011\u3059\u3050\u308f\u304b\u308b\uff01or\u6f14\u7b97\u5b50\u306e\u4f7f\u3044\u65b9<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n<h3>AND( &amp;&amp; )\u306b\u3064\u3044\u3066<\/h3>\n<p>\u6b21\u306b\u3001\u300cAND( &amp;&amp; )\u300d\u306b\u3064\u3044\u3066\u5b66\u7fd2\u3057\u307e\u3057\u3087\u3046\uff01\u3068\u2026\u3001\u8a00\u3063\u3066\u3082\u5b9f\u306f\u7c21\u5358\u3067\u3001\u5148\u307b\u3069\u306e\u300cOR( || )\u300d\u6f14\u7b97\u5b50\u306e\u53cd\u5bfe\u304c\u300cAND( &amp;&amp; )\u300d\u306b\u306a\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n<p>\u300cOR( || )\u300d\u306f\u4e21\u65b9\u306e\u6761\u4ef6\u5f0f\u304c\u300cfalse\u300d\u306e\u5834\u5408\u306e\u307f\u300cfalse\u300d\u3092\u8fd4\u3059\u306e\u3067\u3059\u304c\u3001\u300cAND( &amp;&amp; )\u300d\u306f\u4e21\u65b9\u306e\u6761\u4ef6\u5f0f\u304c\u300ctrue\u300d\u306e\u5834\u5408\u306e\u307f\u300ctrue\u300d\u3092\u8fd4\u3059\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u5b9f\u969b\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n<pre class=\"lang:js decode:true \">var result = 10 &lt; 20 &amp;&amp; 'Hello' === 'Wrold';\r\n\r\nconsole.log( result );<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">false<\/pre>\n<p>\u3053\u306e\u4f8b\u306f\u3001\u5148\u307b\u3069\u300cOR\u300d\u306e\u6642\u306b\u300ctrue\u300d\u3068\u306a\u3063\u305f\u30b3\u30fc\u30c9\u3067\u3059\u304c\u3001\u300cAND\u300d\u306e\u5834\u5408\u3060\u3068\u300cfalse\u300d\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\u7570\u306a\u308b\u6761\u4ef6\u5f0f\u306e\u9593\u306b\u300c &amp;&amp; \u300d\u3092\u633f\u5165\u3059\u308b\u3053\u3068\u3067\u300cAND\u300d\u304c\u4f7f\u3048\u308b\u306e\u3067\u3059\u304c\u3001\u3053\u306e\u4f8b\u3092\u8aad\u307f\u66ff\u3048\u308b\u3068\u300cresult = true &amp;&amp; false\u300d\u306b\u306a\u308b\u305f\u3081\u6700\u7d42\u7684\u306bfalse\u6271\u3044\u306b\u306a\u308a\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u300cAND\u300d\u306f<b>2\u3064\u306e\u6761\u4ef6\u5f0f\u304c\u3069\u3061\u3089\u3082\u300ctrue\u300d\u3067\u306a\u3044\u9650\u308a\u300cfalse\u300d\u3092\u8fd4\u3059<\/b>\u3068\u3044\u3046\u70b9\u3092\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n<h2>null\u3068undefined\u306e\u6bd4\u8f03\u306b\u3064\u3044\u3066<\/h2>\n<p>JavaScript\u306b\u306f\u3001\u300cnull\u300d\u3068\u300cundefined\u300d\u3068\u3044\u3046\u7279\u6b8a\u306a\u5024\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u7c21\u5358\u306b\u89e3\u8aac\u3059\u308b\u3068\u3001<b>null\u306f\u300c\u7a7a\u3063\u307d\u306e\u72b6\u614b\u300d\u3092\u8868\u3059\u5024\u3067\u3001undefined\u306f\u300c\u672a\u5b9a\u7fa9\u306e\u72b6\u614b\u300d<\/b>\u3092\u610f\u5473\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u305d\u306e\u305f\u3081\u300cnull\u300d\u3068\u300cundefined\u300d\u306f\u610f\u5473\u5408\u3044\u304c\u9055\u3046\u308f\u3051\u3067\u3059\u304c\u3001\u4e21\u8005\u3092\u6bd4\u8f03\u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u3066\u6bd4\u3079\u3066\u307f\u308b\u3068\u3069\u3046\u306a\u308b\u3067\u3057\u3087\u3046\u304b\uff1f\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u898b\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n<pre class=\"lang:js decode:true \">var value1;         \/\/\u3053\u308c\u306fundefined\r\nvar value2 = null; \/\/\u3053\u308c\u306fnull\r\n\r\nconsole.log( value1 == value2 );\r\nconsole.log( value1 === value2 );<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">true\r\nfalse<\/pre>\n<p>\u300cvalue1\u300d\u306f\u5b9a\u7fa9\u3055\u308c\u305f\u3060\u3051\u3067\u4e2d\u8eab\u304c\u7121\u3044\u306e\u3067\u300cundefined\u300d\u306b\u306a\u308a\u3001\u300cvalue2\u300d\u306f\u4e2d\u8eab\u304c\u7121\u3044\u3053\u3068\u3092\u660e\u78ba\u306b\u3059\u308b\u305f\u3081\u300cnull\u300d\u304c\u4ee3\u5165\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u5b9f\u884c\u7d50\u679c\u3092\u898b\u308b\u3068\u3001\u7b49\u4fa1\u6f14\u7b97\u5b50\uff08==\uff09\u306f\u4e21\u65b9\u540c\u3058\u5024\u3068\u5224\u65ad\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u53b3\u5bc6\u7b49\u4fa1\u6f14\u7b97\u5b50\uff08===\uff09\u3067\u6bd4\u8f03\u3059\u308b\u3068\u7570\u306a\u308b\u5024\u3067\u3042\u308b\u3068\u5224\u65ad\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306f\u3001<b>\u300cnull\u300d\u304c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u578b\u3067\u3042\u308a\u300cundefined\u300d\u3068\u300c\u578b\u300d<\/b>\u304c\u7570\u306a\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u300cnull\u300d\u3068\u300cundefined\u300d\u306e\u95a2\u4fc2\u6027\u3084\u3001\u3088\u308a\u8a73\u3057\u3044\u6d3b\u7528\u65b9\u6cd5\u306a\u3069\u306f\u6b21\u306e\u8a18\u4e8b\u3067\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u3066\u3044\u308b\u306e\u3067\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/23762\" 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\/2018\/04\/javascript-null-re3-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010JavaScript\u5165\u9580\u3011null\u30fbundefined\u306e\u4ee3\u5165\u30fb\u5224\u5b9a\u30fb\u5909\u63db\u307e\u3068\u3081\uff01<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n<h2>\u6bd4\u8f03\u306e\u4f7f\u3044\u65b9\u7dcf\u307e\u3068\u3081<\/h2>\n<p>\u6587\u5b57\u5217\u306e\u6bd4\u8f03\u306b\u3064\u3044\u3066\u300c\u6587\u5b57\u3068\u6570\u5b57\u300d\u306e\u95a2\u4fc2\u6027\u3084\u300c\u5927\u6587\u5b57\u3068\u5c0f\u6587\u5b57\u300d\u306e\u6bd4\u8f03\u306b\u3064\u3044\u3066\u306a\u3069\u3001\u3055\u307e\u3056\u307e\u306a\u624b\u6cd5\u3092\u6b21\u306e\u8a18\u4e8b\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u308b\u306e\u3067\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/21413\" 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\/2018\/02\/javascript-string-compare-re2-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010JavaScript\u5165\u9580\u3011\u6587\u5b57\u5217\u3092\u300c\u6bd4\u8f03\u300d\u3059\u308b\u6f14\u7b97\u5b50\u306e\u4f7f\u3044\u65b9\u307e\u3068\u3081\uff01<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u4eca\u56de\u306f\u3001\u6bd4\u8f03\u6f14\u7b97\u5b50\u306b\u3064\u3044\u3066\u3055\u307e\u3056\u307e\u306a\u30b1\u30fc\u30b9\u3092\u5b66\u7fd2\u3057\u307e\u3057\u305f\uff01\u4eca\u56de\u306e\u30dd\u30a4\u30f3\u30c8\u3092\u6700\u5f8c\u306b\u3082\u3046\u4e00\u5ea6\u304a\u3055\u3089\u3044\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<br \/>\n<div class=\"box01\"><\/p>\n<li><b>\u6bd4\u8f03\u6f14\u7b97\u5b50\u306f\u30012\u3064\u306e\u5024\u3092\u6bd4\u8f03\u3057\u3066\u300ctrue \/ false\u300d\u3092\u8fd4\u3057\u3066\u304f\u308c\u308b<\/b><\/li>\n<li><b>\u6bd4\u8f03\u6f14\u7b97\u5b50\u306fIF\u6587\u306a\u3069\u306e\u6761\u4ef6\u5f0f\u3067\u4fbf\u5229\u306b\u6d3b\u7528\u3067\u304d\u308b<\/b><\/li>\n<li><b>==\u3068===\u306f\u300c\u578b\u300d\u3092\u8003\u616e\u3059\u308b\u304b\u3069\u3046\u304b\u3067\u7570\u306a\u308b<\/b><\/li>\n<li><b>\u6bd4\u8f03\u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u305f\u6761\u4ef6\u5f0f\u306f\u8907\u6570\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3082\u53ef\u80fd<\/b><\/li>\n<li><b>null\u3068undefined\u306f\u578b\u304c\u9055\u3046\u3053\u3068\u306b\u6ce8\u610f\u3059\u308b<\/b><\/li>\n<\/div>\n<p>\u3053\u308c\u3089\u306e\u5185\u5bb9\u3092\u8e0f\u307e\u3048\u3066\u3001\u305c\u3072\u81ea\u5206\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u3082\u53d6\u308a\u5165\u308c\u306a\u304c\u3089\u7a4d\u6975\u7684\u306b\u6d3b\u7528\u3057\u3066\u30b9\u30ad\u30eb\u30a2\u30c3\u30d7\u3092\u76ee\u6307\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n<p>JavaScript\u306b\u306f\u4ed6\u306b\u3082\u5229\u7528\u983b\u5ea6\u304c\u9ad8\u3044\u6f14\u7b97\u5b50\u304c\u591a\u304f\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u4ed6\u306e\u6f14\u7b97\u5b50\u306b\u3064\u3044\u3066\u77e5\u308a\u305f\u3044\u65b9\u306f\u4ee5\u4e0b\u306e\u8a18\u4e8b\u306b\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u306e\u3067\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u306d\u3002<\/p>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/22279\" 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\/2018\/08\/javascript-tutorial-top-150x86.png\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010javaScript\u5165\u9580\u3011\u8ab0\u3067\u3082\u5206\u304b\u308b\u6f14\u7b97\u5b50\u306e\u4f7f\u3044\u65b9\u3068\u7a2e\u985e\u306b\u3064\u3044\u3066<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n","protected":false},"excerpt":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\u3001\u30e9\u30a4\u30bf\u30fc\u306e\u30de\u30b5\u30c8\u3067\u3059\uff01 \u4eca\u56de\u306f\u30012\u3064\u306e\u5024\u3092\u6bd4\u8f03\u3057\u3066\u6761\u4ef6\u5206\u5c90\u306a\u3069\u3092\u884c\u3046\u51e6\u7406\u306b\u3088\u304f\u4f7f\u308f\u308c\u308b\u300c\u6bd4\u8f03\u6f14\u7b97\u5b50\u300d\u306b\u3064\u3044\u3066\u5b66\u7fd2\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01 \u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001 \u6bd4\u8f03\u6f14\u7b97\u5b50\u3068\u306f\uff1f \u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9 \u6570\u5024\u306e\u6bd4\u8f03 \u6587\u5b57\u5217\u306e\u6bd4\u8f03  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name=\"twitter:creator\" content=\"@https:\/\/twitter.com\/samuraijuku\" \/>\n<meta name=\"twitter:site\" content=\"@samuraijuku\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.sejuku.net\\\/blog\\\/23942#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.sejuku.net\\\/blog\\\/23942\"},\"author\":{\"name\":\"\u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u7de8\u96c6\u90e8\",\"@id\":\"https:\\\/\\\/www.sejuku.net\\\/blog\\\/#\\\/schema\\\/person\\\/e8ca7fd09857a736a25e6b4455a3ab61\"},\"headline\":\"\u3010JavaScript\u5165\u9580\u3011\u6bd4\u8f03\u6f14\u7b97\u5b50\u306e\u4f7f\u3044\u65b9\u307e\u3068\u3081 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