{"id":23627,"date":"2017-08-13T00:00:59","date_gmt":"2017-08-12T15:00:59","guid":{"rendered":"http:\/\/www.sejuku.net\/blog\/?p=23627"},"modified":"2024-05-06T11:42:35","modified_gmt":"2024-05-06T02:42:35","slug":"%e3%80%90javascript%e5%85%a5%e9%96%80%e3%80%91%e4%b8%89%e9%a0%85%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%8b%e3%82%b3%e3%83%84%e3%81%be%e3%81%a8%e3%82%81","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/23627","title":{"rendered":"\u3010JavaScript\u5165\u9580\u3011\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u306e\u4f7f\u3044\u65b9\u3068\u6d3b\u7528\u4f8b\u307e\u3068\u3081\uff01"},"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\u3001\u300cIF\u6587\u300d\u3092\u7c21\u7565\u7684\u304b\u3064\u52b9\u7387\u3088\u304f\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u308b<span style=\"color: #339966;\"><strong>\u300c\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u300d<\/strong><\/span>\u306b\u3064\u3044\u3066\u5b66\u7fd2\u3057\u307e\u3057\u3087\u3046\uff01<\/p>\n<p>\u300c\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u300d\u306b\u306f\u3001\u3055\u307e\u3056\u307e\u306a\u66f8\u304d\u65b9\u3084\u4f7f\u3044\u65b9\u306e\u30c6\u30af\u30cb\u30c3\u30af\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u672c\u8a18\u4e8b\u3092\u8aad\u3080\u3053\u3068\u3067\u521d\u5fc3\u8005\u306e\u65b9\u3067\u3082\u3059\u3050\u306b\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u306b\u89e3\u8aac\u3057\u307e\u3059\uff01<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001<\/p>\n<p><span style=\"color: #ff0000;\"><strong>\u30fb\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u3068\u306f\uff1f<br \/>\n\u30fb\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<br \/>\n\u30fb\u5f0f\u306f\u7701\u7565\u3067\u304d\u306a\u3044<br \/>\n\u30fbnull\u3084undefined\u306a\u3069\u306e\u5224\u5b9a\u306b\u3064\u3044\u3066<br \/>\n<\/strong><\/span><br \/>\n\u3068\u3044\u3046\u57fa\u672c\u7684\u306a\u5185\u5bb9\u304b\u3089\u3001<\/p>\n<p><span style=\"color: #ff0000;\"><strong>\u30fb\u5024\u3092return(\u623b\u308a\u5024)\u3059\u308b\u65b9\u6cd5<br \/>\n\u30fb\u51e6\u7406\u3092\u6539\u884c\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066<br \/>\n\u30fb\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u306e\u5fdc\u7528\u30c6\u30af\u30cb\u30c3\u30af<br \/>\n<\/strong><\/span><br \/>\n\u306a\u3069\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u3044\u65b9\u306b\u95a2\u3057\u3066\u3082\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u300c\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u300d\u3092\u3057\u3063\u304b\u308a\u5b66\u7fd2\u3057\u3066\u3001\u3088\u308a\u52b9\u7387\u7684\u306a\u5206\u5c90\u51e6\u7406\u304c\u66f8\u3051\u308b\u3088\u3046\u306b\u9811\u5f35\u308a\u307e\u3057\u3087\u3046\uff01<\/p>\n<h2>\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u3068\u306f\uff1f<\/h2>\n<p>\u305d\u308c\u3067\u306f\u3001<span style=\"color: #339966;\"><strong>\u300c\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u300d<\/strong><\/span>\u306e\u57fa\u672c\u7684\u306a\u5b66\u7fd2\u304b\u3089\u59cb\u3081\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n<p>\u300c\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u300d\u306f\u3001IF\u6587\u306e\u7701\u7565\u5f62\u307e\u305f\u306f\u4ee3\u66ff\u624b\u6bb5\u3068\u3057\u3066\u5229\u7528\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3001<span style=\"color: #ff0000; background-color: #ffff99;\"><strong>3\u3064\u306e\u5024\u30fb\u5f0f\u3092\u5fc5\u8981\u3068\u3059\u308b\u7279\u6b8a\u306a\u6f14\u7b97\u5b50<\/strong><\/span>\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u307e\u305a\u6700\u521d\u306b\u3001\u300cIF\u6587\u300d\u306e\u304a\u3055\u3089\u3044\u3092\u3082\u30461\u5ea6\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:js decode:true \" >if (\u6761\u4ef6\u5f0f) {\r\n\r\n    \/\/True\u306e\u51e6\u7406\r\n\r\n} else {\r\n\r\n    \/\/False\u306e\u51e6\u7406\r\n\r\n}<\/pre>\n<p>\u3053\u306e\u3088\u3046\u306b\u3001IF\u6587\u306f\u300c\u6761\u4ef6\u5f0f\u300d\u306e\u7d50\u679c\u306b\u5fdc\u3058\u3066\u3001<span style=\"color: #0000ff;\"><strong>\u300cTrue\u300d\u300cFalse\u300d\u306e\u51e6\u7406\u3092\u632f\u308a\u5206\u3051\u308b<\/strong><\/span>\u3053\u3068\u304c\u3067\u304d\u308b\u69cb\u6587\u3067\u3057\u305f\u3002<\/p>\n<p>\u4e0a\u8a18\u3068\u540c\u3058\u30b3\u30fc\u30c9\u3092\u300c\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u300d\u3067\u8a18\u8ff0\u3059\u308b\u3068\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true \" >\u6761\u4ef6\u5f0f ? True\u306e\u51e6\u7406 : False\u306e\u51e6\u7406<\/pre>\n<p>\u3068\u3066\u3082\u30b7\u30f3\u30d7\u30eb\u306a\u30b3\u30fc\u30c9\u306b\u5909\u308f\u308a\u307e\u3057\u305f\u306d\u3002<\/p>\n<p>\u3053\u3061\u3089\u306e\u30b3\u30fc\u30c9\u3067\u3082\u3001\u300cIF\u6587\u300d\u3068\u540c\u3058\u304f\u6761\u4ef6\u5f0f\u304c\u307e\u305a\u6700\u521d\u306b\u3042\u308a\u3001\u305d\u306e\u7d50\u679c\u304c\u300ctrue\u300d\u304b\u300cfalse\u300d\u306a\u306e\u304b\u306b\u3088\u3063\u3066\u51e6\u7406\u3092\u5206\u5c90\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><span style=\"color: #ff0000;\"><strong>\u5358\u7d14\u306a\u6761\u4ef6\u5f0f\u306b\u3088\u308b\u7d50\u679c\u304c\u77e5\u308a\u305f\u3044<\/strong><\/span>\u306e\u3067\u3042\u308c\u3070\u3001\u7c21\u6f54\u306b\u30b3\u30fc\u30c9\u304c\u66f8\u3051\u3066\u30d7\u30ed\u30b0\u30e9\u30e0\u3082\u30b9\u30c3\u30ad\u30ea\u3068\u898b\u3084\u3059\u3044\u300c\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u300d\u3092\u4f7f\u3063\u305f\u65b9\u304c\u52b9\u7387\u304c\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u3061\u306a\u307f\u306b\u3001\u300cIF\u6587\u300d\u306b\u3064\u3044\u3066\u5177\u4f53\u7684\u306a\u30b3\u30fc\u30c9\u3084\u305d\u306e\u6d3b\u7528\u4e8b\u4f8b\u3092\u3055\u3089\u306b\u77e5\u308a\u305f\u3044\u5834\u5408\u306f\u3001\u6b21\u306e\u8a18\u4e8b\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u306e\u3067\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<br \/>\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            <\/p>\n<h3>\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/h3>\n<p>\u6b21\u306b\u3001\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb\u4f8b\u3092\u78ba\u8a8d\u3057\u306a\u304c\u3089\u3001\u5b9f\u969b\u306b\u3069\u306e\u3088\u3046\u306a\u4f7f\u3044\u65b9\u3092\u3059\u308b\u306e\u304b\u3092\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n<p>\u307e\u305a\u306f\u3001\u6700\u3082\u5358\u7d14\u306a\u4f8b\u3067\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true \" >console.log( 5 &gt; 2 ? true : false );<\/pre>\n<p><span style=\"color: #0000ff;\"><strong>\u5b9f\u884c\u7d50\u679c<\/strong><\/span><\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \" >true<\/pre>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u306f\u6761\u4ef6\u5f0f\u304c\u300c5 &gt; 2\u300d\u3068\u306a\u3063\u3066\u304a\u308a\u3001<span style=\"color: #0000ff;\"><strong>\u6b63\u3057\u3044\u6761\u4ef6\u306a\u306e\u3067true\u306e\u51e6\u7406\u304c\u5b9f\u884c<\/strong><\/span>\u3055\u308c\u3066\u6700\u7d42\u7684\u306b\u306f\u300ctrue\u300d\u304c\u8868\u793a\u3055\u308c\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n<p>\u3082\u3061\u308d\u3093\u3001\u6700\u7d42\u7684\u306a\u7d50\u679c\u3092<span style=\"color: #339966;\"><strong>\u300c\u623b\u308a\u5024\u300d<\/strong><\/span>\u3068\u3057\u3066\u5909\u6570\u306b\u4ee3\u5165\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\uff01<\/p>\n<pre class=\"lang:js decode:true \" >var result = 5 &gt; 2 ? true : false;\r\n\r\nconsole.log( result );<\/pre>\n<p><span style=\"color: #0000ff;\"><strong>\u5b9f\u884c\u7d50\u679c<\/strong><\/span><\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \" >true<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u5909\u6570\u300cresult\u300d\u3078\u6761\u4ef6\u5f0f\u306e\u7d50\u679c\u3092\u4ee3\u5165\u3057\u3066\u51fa\u529b\u3057\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u5358\u7d14\u306a\u6761\u4ef6\u5206\u5c90\u3067\u3042\u308c\u3070\u300c\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u300d\u306e\u65b9\u304c\u7c21\u5358\u3067\u52b9\u7387\u3088\u304f\u8a18\u8ff0\u3067\u304d\u308b\u308f\u3051\u3067\u3059\uff01<\/p>\n<h3>\u5f0f\u306f\u7701\u7565\u3067\u304d\u306a\u3044<\/h3>\n<p>\u5192\u982d\u3067\u3082\u89e3\u8aac\u3057\u307e\u3057\u305f\u304c\u3001\u300c\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u300d\u306f3\u3064\u306e\u5024\u30fb\u5f0f\u3092\u5fc5\u8981\u3068\u3059\u308b\u6f14\u7b97\u5b50\u306a\u306e\u3067\u3001\u6b21\u306e\u3088\u3046\u306a\u7701\u7565\u306f\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true \" >\/\/false\u306e\u5f0f\u3092\u7701\u7565\r\n5 &gt; 2 ? true\u306e\u51e6\u7406;\r\n\r\n\/\/true\u306e\u5f0f\u3092\u7701\u7565\r\n5 &gt; 2 ? : false\u306e\u51e6\u7406;<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u300ctrue\u300d\u300cfalse\u300d\u305d\u308c\u305e\u308c\u306e\u5f0f\u3092\u7701\u7565\u3057\u3066\u3044\u307e\u3059\u304c\u3001<span style=\"color: #ff0000;\"><strong>\u3053\u308c\u306f\u30a8\u30e9\u30fc\u306b\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059<\/strong><\/span>\u3002<\/p>\n<p>\u4ed6\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u306f\u7701\u7565\u53ef\u80fd\u306a\u300c\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u300d\u304c\u3042\u3063\u305f\u308a\u3059\u308b\u306e\u3067\u3059\u304c\u3001JavaScript\u306b\u95a2\u3057\u3066\u306f\u7981\u6b62\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u6ce8\u610f\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n<h2>null\u3084undefined\u306a\u3069\u306e\u5224\u5b9a\u306b\u3064\u3044\u3066<\/h2>\n<p>JavaScript\u306b\u306f\u3001\u5024\u306e\u4e2d\u8eab\u304c\u300c\u7a7a\u3063\u307d\u300d\u306e\u72b6\u614b\u3092\u660e\u793a\u7684\u306b\u8868\u3059\u305f\u3081\u306e<span style=\"color: #339966;\"><strong>\u300cnull\u300d<\/strong><\/span>\u3084\u3001\u5909\u6570\u3084\u95a2\u6570\u306a\u3069\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u3092\u8868\u3059<span style=\"color: #339966;\"><strong>\u300cundefined\u300d<\/strong><\/span>\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u300cnull\u300d\u300cundefined\u300d\u3092\u6761\u4ef6\u5f0f\u306b\u5f53\u3066\u306f\u3081\u305f\u5834\u5408\u3001\u4e00\u4f53\u3069\u306e\u3088\u3046\u306a\u52d5\u4f5c\u3092\u3059\u308b\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n<p>\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u306f\u3001\u300cnull\u300d\u300cundefined\u300d\u304c\u542b\u307e\u308c\u305f\u6761\u4ef6\u5f0f\u3092\u6bd4\u8f03\u3057\u305f\u4f8b\u3067\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true \" >\/\/\u300cnull\u300d\u306e\u5834\u5408\r\nvar result1 = null ? true : false;\r\n\r\n\/\/\u300cundefined\u300d\u306e\u5834\u5408\r\nvar result2 = undefined ? true : false\r\n\r\nconsole.log( '\u3010null\u306e\u5834\u5408\u3011' + result1 );\r\nconsole.log( '\u3010undefined\u306e\u5834\u5408\u3011' + result2 );<\/pre>\n<p><span style=\"color: #0000ff;\"><strong>\u5b9f\u884c\u7d50\u679c<\/strong><\/span><\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \" >\u3010null\u306e\u5834\u5408\u3011false\r\n\r\n\u3010undefined\u306e\u5834\u5408\u3011false<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\u3092\u898b\u308b\u3068\u5206\u304b\u308a\u307e\u3059\u304c\u3001JavaScript\u3067\u306f\u300cnull\u300d\u300cundefined\u300d\u3092\u6761\u4ef6\u5f0f\u306b\u5f53\u3066\u306f\u3081\u308b\u3068\u3044\u305a\u308c\u3082<span style=\"color: #ff0000; background-color: #ffff99;\"><strong>\u300cFalse\u300d\u3068\u5224\u65ad\u3055\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/strong><\/span><\/p>\n<p>\u5b9f\u306f\u3001JavaScript\u306b\u306f\u540c\u3058\u3088\u3046\u306a\u300cfalse\u300d\u306b\u5224\u65ad\u3055\u308c\u3066\u3057\u307e\u30465\u5927\u6761\u4ef6\u3068\u3044\u3046\u306e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p><strong>\u30fb0\uff08\u6570\u5024\u306e0\uff09<br \/>\n\u30fbnull\uff08\u5024\u304c\u7a7a\u3067\u3042\u308b\u3053\u3068\u3092\u793a\u3059\u578b\uff09<br \/>\n\u30fbNaN\uff08\u6570\u5024\u3067\u306f\u306a\u3044\u3053\u3068\u3092\u793a\u3059\u30d7\u30ed\u30d1\u30c6\u30a3\uff09<br \/>\n\u30fbundefined\uff08\u5024\u304c\u672a\u5b9a\u7fa9\u3067\u3042\u308b\u3053\u3068\u3092\u793a\u3059\u578b\uff09<br \/>\n\u30fb&quot;&quot;\uff08\u7a7a\u306e\u6587\u5b57\u5217\uff09<br \/>\n<\/strong><br \/>\n\u4e0a\u8a18\u5185\u5bb9\u306f\u3059\u3079\u3066<span style=\"color: #0000ff;\"><strong>\u300cfalse\u300d\u3068\u5224\u65ad\u3055\u308c\u308b<\/strong><\/span>\u306e\u3067\u3001\u6761\u4ef6\u5f0f\u3092\u8a18\u8ff0\u3059\u308b\u969b\u306b\u306f\u6ce8\u610f\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\uff01<\/p>\n<h2>\u5024\u3092return(\u623b\u308a\u5024)\u3059\u308b\u65b9\u6cd5<\/h2>\n<p>\u6b21\u306b\u3001\u95a2\u6570\u306a\u3069\u3067\u300c\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u300d\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u5834\u5408\u306b\u3001<span style=\"color: #0000ff;\"><strong>\u7d50\u679c\u3092return(\u623b\u308a\u5024)\u3059\u308b\u65b9\u6cd5<\/strong><\/span>\u306b\u3064\u3044\u3066\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u306f\u3001\u7d50\u679c\u3092\u5909\u6570\u306b\u4ee3\u5165\u3059\u308b\u65b9\u6cd5\u3068\u307b\u3068\u3093\u3069\u540c\u3058\u8003\u3048\u65b9\u3067\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u6b21\u306e\u30b3\u30fc\u30c9\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"lang:js decode:true \" >function getResult() {\r\n    return 5 &gt; 2 ? true : false;\r\n}\r\n\r\nconsole.log( getResult() );<\/pre>\n<p><span style=\"color: #0000ff;\"><strong>\u5b9f\u884c\u7d50\u679c<\/strong><\/span><\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \" >true<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u95a2\u6570\u300cgetResult\u300d\u3092\u4f5c\u6210\u3057\u3066\u305d\u306e\u4e2d\u306b\u300c\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u300d\u3092\u305d\u306e\u307e\u307ereturn\u3057\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\u3001<span style=\"color: #ff0000;\"><strong>\u901a\u5e38\u306e\u300c\u5f0f\u300d\u3068\u540c\u3058\u6271\u3044\u3067<\/strong><\/span>return(\u623b\u308a\u5024)\u3059\u308c\u3070\u57fa\u672c\u7684\u306b\u306f\u554f\u984c\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u3061\u306a\u307f\u306b\u3067\u3059\u304c\u3001<span style=\"color: #0000ff;\"><strong>\u666e\u901a\u306eIF\u6587\u306e\u5834\u5408\u306f\u305d\u306e\u307e\u307ereturn\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044<\/strong><\/span>\u305f\u3081\u3001\u6b21\u306e\u3088\u3046\u306a\u30b3\u30fc\u30c9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true \" >function getResult() {\r\n    var result;\r\n\r\n    if(5 &gt; 2) result = true;\r\n    \r\n    return result;\r\n}\r\n\r\nconsole.log( getResult() );<\/pre>\n<p>\u5c11\u3057\u30b3\u30fc\u30c9\u304c\u5897\u3048\u307e\u3057\u305f\u306d\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u7528\u9014\u3084\u76ee\u7684\u306b\u5fdc\u3058\u3066\u300c\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u300d\u3092\u4f7f\u3046\u65b9\u304c\u7c21\u6f54\u306b\u30b3\u30fc\u30c9\u304c\u66f8\u3051\u308b\u3053\u3068\u304c\u3042\u308b\u306e\u3067\u899a\u3048\u3066\u304a\u304f\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\uff01<\/p>\n<h2>\u51e6\u7406\u3092\u6539\u884c\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066<\/h2>\n<p>JavaScript\u306f\u3001\u30b3\u30fc\u30c9\u5185\u306b\u304a\u3051\u308b<span style=\"color: #339966;\"><strong>\u300c\u6539\u884c\u300d<\/strong><\/span>\u3084<span style=\"color: #339966;\"><strong>\u300c\u30a4\u30f3\u30c7\u30f3\u30c8\u300d<\/strong><\/span>\u306e\u81ea\u7531\u5ea6\u304c\u9ad8\u3044\u306e\u3067\u3059\u304c\u3001\u305d\u308c\u306f\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u306b\u3064\u3044\u3066\u3082\u540c\u3058\u3053\u3068\u304c\u8a00\u3048\u307e\u3059\u3002<\/p>\n<p>\u53ef\u8aad\u6027\u3092\u9ad8\u3081\u308b\u305f\u3081\u306b\u3082\u3001\u5834\u5408\u306b\u3088\u3063\u3066\u306f\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u306e\u3088\u3046\u306a\u66f8\u304d\u65b9\u304c\u3067\u304d\u308b\u3053\u3068\u3092\u899a\u3048\u3066\u304a\u304f\u3068\u826f\u3044\u3067\u3057\u3087\u3046\uff01<\/p>\n<pre class=\"lang:js decode:true \" >var item = '\u30d0\u30ca\u30ca';\r\n\r\nitem === '\u30d0\u30ca\u30ca'\r\n    ? console.log('\u6b63\u3057\u3044\u3067\u3059\uff01')\r\n    : console.log('\u9593\u9055\u3063\u3066\u307e\u3059\uff01')<\/pre>\n<p><span style=\"color: #0000ff;\"><strong>\u5b9f\u884c\u7d50\u679c<\/strong><\/span><\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \" >\u6b63\u3057\u3044\u3067\u3059\uff01<\/pre>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u306f\u3001\u6761\u4ef6\u5f0f\u3092\u66f8\u3044\u305f\u3042\u3068\u306b\u6539\u884c\u3068\u30a4\u30f3\u30c7\u30f3\u30c8\u3092\u5165\u308c\u308b\u3053\u3068\u3067\u3001True\u306e\u51e6\u7406\u3068False\u306e\u51e6\u7406\u304c\u898b\u3084\u3059\u304f\u306a\u3063\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\u5c11\u3057\u9577\u3044\u30b3\u30fc\u30c9\u3067\u3042\u308c\u3070\u3055\u3089\u306b\u6709\u52b9\u306b\u6d3b\u7528\u3067\u304d\u308b\u3068\u601d\u3044\u307e\u3059\u306e\u3067\u3001\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n<h2>\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u306e\u5fdc\u7528\u30c6\u30af\u30cb\u30c3\u30af<\/h2>\n<p>\u3053\u3053\u307e\u3067\u306f\u3001\u300c\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u300d\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3092\u5b66\u7fd2\u3057\u3066\u304d\u307e\u3057\u305f\u3002<\/p>\n<p>\u4e00\u822c\u7684\u306b\u306f\u3001<span style=\"color: #0000ff;\"><strong>\u7c21\u6613\u7684\u306a\u30b3\u30fc\u30c9\u3092\u52b9\u7387\u3088\u304f\u8a18\u8ff0\u3059\u308b<\/strong><\/span>\u3053\u3068\u3067\u30e1\u30ea\u30c3\u30c8\u306e\u3042\u308b\u300c\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u300d\u306a\u306e\u3067\u3059\u304c\u3001\u3082\u3046\u5c11\u3057\u5fdc\u7528\u7684\u306a\u4f7f\u3044\u65b9\u3092\u3054\u7d39\u4ecb\u81f4\u3057\u307e\u3059\uff01<\/p>\n<p>\u76ee\u7684\u3084\u7528\u9014\u306b\u5fdc\u3058\u3066\u3001\u5c11\u3057\u8907\u96d1\u306a\u30b3\u30fc\u30c9\u3092\u6761\u4ef6\u5206\u5c90\u3055\u305b\u308b\u3088\u3046\u306a\u30b1\u30fc\u30b9\u3067\u5f79\u306b\u7acb\u3064\u30c6\u30af\u30cb\u30c3\u30af\u306a\u306e\u3067\u3001\u305c\u3072\u5408\u308f\u305b\u3066\u5b66\u7fd2\u3092\u9032\u3081\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n<h3>\u51e6\u7406\u3092\u5165\u308c\u5b50\u306b\u3059\u308b\u65b9\u6cd5<\/h3>\n<p>\u3053\u308c\u307e\u3067\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u3092\u5358\u4f53\u3067\u5229\u7528\u3057\u3066\u3044\u307e\u3057\u305f\u304c\u3001<span style=\"color: #339966;\"><strong>\u5165\u308c\u5b50\u69cb\u9020<\/strong><\/span>\u306b\u3057\u3066\u5225\u306e\u6761\u4ef6\u5f0f\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3082\u53ef\u80fd\u306a\u306e\u3067\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u3092\u898b\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n<pre class=\"lang:js decode:true \" >var firstItem = '\u308a\u3093\u3054';\r\nvar secondItem = null;\r\n\r\n\/\/\u300ctrue\u300d\u306e\u51e6\u7406\u3067\u3082\u30461\u3064\u306e\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u5b9f\u884c\u3057\u3066\u3044\u308b\r\nvar result = firstItem === '\u308a\u3093\u3054' ? secondItem ? 'OK' : '2\u56de\u76eeNG' : '\u521d\u56deNG'\r\n\r\nconsole.log( result );<\/pre>\n<p><span style=\"color: #0000ff;\"><strong>\u5b9f\u884c\u7d50\u679c<\/strong><\/span><\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \" >2\u56de\u76eeNG<\/pre>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u306f\u3001\u307e\u305a\u6700\u521d\u306b\u300cfirstItem === &#8216;\u308a\u3093\u3054&#8217;\u300d\u3092\u6bd4\u8f03\u3057\u3066\u4e00\u81f4\u3057\u3066\u3044\u308b\u306e\u3067true\u306e\u51e6\u7406\u306b\u79fb\u52d5\u3057\u307e\u3059\u3002<\/p>\n<p>\u6b21\u306b\u3001null\u304c\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u300csecondItem\u300d\u3092\u6bd4\u8f03\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u3053\u308c\u306ffalse\u306e\u51e6\u7406\u306b\u79fb\u52d5\u3059\u308b\u305f\u3081\u3001\u6700\u7d42\u7684\u306b\u300c\u521d\u56deNG\u300d\u3068\u3044\u3046\u6587\u5b57\u5217\u304c\u51fa\u529b\u3055\u308c\u3066\u3044\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n<p>\u5148\u307b\u3069\u5b66\u7fd2\u3057\u305f<span style=\"color: #339966;\"><strong>\u300c\u6539\u884c\u300d<\/strong><\/span>\u3092\u5165\u308c\u3066\u898b\u3084\u3059\u304f\u3059\u308b\u3068\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true \" >var result = firstItem === '\u308a\u3093\u3054'\r\n           ? secondItem ? 'OK' : '2\u56de\u76eeNG'\r\n           : '\u521d\u56deNG'<\/pre>\n<p>true\u306e\u51e6\u7406\u3067\u3001\u3082\u30461\u3064\u306e\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u304c\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u306e\u304c\u3088\u304f\u5206\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n<p>\u6163\u308c\u308b\u3068\u4fbf\u5229\u306a\u8a18\u8ff0\u3067\u3059\u304c\u3001\u5165\u308c\u5b50\u306e<span style=\"color: #0000ff;\"><strong>\u968e\u5c64\u304c\u6df1\u304f\u306a\u308b\u3068\u9006\u306b\u628a\u63e1\u3057\u3065\u3089\u304f\u306a\u308b<\/strong><\/span>\u306e\u3067\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>\u6761\u4ef6\u5f0f\u3092\u8907\u6570\u7d44\u307f\u5408\u308f\u305b\u308b\u65b9\u6cd5<\/h3>\n<p>\u300c\u5165\u308c\u5b50\u69cb\u9020\u300d\u306f\u3001\u3069\u3061\u3089\u304b\u3068\u8a00\u3046\u3068\u7c21\u6613\u7684\u306a\u51e6\u7406\u3092\u884c\u3046\u5834\u5408\u306b\u6709\u52b9\u306a\u65b9\u6cd5\u3067\u3001<span style=\"color: #ff0000;\"><strong>\u8907\u6570\u884c\u306e\u30b3\u30fc\u30c9\u304c\u5fc5\u8981\u306b\u306a\u3063\u3066\u304f\u308b\u3068<\/strong><\/span>\u8aad\u307f\u3065\u3089\u304f\u306a\u3063\u3066\u3042\u307e\u308a\u5b9f\u7528\u7684\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u305d\u3053\u3067\u3001\u89e3\u6c7a\u7b56\u3068\u3057\u3066\u306f<span style=\"color: #339966;\"><strong>( )<\/strong><\/span>\u3067\u51e6\u7406\u3092\u56f2\u3063\u3066\u3057\u307e\u3044\u3001<span style=\"color: #339966;\"><strong>\u300c, \uff08\u30ab\u30f3\u30de\uff09\u300d<\/strong><\/span>\u3067\u533a\u5207\u308b\u3053\u3068\u3067\u5bfe\u5fdc\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u3092\u898b\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n<pre class=\"lang:js decode:true \" >var item = 50;\r\n \r\nitem &gt; 35 ? (\r\n         \/\/true\u306e\u5834\u5408\r\n         item++,\r\n         console.log( item )\r\n) : (\r\n         \/\/false\u306e\u5834\u5408\r\n         item--,\r\n         console.log( item )\r\n);<\/pre>\n<p><span style=\"color: #0000ff;\"><strong>\u5b9f\u884c\u7d50\u679c<\/strong><\/span><\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \" >51<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001true\u30fbfalse\u305d\u308c\u305e\u308c\u306e\u51e6\u7406\u3092<span style=\"color: #0000ff;\"><strong>( )\u3067\u56f2\u3046\u3053\u3068\u3067\u8907\u6570\u884c\u306e\u51e6\u7406\u3092\u898b\u3084\u3059\u304f\u8a18\u8ff0\u3067\u304d\u3066\u3044\u308b<\/strong><\/span>\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n<p>\u51e6\u7406\u306e\u5185\u5bb9\u3068\u3057\u3066\u306f\u3001\u300citem &gt; 35\u300d\u3092\u6bd4\u8f03\u3057\u3066True\u306e\u51e6\u7406\u3092\u5b9f\u884c\u3057\u3001\u5909\u6570\u300citem\u300d\u3092\u30ab\u30a6\u30f3\u30c8\u30a2\u30c3\u30d7\u3057\u3066\u305d\u306e\u4e2d\u8eab\u3092\u51fa\u529b\u3057\u3066\u3044\u307e\u3059<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u4eca\u56de\u306f\u3001\u300cIF\u6587\u300d\u3068\u540c\u3058\u3088\u3046\u306a\u51e6\u7406\u3092\u7c21\u5358\u304b\u3064\u52b9\u7387\u3088\u304f\u8a18\u8ff0\u3067\u304d\u308b<span style=\"color: #339966;\"><strong>\u300c\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u300d<\/strong><\/span>\u306b\u3064\u3044\u3066\u5b66\u7fd2\u3057\u307e\u3057\u305f\uff01<\/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><strong>\u30fb\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u306f\u300c? :\u300d\u3092\u4f7f\u3063\u3066\u30013\u3064\u306e\u5024\u30fb\u5f0f\u3092\u3068\u308b\u6f14\u7b97\u5b50\u3067\u3042\u308b<br \/>\n\u30fb\u300cnull\u300d\u300c0\u300d\u300cNaN\u300d\u300cundefined\u300d\u300c&#8221;\u300d\u306f\u3059\u3079\u3066False\u306e\u51e6\u7406\u306b\u306a\u308b\uff01<br \/>\n\u30fb\u7d50\u679c\u3092\u5909\u6570\u3078\u76f4\u63a5\u4ee3\u5165\u3057\u305f\u308a\u3001return\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b<br \/>\n\u30fb\u6539\u884c\u3068\u30a4\u30f3\u30c7\u30f3\u30c8\u3092\u5165\u308c\u308b\u3053\u3068\u3067\u53ef\u8aad\u6027\u3092\u9ad8\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u308b\uff01<br \/>\n\u30fb\u5165\u308c\u5b50\u69cb\u9020\u306b\u3057\u305f\u308a\u3001( )\u3067\u8907\u6570\u306e\u51e6\u7406\u3092\u540c\u6642\u306b\u5b9f\u884c\u3067\u304d\u308b\uff01<br \/>\n<\/strong><br \/>\n\u4e0a\u8a18\u5185\u5bb9\u3092\u8e0f\u307e\u3048\u306a\u304c\u3089\u3001\u305c\u3072\u81ea\u5206\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u3082\u7a4d\u6975\u7684\u306b\u53d6\u308a\u5165\u308c\u3066\u4f7f\u3044\u3053\u306a\u305b\u308b\u3088\u3046\u306b\u306a\u308a\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<\/p>\n<p>\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\u3001\u300cIF\u6587\u300d\u3092\u7c21\u7565\u7684\u304b\u3064\u52b9\u7387\u3088\u304f\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u308b\u300c\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u300d\u306b\u3064\u3044\u3066\u5b66\u7fd2\u3057\u307e\u3057\u3087\u3046\uff01 \u300c\u6761\u4ef6(\u4e09\u9805)\u6f14\u7b97\u5b50\u300d\u306b\u306f\u3001\u3055\u307e\u3056\u307e\u306a\u66f8\u304d\u65b9\u3084\u4f7f\u3044\u65b9\u306e\u30c6\u30af\u30cb\u30c3\u30af\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u672c\u8a18 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