{"id":23884,"date":"2017-05-26T14:43:46","date_gmt":"2017-05-26T05:43:46","guid":{"rendered":"http:\/\/www.sejuku.net\/blog\/?p=23884"},"modified":"2024-05-06T11:42:46","modified_gmt":"2024-05-06T02:42:46","slug":"%e8%a6%81%e6%b3%a8%e6%84%8f%ef%bc%81%ef%bc%9fjavascript%e3%81%ae%e6%95%b0%e5%80%a4%e3%83%81%e3%82%a7%e3%83%83%e3%82%af6%e3%81%ae%e3%83%86%e3%82%af%e3%83%8b%e3%83%83%e3%82%af","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/23884","title":{"rendered":"\u3010JavaScript\u5165\u9580\u3011\u6570\u5024\u30c1\u30a7\u30c3\u30af\u306e\u65b9\u6cd5\u307e\u3068\u3081(isNaN\/isFinite)"},"content":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\uff01Web\u30b3\u30fc\u30c0\u30fc\u30fb\u30d7\u30ed\u30b0\u30e9\u30de\u30fc\u306e\u8c9d\u539f\uff08<a href=\"https:\/\/twitter.com\/touhicomu\" target=\"_blank\" rel=\"noopener noreferrer\">@touhicomu<\/a>\uff09\u3067\u3059\u3002<\/p>\n<p>\u4eca\u65e5\u306f\u3001JavaScript\u306e\u6570\u5024\u306e\u30c1\u30a7\u30c3\u30af\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<p>\u6570\u5024\u306e\u30c1\u30a7\u30c3\u30af\u65b9\u6cd5\u3092\u8003\u3048\u3066\u307f\u308b\u3068\u3001<br \/>\n<div class=\"box01\"><\/p>\n<ul>\n<li><b>\u5909\u6570\u304c\u6570\u5024\u304b\u3069\u3046\u304b\u30c1\u30a7\u30c3\u30af\u3057\u305f\u3044\uff01\u3046\u307e\u3044\u6b63\u898f\u8868\u73fe\u3068\u304b\u306a\u3044\u306e\uff1f<\/b><\/li>\n<li><b>\u5c0f\u6570\u70b9\u3001\u30ab\u30f3\u30de\u3001+\u7b26\u53f7\u3001-\u7b26\u53f7\u30010\u59cb\u307e\u308a\u3082\u8003\u616e\u3057\u3066\u30c1\u30a7\u30c3\u30af\u3057\u3066\u6b32\u3057\u3044<\/b><\/li>\n<li><b>\u6570\u5024\u306e\u7bc4\u56f2\u3084\u6841\u6570\u3092\u30c1\u30a7\u30c3\u30af\u3057\u305f\u3044\uff01\u3046\u307e\u3044\u65b9\u6cd5\u306f\u306a\u3044\u306e\uff1f<\/b><\/li>\n<\/ul>\n<p><\/div><br \/>\n\u306a\u3069\u306e\u7591\u554f\u304c\u6d6e\u304b\u3076\u306e\u3082\u3046\u306a\u3065\u3051\u307e\u3059\u3002<\/p>\n<p>\u305d\u3053\u3067\uff01\u4eca\u65e5\u306f\u3001<br \/>\n<div class=\"box01\"><\/p>\n<ul>\n<li><b>\u6570\u5024\u304b\u3069\u3046\u304b\u306e\u30c1\u30a7\u30c3\u30af\u65b9\u6cd5<\/b><\/li>\n<li><b>\u5c0f\u6570\u70b9\u3001\u30ab\u30f3\u30de\u306a\u3069\u306e\u30c1\u30a7\u30c3\u30af\u65b9\u6cd5<\/b><\/li>\n<li><b>\u6570\u5024\u306e\u7bc4\u56f2\u3084\u6841\u6570\u306e\u30c1\u30a7\u30c3\u30af\u65b9\u6cd5<\/b><\/li>\n<\/ul>\n<p><\/div><br \/>\n\u306b\u3064\u3044\u3066\u3001\u89e3\u8aac\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<p>\u305d\u308c\u3067\u306f\u3001\u884c\u3063\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n<h2>\u6570\u5024\u304b\u3069\u3046\u304b\u306e\u30c1\u30a7\u30c3\u30af\u65b9\u6cd5<\/h2>\n<h3>isNaN\u306b\u3088\u308b\u65b9\u6cd5<\/h3>\n<p>\u5024\u304c\u6570\u5024\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u65b9\u6cd5\u306e\u4e00\u3064\u3068\u3057\u3066\u3001\u300c\u6570\u5024\u3067\u306a\u3044\u3068\u304d\u306btrue\u3068\u306a\u308b\u300disNaN\uff08is Not a Number\uff09\u30e1\u30bd\u30c3\u30c9\u306b\u3088\u308b\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>isNaN\u304c\u3069\u3046\u3044\u3046\u5024\u306e\u6642true\u3092\u8fd4\u3057\uff08\u5024\u304c\u6570\u5024\u3067\u306a\u3044\uff09\u3001\u3069\u3046\u3044\u3046\u5024\u306e\u6642false\u3092\u8fd4\u3059\uff08\u5024\u304c\u6570\u5024\uff09\u306e\u304b\u3001\u4ee5\u4e0b\u3001\u5b9f\u969b\u306e\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:js decode:true \">window.onload = function () {\r\n    \/\/ \u6570\u5024\u304b\u3069\u3046\u304b\u306e\u30c1\u30a7\u30c3\u30af\u65b9\u6cd5\r\n    \/\/ isNaN\u306b\u3088\u308b\u65b9\u6cd5\r\n    \/\/ isNaN\u306f\u3001\u6570\u5024\u3067\u306f\u306a\u3044\u5834\u5408\u306btrue\u306b\u306a\u308b\r\n\r\n    console.log('isNaN(\"abc\") = ' + isNaN(\"abc\"));\r\n    console.log('isNaN(\"123abc\") = ' + isNaN(\"123abc\"));\r\n    console.log('isNaN(\"123\") = ' + isNaN(\"123\"));\r\n    console.log('isNaN(123) = ' + isNaN(123));\r\n    console.log('isNaN([1, 2]) = ' + isNaN([1, 2]));\r\n    console.log('isNaN({ a: 1 }) = ' + isNaN({ a: 1 }));\r\n\r\n\u3000\u3000\/\/ 8\u9032\u6570 \/ 16\u9032\u6570\r\n    console.log('isNaN(0755) = ' + isNaN(0755));\r\n    console.log('isNaN(0xFF) = ' + isNaN(0xFF));\r\n\r\n    \/\/ true \/ false\r\n    console.log('isNaN(true) = ' + isNaN(true));\r\n    console.log('isNaN(false) = ' + isNaN(false));\r\n\r\n    \/\/ \u305d\u306e\u4ed6\r\n    console.log('isNaN(Infinity) = ' + isNaN(Infinity)); \/\/ \u7121\u9650\u5927\r\n    console.log('isNaN(undefined) = ' + isNaN(undefined));\r\n    console.log('isNaN(null) = ' + isNaN(null));\r\n    console.log('isNaN(NaN) = ' + isNaN(NaN));\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 \">isNaN(\"abc\") = true\r\nisNaN(\"123abc\") = true\r\nisNaN(\"123\") = false\r\nisNaN(123) = false\r\nisNaN([1, 2]) = true\r\nisNaN({ a: 1 }) = true\r\n\r\nisNaN(0755) = false\r\nisNaN(0xFF) = false\r\n\r\nisNaN(true) = false\r\nisNaN(false) = false\r\n\r\nisNaN(Infinity) = false\r\nisNaN(undefined) = true\r\nisNaN(null) = false\r\nisNaN(NaN) = true\r\n<\/pre>\n<p>\u4ee5\u4e0a\u306e\u3088\u3046\u306b\u3001<b>\u660e\u3089\u304b\u306b\u6570\u5024\u3067\u306a\u3044\u6587\u5b57\u5217\u3068\u3001undefined\u3001\u914d\u5217\u3068\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3001\u305d\u308c\u306bNaN\u306e\u5834\u5408\u306bisNaN()\u306ftrue\u3092\u8fd4\u3057\u3001\u6570\u5024\u3067\u306a\u3044\u3068\u5224\u65ad<\/b>\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u305f\u3060\u3057\u3001null\u306e\u5834\u5408\u306fisNaN()\u306ffalse\u3092\u8fd4\u3057\u3001\u6570\u5024\u3067\u3042\u308b\u3068\u5224\u65ad\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306f\u3001null\u306f\u6570\u5b57\u4e0a0\u3068\u6271\u308f\u308c\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n<p>\u6570\u5024\u3068\u89e3\u91c8\u3067\u304d\u308b\u6587\u5b57\u5217\u30018\u9032\u6570\u306e\u6570\u5024\u30ea\u30c6\u30e9\u30eb(0\u304b\u3089\u59cb\u307e\u308b\u6570\u5024\uff09\u3068\u300116\u9032\u6570\u306e\u6570\u5024\u30ea\u30c6\u30e9\u30eb\uff080x\u3067\u59cb\u307e\u308b\u6570\u5024\uff09\u306e\u5834\u5408\u3084\u3001\u7121\u9650\u5927\u3092\u8868\u3059\u6570\u5024\u30ea\u30c6\u30e9\u30ebInfinty\u306e\u5834\u5408\u3001Boolean\u578b\u306e\u5024\u306e\u5834\u5408\u306f\u3001isNaN()\u306ffalse\u3092\u8fd4\u3057\u3001\u6570\u5024\u3067\u3042\u308b\u3068\u5224\u65ad\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>NaN\u306b\u3064\u3044\u3066\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\/58911\" 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\/image20-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010JavaScript\u5165\u9580\u3011\u4eca\u3055\u3089\u805e\u3051\u306a\u3044\uff01NaN\u306e\u4f7f\u3044\u65b9\u3068\u5224\u5b9a\u65b9\u6cd5\u307e\u3068\u3081<\/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>isFinite\u306b\u3088\u308b\u65b9\u6cd5<\/h3>\n<p>\u5024\u304c\u6570\u5024\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u65b9\u6cd5\u3068\u3057\u3066\u300c\u6709\u9650\u306e\u6570\u5024\u3067\u3042\u308b\u306btrue\u3068\u306a\u308b\u300disFinite\u30e1\u30bd\u30c3\u30c9\u306b\u3088\u308b\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>isFinite\u304c\u3069\u3046\u3044\u3046\u5024\u306e\u6642true\u3092\u8fd4\u3057\uff08\u5024\u304c\u6709\u9650\u306e\u6570\u5024\uff09\u3001\u3069\u3046\u3044\u3046\u5024\u306e\u6642false\u3092\u8fd4\u3059\uff08\u5024\u304c\u6709\u9650\u306e\u6570\u5024\u3067\u306a\u3044\uff09\u306e\u304b\u3001\u4ee5\u4e0b\u3001\u5b9f\u969b\u306e\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:js decode:true \"> window.onload = function () {\r\n    \/\/ \u6570\u5024\u304b\u3069\u3046\u304b\u306e\u30c1\u30a7\u30c3\u30af\u65b9\u6cd5\r\n    \/\/ isFinite\u306b\u3088\u308b\u65b9\u6cd5\r\n    console.log('isFinite(\"abc\") = ' + isFinite(\"abc\"));\r\n    console.log('isFinite(\"123abc\") = ' + isFinite(\"123abc\"));\r\n    console.log('isFinite(\"123\") = ' + isFinite(\"123\"));\r\n    console.log('isFinite(123) = ' + isFinite(123));\r\n    console.log('isFinite([1, 2]) = ' + isFinite([1, 2]));\r\n    console.log('isFinite({ a: 1 }) = ' + isFinite({ a: 1 }));\r\n\r\n\u3000\u3000\/\/ 8\u9032\u6570 \/ 16\u9032\u6570\r\n    console.log('isFinite(0755) = ' + isFinite(0755));\r\n    console.log('isFinite(0xFF) = ' + isFinite(0xFF));\r\n\r\n    \/\/ true \/ false\r\n    console.log('isFinite(true) = ' + isFinite(true));\r\n    console.log('isFinite(false) = ' + isFinite(false));\r\n\r\n    \/\/ \u305d\u306e\u4ed6\r\n    console.log('isFinite(Infinity) = ' + isFinite(Infinity)); \/\/ \u7121\u9650\u5927\r\n    console.log('isFinite(undefined) = ' + isFinite(undefined));\r\n    console.log('isFinite(null) = ' + isFinite(null));\r\n    console.log('isFinite(NaN) = ' + isFinite(NaN));\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 \">isFinite(\"abc\") = false\r\nisFinite(\"123abc\") = false\r\nisFinite(\"123\") = true\r\nisFinite(123) = true\r\nisFinite([1, 2]) = false\r\nisFinite({ a: 1 }) = false\r\n\r\nisFinite(0755) = true\r\nisFinite(0xFF) = true\r\n\r\nisFinite(true) = true\r\nisFinite(false) = true\r\n\r\nisFinite(Infinity) = false\r\nisFinite(undefined) = false\r\nisFinite(null) = true\r\nisFinite(NaN) = false\r\n<\/pre>\n<p>\u4ee5\u4e0a\u306e\u3088\u3046\u306b\u3001\u660e\u3089\u304b\u306b\u6570\u5024\u3067\u306a\u3044\u6587\u5b57\u5217\u3068\u3001undefined\u3001\u914d\u5217\u3068\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3001\u305d\u308c\u306b\u7121\u9650\u5927Infinity\u3068\u975e\u6570\u5024NaN\u306e\u5834\u5408\u306bisFinite()\u306ffalse\u3092\u8fd4\u3057\u3001\u6709\u9650\u306e\u6570\u5024\u3067\u306a\u3044\u3068\u5224\u65ad\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u305f\u3060\u3057\u3001null\u306e\u5834\u5408\u306fisFinite()\u306ftrue\u3092\u8fd4\u3057\u3001\u6709\u9650\u306e\u6570\u5024\u3067\u3042\u308b\u3068\u5224\u65ad\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306f\u3001null\u306f\u6570\u5b57\u4e0a0\u3068\u6271\u308f\u308c\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n<p>\u6570\u5024\u3068\u89e3\u91c8\u3067\u304d\u308b\u6587\u5b57\u5217\u30018\u9032\u6570\u306e\u6570\u5024\u30ea\u30c6\u30e9\u30eb(0\u304b\u3089\u59cb\u307e\u308b\u6570\u5024\uff09\u3068\u300116\u9032\u6570\u306e\u6570\u5024\u30ea\u30c6\u30e9\u30eb\uff080x\u3067\u59cb\u307e\u308b\u6570\u5024\uff09\u306e\u5834\u5408\u3001Boolean\u578b\u306e\u5024\u306e\u5834\u5408\u3001isFinite()\u306ftrue\u3092\u8fd4\u3057\u3001\u6709\u9650\u306e\u6570\u5024\u3067\u3042\u308b\u3068\u5224\u65ad\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>\u6570\u5024\u5909\u63db\u5f8c\u306e\u30c1\u30a7\u30c3\u30af\u306b\u3064\u3044\u3066<\/h3>\n<p>\u3053\u308c\u307e\u3067\u3054\u7d39\u4ecb\u3057\u305f\u30c1\u30a7\u30c3\u30af\u65b9\u6cd5\u306f\u3001<b>\u6570\u5024\u3092\u5909\u63db\u3057\u305f\u3042\u3068\u306b\u6b63\u3057\u304f\u51e6\u7406\u304c\u884c\u308f\u308c\u305f\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3059\u308b\u3068\u304d<\/b>\u306b\u3088\u304f\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>\n<p>\u305d\u3053\u3067\u3001\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb\u4f8b\u3092\u3082\u3068\u306b\u5909\u63db\u5f8c\u306e\u30c1\u30a7\u30c3\u30af\u4f8b\u3092\u89e3\u8aac\u3057\u3066\u304a\u304d\u307e\u3059\uff01<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u300c300px\u300d\u3068\u3044\u3046\u5024\u3092\u305d\u306e\u307e\u307e\u6570\u5024\u5909\u63db\u3057\u305f\u5834\u5408\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:js decode:true \">var str = '300px';\r\nvar result = Number( str );  \/\/\u6570\u5024\u306b\u5909\u63db\u3059\u308b\r\n\r\n\r\n\/\/\u6b63\u3057\u304f\u5909\u63db\u3055\u308c\u305f\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\r\nif( isNaN(result) ) {\r\n\r\n    console.log('\u6570\u5024\u3067\u306f\u3042\u308a\u307e\u305b\u3093');\r\n\r\n}\r\nelse {\r\n\r\n    console.log('\u6570\u5024\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 \">\u6570\u5024\u3067\u306f\u3042\u308a\u307e\u305b\u3093<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u6570\u5024\u5909\u63db\u3059\u308b\u305f\u3081\u306bNumber\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5f15\u6570\u3068\u3057\u3066\u300c300px\u300d\u3068\u3044\u3046\u6587\u5b57\u5217\u3092\u4ee3\u5165\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057\u306a\u304c\u3089\u3001\u300cpx\u300d\u3068\u3044\u3046\u6587\u5b57\u5217\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u306e\u3067\u5909\u63db\u5f8c\u306e\u5024\u306f\u300cNaN\u300d\u306e\u6271\u3044\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u3053\u3067\u3001IF\u6587\u3092\u4f7f\u3044\u6761\u4ef6\u5f0f\u3068\u3057\u3066\u300cisNaN()\u300d\u3092\u3082\u3068\u306b\u300ctrue \/ false\u300d\u3092\u8fd4\u3059\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3059\u308c\u3070\u3001<b>\u6570\u5024\u3068\u3057\u3066\u5909\u63db\u3055\u308c\u306a\u304b\u3063\u305f\u5834\u5408\u306b\u306f\u4e8b\u524d\u306b\u4f55\u3089\u304b\u306e\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u8d77\u3053\u3059\u3053\u3068\u304c\u53ef\u80fd<\/b>\u306a\u306e\u3067\u3001\u4e0d\u660e\u306a\u30d0\u30b0\u306b\u6642\u9593\u3092\u8cbb\u3084\u3059\u3053\u3068\u3082\u306a\u304f\u306a\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u3061\u306a\u307f\u306b\u3001\u3055\u3089\u306a\u308b\u6570\u5024\u5909\u63db\u306e\u30b5\u30f3\u30d7\u30eb\u4e8b\u4f8b\u3084\u5c0f\u6570\u70b9\u30fb\u30ab\u30f3\u30de\u533a\u5207\u308a\u306a\u3069\u306b\u3088\u308b\u5909\u63db\u4f8b\u3092\u3001\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\/23998\" 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\/2017\/08\/image-211-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010Javascript\u5165\u9580\u3011\u6570\u5024\u21d4\u6587\u5b57\u5217\u306e\u5909\u63db(toString\/Number\/parseInt)<\/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>\u6b63\u898f\u8868\u73fe\u306b\u3088\u308b\u65b9\u6cd5<\/h3>\n<p>\u6b63\u898f\u8868\u73fe\u306b\u6570\u5024\u3092\u8868\u3059\u6587\u5b57\u5217\u304c\u30de\u30c3\u30c1\u3059\u308b\u304b\u3069\u3046\u304b\u3067\u3001\u6570\u5024\u306e\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3063\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u6307\u5b9a\u3057\u305f\u6b63\u898f\u8868\u73fe\u306b\u542b\u307e\u308c\u308b\u5024\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u305f\u3081\u306b\u306f\u3001search\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<p>\u6570\u5024\u3092\u8868\u3059\u6b63\u898f\u8868\u73fe\u306f\u3001\/^[0-9]+$\/ \u3067\u3001\u3053\u308c\u306f\u3001\u300c0\uff5e9\u306e\u6570\u5b57\u304c\u884c\u982d\u304b\u3089\u884c\u672b\u307e\u3067\u4e26\u3093\u3067\u3044\u308b\u300d\u6587\u5b57\u5217\u3068\u30de\u30c3\u30c1\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\u4eca\u7bc0\u3067\u4f7f\u7528\u3059\u308b\u6b63\u898f\u8868\u73fe\u306f\u7c21\u6f54\u306a\u3082\u306e\u3067\u3001\u307e\u305a\u306f\u6b63\u898f\u8868\u73fe\u3067\u306e\u6570\u5024\u30c1\u30a7\u30c3\u30af\u306e\u6d41\u308c\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306e\u3082\u306e\u3067\u3059\u3002<\/p>\n<p>\u3088\u308a\u8a73\u7d30\u306a\u3001\u30ab\u30f3\u30de\u3064\u304d\u3001\u5c0f\u6570\u70b9\u3064\u304d\u306e\u6570\u5b57\u306a\u3069\u306e\u30c1\u30a7\u30c3\u30af\u306f\u6b21\u7ae0\u3067\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true \">window.onload = function () {\r\n    \/\/ \u6b63\u898f\u8868\u73fe\u306b\u3088\u308b\u65b9\u6cd5\r\n    var n01 = \"123\";\r\n    var n02 = \"123abc\"\r\n\r\n    console.log('n01.search(\/^[0-9]+$\/) = ' + n01.search(\/^[-]?[0-9]+$\/));\r\n    console.log('n02.search(\/^[0-9]+$\/) = ' + n02.search(\/^[-]?[0-9]+$\/));\r\n}\r\n<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">n01.search(\/^[0-9]+$\/) = 0\r\nn02.search(\/^[0-9]+$\/) = -1\r\n<\/pre>\n<p>\u4ee5\u4e0a\u306e\u3088\u3046\u306b\u3001\u660e\u3089\u304b\u306b\u6570\u5b57\u3067\u3042\u308b\u5909\u6570n01\u306f0\u6587\u5b57\u76ee\u304b\u3089\u6b63\u898f\u8868\u73fe\u3068\u30de\u30c3\u30c1\u3059\u308b\u306e\u3067\u3001\u8fd4\u5024\u304c0\u3067\u3057\u305f\u3002<\/p>\n<p>\u307e\u305f\u3001\u660e\u3089\u304b\u306b\u6570\u5b57\u3067\u306a\u3044\u5909\u6570n02\u306f\u6b63\u898f\u8868\u73fe\u3068\u30de\u30c3\u30c1\u3057\u306a\u3044\u306e\u3067\u3001\u8fd4\u5024\u304c-1\uff08\u30de\u30c3\u30c1\u306a\u3057\u306e\u610f\u5473\uff09\u3067\u3057\u305f\u3002<\/p>\n<h2>\u5c0f\u6570\u70b9\u3001\u30ab\u30f3\u30de\u306a\u3069\u306e\u30c1\u30a7\u30c3\u30af\u65b9\u6cd5<\/h2>\n<p>\u6b63\u898f\u8868\u73fe\u3067\u6570\u5024\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u969b\u306b\u3001<br \/>\n<div class=\"box01\"><\/p>\n<ul>\n<li><b>\u5c0f\u6570\u70b9<\/b><\/li>\n<li><b>\u30ab\u30f3\u30de\u533a\u5207\u308a<\/b><\/li>\n<li><b>0\u59cb\u307e\u308a\u306e\u6570\u5b57<\/b><\/li>\n<li><b>+\u7b26\u53f7<\/b><\/li>\n<li><b>-\u7b26\u53f7<\/b><\/li>\n<\/ul>\n<p><\/div><br \/>\n\u3092\u8003\u616e\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u4ee5\u4e0a\u3092\u8003\u616e\u3057\u305f\u6b63\u898f\u8868\u73fe\u306f\u3001<\/p>\n<p>&#8216;^(+|-)?(0[1-9]{0,2}|d{0,3}*)(,d{3})*(.[0-9]+)?$&#8217;<\/p>\n<p>\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u4e0a\u306e\u6b63\u898f\u8868\u73fe\u306e\u5404\u90e8\u306e\u610f\u5473\u306f\u4ee5\u4e0b\u306e\u8868\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<table>\n<thead>\n<tr>\n<th>\u6b63\u898f\u8868\u73fe<\/th>\n<th>\u6b63\u898f\u8868\u73fe\u306e\u610f\u5473<\/th>\n<\/tr>\n<\/thead>\n<thead>\n<tr>\n<td>d{0,3}<\/td>\n<td>\u6570\u5b57\uff080\u6841\uff5e3\u6841\uff09<\/td>\n<\/tr>\n<tr>\n<td>(.[0-9]+)?<\/td>\n<td>\u5c0f\u6570\u70b9\u3064\u304d\u6570\u5b57<\/td>\n<\/tr>\n<tr>\n<td>(,d{3})*<\/td>\n<td>\u30ab\u30f3\u30de\u3064\u304d\u6570\u5b57\uff083\u6841\u305a\u3064\u9023\u7d9a\uff09<\/td>\n<\/tr>\n<tr>\n<td>0[1-9]{0,2}<\/td>\n<td>0\u3064\u304d\u6570\u5b57\uff081\u6841\uff5e3\u6841\uff09<\/td>\n<\/tr>\n<tr>\n<td>(+|-)?<\/td>\n<td>+\u7b26\u53f7\u3001-\u7b26\u53f7<\/td>\n<\/tr>\n<\/thead>\n<\/table>\n<p>\u305d\u308c\u3067\u306f\u3001\u5b9f\u969b\u306b\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:js decode:true \">window.onload = function () {\r\n    \/\/ \u5c0f\u6570\u70b9\u3001\u30ab\u30f3\u30de\u306a\u3069\u3092\u8003\u616e\u3057\u305f\u6570\u5024\u306e\u30c1\u30a7\u30c3\u30af\u65b9\u6cd5\r\n    var n01 = \"123,456.78\";\r\n    var n02 = \"012,456.78\";\r\n    var n03 = \"+123,456.78\";\r\n    var n04 = \"-123,456.78\";\r\n    var n05 = \"123,456.78abc\";\r\n    var n06 = \"0123,456.78\";\r\n\r\n    \/\/ \u4e0a\u8a18\u9805\u76ee\u3092\u8003\u616e\u3057\u305f\u6b63\u898f\u8868\u73fe\u306e\u751f\u6210\r\n    var regex = new RegExp('^(+|-)?(0[1-9]{0,2}|d{0,3})(,d{3})*(.[0-9]+)?$', 'g');\r\n\r\n\r\n    console.log('n01.search(regex) = ' + n01.search(regex));\r\n    console.log('n02.search(regex) = ' + n02.search(regex));\r\n    console.log('n03.search(regex) = ' + n03.search(regex));\r\n    console.log('n04.search(regex) = ' + n04.search(regex));\r\n    console.log('n05.search(regex) = ' + n05.search(regex));\r\n    console.log('n06.search(regex) = ' + n06.search(regex));\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 \">n01.search(regex) = 0\r\nn02.search(regex) = 0\r\nn03.search(regex) = 0\r\nn04.search(regex) = 0\r\nn05.search(regex) = -1\r\nn06.search(regex) = -1\r\n<\/pre>\n<p>\u5c0f\u6570\u70b9\u3001\u30ab\u30f3\u30de\u30010\u57cb\u3081\u3001+\u7b26\u53f7\u3001-\u7b26\u53f7\u304c\u6b63\u3057\u304f\u3064\u3044\u3066\u3044\u308b\u6570\u5b57\u3092\u8868\u3059\u6587\u5b57\u5217\u306f\u3001\u6b63\u898f\u8868\u73fe\u691c\u7d22\u306esearch()\u30e1\u30bd\u30c3\u30c9\u306e\u8fd4\u5024\u304c0\uff08\u6b63\u898f\u8868\u73fe\u304c\u6587\u5b57\u5217\u306e0\u6587\u5b57\u76ee\u304b\u3089\u3068\u4e00\u81f4\uff09\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u660e\u3089\u304b\u306b\u6570\u5b57\u3067\u306a\u3044\u5909\u6570n05\u3068\u30010\u57cb\u3081\u306e\u6570\u5b57\u304c4\u6841\u306b\u306a\u3063\u3066\u3044\u3066\u30ab\u30f3\u30de\u306e\u4f4d\u7f6e\u304c\u9055\u3063\u3066\u3057\u307e\u3063\u3066\u3044\u308b\u5909\u6570n06\u306f\u6b63\u898f\u8868\u73fe\u691c\u7d22\u306esearch()\u30e1\u30bd\u30c3\u30c9\u306e\u8fd4\u5024\u304c-1\uff08\u4e00\u81f4\u306a\u3057\uff09\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>\u5c0f\u6570\u70b9\u30fb\u30ab\u30f3\u30de\u5909\u63db\u5f8c\u306e\u30c1\u30a7\u30c3\u30af<\/h3>\n<p>\u5c0f\u6570\u70b9\u30fb\u30ab\u30f3\u30de\u533a\u5207\u308a\u306e\u6570\u5024\u306b\u95a2\u3057\u3066\u3001\u6b63\u898f\u8868\u73fe\u3067\u30c1\u30a7\u30c3\u30af\u3059\u308b\u65b9\u6cd5\u3092\u5b66\u7fd2\u3057\u307e\u3057\u305f\u304c\u3001\u5b9f\u8df5\u7684\u306a\u4f8b\u3068\u3057\u3066\u6570\u5024\u5909\u63db\u3057\u305f\u3042\u3068\u306b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u65b9\u6cd5\u3082\u8eab\u306b\u3064\u3051\u3066\u304a\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n<p>\u307e\u305a\u6700\u521d\u306b\u3001\u5148\u307b\u3069\u5b66\u7fd2\u3057\u305f\u6b63\u898f\u8868\u73fe\u3067\u306e\u30c1\u30a7\u30c3\u30af\u3092\u95a2\u6570\u5316\u3057\u3066\u3044\u3064\u3067\u3082\u4f7f\u3048\u308b\u3088\u3046\u306b\u3057\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true \">function check(target) {\r\n    var regex = new RegExp('^(+|-)?(0[1-9]{0,2}|d{0,3})(,d{3})*(.[0-9]+)?$', 'g');\r\n    \r\n    if( target.search( regex ) ) {\r\n        return true;\r\n    }\r\n    else {\r\n      return false;\r\n    }\r\n}<\/pre>\n<p>\u300ccheck()\u300d\u95a2\u6570\u3092\u65b0\u3057\u304f\u4f5c\u6210\u3057\u3001\u4e2d\u8eab\u306f\u5148\u307b\u3069\u5b66\u7fd2\u3057\u305f\u6b63\u898f\u8868\u73fe\u3092\u305d\u306e\u307e\u307e\u4ee3\u5165\u3057\u3066\u3044\u308b\u3060\u3051\u3067\u3059\u3002<\/p>\n<p>\u305f\u3060\u3057\u3001\u300csearch()\u300d\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u305f\u8fd4\u308a\u5024\u306f\u4f7f\u3044\u3084\u3059\u3044\u3088\u3046\u306b\u300ctrue \/ false\u300d\u3067\u8fd4\u3059\u3088\u3046\u306bIF\u6587\u3067\u6761\u4ef6\u5206\u5c90\u3055\u305b\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u6b21\u306b\u3001<b>\u3053\u306e\u95a2\u6570\u3092\u6d3b\u7528\u3057\u3066\u5c0f\u6570\u70b9\u3092\u30ab\u30f3\u30de\u533a\u5207\u308a\u306b\u5909\u63db\u3057\u305f\u5024\u304c\u3001\u6b63\u3057\u304f\u51e6\u7406\u3055\u308c\u305f\u304b\u3092\u30c1\u30a7\u30c3\u30af<\/b>\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n<pre class=\"lang:js decode:true \">var num = 1234567.890;\r\n\r\n\/\/\u30b0\u30ed\u30fc\u30d0\u30eb\u30d5\u30e9\u30b0\u300cg\u300d\u3092\u4ed8\u3051\u5fd8\u308c\u305f\u6b63\u898f\u8868\u73fe\u3092\u8a2d\u5b9a\r\nvar result = String(num).replace(\/(d)(?=(d{3})+(?!d))\/, \"$1,\");\r\n\r\nif( check(result) ) {\r\n\r\n    console.log('\u51e6\u7406\u304c\u6b63\u3057\u304f\u3042\u308a\u307e\u305b\u3093');\r\n\r\n}\r\nelse {\r\n\r\n    console.log('\u6b63\u3057\u304f\u51e6\u7406\u3055\u308c\u307e\u3057\u305f');\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 \">\u51e6\u7406\u304c\u6b63\u3057\u304f\u3042\u308a\u307e\u305b\u3093<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u300c1234567.890\u300d\u3068\u3044\u3046\u5c0f\u6570\u70b9\u306b\u6b63\u898f\u8868\u73fe\u3092\u4f7f\u3063\u3066\u30ab\u30f3\u30de\u533a\u5207\u308a\u3092\u633f\u5165\u3057\u3066\u3044\u308b\u306e\u3067\u3059\u304c\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u30d5\u30e9\u30b0\u3092\u4ed8\u3051\u5fd8\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u305d\u306e\u305f\u3081\u3001\u6700\u521d\u306b\u30de\u30c3\u30c1\u3057\u305f\u7b87\u6240\u3060\u3051\u30ab\u30f3\u30de\u533a\u5207\u308a\u304c\u633f\u5165\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u300c1,234567.89\u300d\u3068\u306a\u308a\u3001\u6b63\u3057\u304f\u51e6\u7406\u304c\u884c\u308f\u308c\u3066\u3044\u307e\u305b\u3093\u3002<\/p>\n<p>\u3053\u306e\u6642\u306b\u3001\u5148\u307b\u3069\u4f5c\u6210\u3057\u305f\u300ccheck()\u300d\u95a2\u6570\u3092\u4f7f\u3063\u3066\u6761\u4ef6\u5206\u5c90\u3055\u305b\u3066\u307f\u308b\u3068\u3001\u6b63\u3057\u304f\u51e6\u7406\u304c\u3055\u308c\u3066\u3044\u306a\u3044\u306e\u304c\u5b9f\u884c\u7d50\u679c\u3092\u898b\u3066\u3082\u5206\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n<h2>\u6570\u5024\u306e\u7bc4\u56f2\u30c1\u30a7\u30c3\u30af\u65b9\u6cd5<\/h2>\n<p>JavaScript\u3067\u6570\u5024\u306e\u7bc4\u56f2\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3046\u306b\u306f\u3001\u81ea\u5206\u3067\u5b9f\u88c5\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u307e\u305a\u306f\u3001\u5024\u304c\u6709\u9650\u306e\u7bc4\u56f2\u3067\u3042\u308b\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u30b3\u30fc\u30c9\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<br \/>\n\u306a\u304a\u3001\u7121\u9650\u5927\u3001\u7121\u9650\u5c0f\u306e\u30ea\u30c6\u30e9\u30eb\u306b\u3064\u3044\u3066\u306f\u3001\u4e0b\u8a18URL\u306e\u300c3 \u6570\u5024\u578b\u3067\u3055\u307e\u3056\u307e\u306a\u5024\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5\u300d\u306e\u7ae0\u3092\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<br \/>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/23408\" 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\/js_object-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">JavaScript\u3067Number\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4f7f\u3044\u65b9(\u30d7\u30ed\u30d1\u30c6\u30a3\u3001\u30e1\u30bd\u30c3\u30c9\u4e00\u89a7)<\/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<p>\u30b3\u30fc\u30c9\u306f\u3001if\u6587\u5185\u306e\u6761\u4ef6\u5f0f\u3067\u3001\u5909\u6570n\u304c\u6700\u5927\u5024\u3068\u6700\u5c0f\u5024\u306e\u7bc4\u56f2\u306b\u5165\u3063\u3066\u308b\u304b\u3069\u3046\u304b\u3092\u6bd4\u8f03\u6f14\u7b97\u5b50 &lt;\u3001&gt; \u3067\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true \">window.onload = function () {\r\n    \/\/ \u6570\u5024\u306e\u7bc4\u56f2\u30c1\u30a7\u30c3\u30af\u65b9\u6cd5\r\n    \/\/ \u53c2\u8003\u30b5\u30a4\u30c8\uff08\u6700\u5927\u5024\u3001\u6700\u5c0f\u5024\u306a\u3069\uff09\r\n    \/\/ https:\/\/www.sejuku.net\/blog\/23408\r\n    var n = 100;\r\n    if (n &gt; Number.NEGATIVE_INFINITY &amp;&amp; n &lt; Number.POSITIVE_INFINITY) {\r\n\r\n        console.log('n is valid.');\r\n\r\n    } else {\r\n\r\n        console.log('n is invalid.');\r\n\r\n    }\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 \">n is valid.\r\n<\/pre>\n<p>\u4ee5\u4e0a\u306e\u3088\u3046\u306b\u3001\u5909\u6570n\u306f\u6709\u9650\u306e\u6570\u5b57\u3067\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u4efb\u610f\u306e\u6700\u5927\u5024\u3001\u6700\u5c0f\u5024\u306e\u7bc4\u56f2\u5185\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u30b3\u30fc\u30c9\u3082\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u30b3\u30fc\u30c9\u306f\u3001if\u6587\u5185\u306e\u6761\u4ef6\u5f0f\u3067\u3001\u5909\u6570n\u304c\u6700\u5927\u5024\u3068\u6700\u5c0f\u5024\u306e\u7bc4\u56f2\u306b\u5165\u3063\u3066\u308b\u304b\u3069\u3046\u304b\u3092\u6bd4\u8f03\u6f14\u7b97\u5b50 &lt;=\u3001&gt;= \u3067\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true \">window.onload = function () {\r\n    \/\/ \u6570\u5024\u306e\u7bc4\u56f2\u30c1\u30a7\u30c3\u30af\u65b9\u6cd5\r\n    var n = 100;\r\n    var valid_min = 110;\r\n    var valid_max = 120;\r\n    if (n &gt;= valid_min &amp;&amp; n &lt;= valid_max) {\r\n\r\n        console.log('n is in valid number range.')\r\n\r\n    } else {\r\n\r\n        console.log('n is not in valid number range.')\r\n\r\n    }\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 \">n is not in valid number range.\r\n<\/pre>\n<p>\u4ee5\u4e0a\u306e\u3088\u3046\u306b\u3001\u5909\u6570n\uff08==100\uff09\u306f\u3001\u7bc4\u56f2110\uff5e120\u306e\u9593\u306b\u306f\u3042\u308a\u307e\u305b\u3093\u3067\u3057\u305f\u3002<\/p>\n<h2>\u5c0f\u6570\u70b9\u30fb\u30ab\u30f3\u30de\u3092\u6271\u3046\u65b9\u6cd5<\/h2>\n<h3>\u6570\u5024\u306e\u6841\u6570\u30c1\u30a7\u30c3\u30af\u65b9\u6cd5<\/h3>\n<p>\u6700\u5f8c\u306b\u3001\u6570\u5024\u306e\u6841\u6570\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u5b66\u7fd2\u3092\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n<p>\u307e\u305a\u6700\u521d\u306b\u3001JavaScript\u3067\u306f\u6841\u6570\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u306a\u3044\u306e\u3067\u3001\u81ea\u5206\u3067\u5b9f\u88c5\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u70b9\u306b\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u305d\u3053\u3067\u3001\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb\u4f8b\u3068\u3057\u3066\u6570\u5024\u306e\u6841\u6570\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u95a2\u6570\u3092\u6b21\u306e\u3088\u3046\u306b\u81ea\u4f5c\u3057\u3066\u307f\u307e\u3059\uff01<\/p>\n<pre class=\"lang:js decode:true \">function checkLength(num) {\r\n    var target = Math.abs(num);  \/\/\u7d76\u5bfe\u5024\u3092\u53d6\u5f97\r\n  \r\n    return target.toString().length;\r\n}\r\n\r\nconsole.log( checkLength(23425) );<\/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 \">5<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u4e0e\u3048\u3089\u308c\u305f\u6570\u5024\u3092\u6587\u5b57\u5217\u306b\u5909\u63db\u3057\u305f\u3046\u3048\u3067\u6587\u5b57\u6570\u3092\u6570\u3048\u308b\u3068\u3044\u3046\u51e6\u7406\u3092\u884c\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u3067\u6570\u5024\u306e\u6841\u6570\u304c\u6570\u3048\u3089\u308c\u308b\u308f\u3051\u3067\u3059\u304c\u3001\u30de\u30a4\u30ca\u30b9\u5024\u306e\u5834\u5408\u306b\u300c &#8211; \u300d\u3082\u542b\u3081\u3066\u6570\u3048\u3066\u3057\u307e\u3046\u305f\u3081\u3001Math.abs()\u3092\u4f7f\u3063\u3066\u7d76\u5bfe\u5024\u3092\u53d6\u5f97\u3059\u308b\u306e\u3092\u5fd8\u308c\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u4ed6\u306b\u3082\u3001\u6570\u5024\u306b\u304a\u3051\u308b\u6841\u533a\u5207\u308a\u3084\u6841\u6570\u306e\u6570\u3048\u65b9\u306e\u4e8b\u4f8b\u306b\u3064\u3044\u3066\u3001\u6b21\u306e\u8a18\u4e8b\u3067\u8a73\u3057\u304f\u30b3\u30fc\u30c9\u4f8b\u3068\u3068\u3082\u306b\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\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\/23408\" 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\/js_object-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">JavaScript\u3067Number\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4f7f\u3044\u65b9(\u30d7\u30ed\u30d1\u30c6\u30a3\u3001\u30e1\u30bd\u30c3\u30c9\u4e00\u89a7)<\/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>\u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u6841\u6570\u30c1\u30a7\u30c3\u30af\u65b9\u6cd5<\/h3>\n<p>\u6b21\u306b\u3001\u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u6841\u6570\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u65b9\u6cd5\u3082\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n<p>\u30dd\u30a4\u30f3\u30c8\u306f\u3001<b>\u5c0f\u6570\u70b9\u3067\u3042\u308b\u300c. (\u30c9\u30c3\u30c8)\u300d\u3092\u6d3b\u7528\u3057\u3066\u6570\u5024\u30922\u3064\u306b\u5206\u5272\u3059\u308b<\/b>\u3068\u3044\u3046\u70b9\u3067\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u300c123.45\u300d\u3068\u3044\u3046\u5c0f\u6570\u70b9\u304c\u3042\u3063\u305f\u5834\u5408\u306b\u3001\u300c123\u300d\u3068\u300c45\u300d\u306e2\u3064\u306b\u5206\u5272\u3059\u308c\u3070\u300c45\u300d\u304c2\u6841\u306e\u6570\u5024\u3067\u3042\u308b\u3053\u3068\u306f\u5148\u307b\u3069\u306e\u4f8b\u304b\u3089\u3082\u660e\u3089\u304b\u3067\u3059\u3088\u306d\u3002<\/p>\n<p>\u305d\u3053\u3067\u3001\u6b21\u306e\u3088\u3046\u306a\u30c1\u30a7\u30c3\u30af\u95a2\u6570\u3092\u81ea\u4f5c\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n<pre class=\"lang:js decode:true \">function check(num, target) {\r\n    var array = num.toString().split('.');  \/\/\u6570\u5024\u30922\u3064\u306b\u5206\u5272\u3059\u308b\r\n    var result  = 0;\r\n    \r\n    \/\/\u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u6841\u6570\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\r\n    if (array[1].length === target) {\r\n        return true;\r\n    }\r\n    else {\r\n        return false;\r\n    }\r\n};\r\n\r\nconsole.log( check(-123.4365, 4) );<\/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>\u3053\u306e\u4f8b\u3067\u306f\u3001\u6570\u5024\u3092\u6587\u5b57\u5217\u306b\u5909\u63db\u3057\u305f\u3042\u3068\u306b\u300csplit()\u300d\u3092\u4f7f\u3063\u3066\u300c. (\u30c9\u30c3\u30c8)\u300d\u306e\u524d\u5f8c\u30672\u3064\u306b\u5206\u5272\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u3067\u914d\u5217\u5316\u3055\u308c\u308b\u308f\u3051\u3067\u3059\u304c\u3001<b>1\u756a\u76ee\u306e\u8981\u7d20\u306b\u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u6570\u5024\u304c\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3001length\u3092\u4f7f\u3063\u3066\u6587\u5b57\u6570\u3092\u6570\u3048\u308c\u3070\u826f\u3044<\/b>\u308f\u3051\u3067\u3059\u3002<\/p>\n<p>\u4eca\u56de\u81ea\u4f5c\u3057\u305f\u300ccheck()\u300d\u95a2\u6570\u306f\u3001\u7b2c1\u5f15\u6570\u306b\u30c1\u30a7\u30c3\u30af\u3057\u305f\u3044\u5c0f\u6570\u70b9\u3092\u5f53\u3066\u306f\u3081\u3066\u3001\u7b2c2\u5f15\u6570\u306b\u6841\u6570\u3092\u6307\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u300ccheck(123.456, 3)\u300d\u3067\u3042\u308c\u3070\u3001\u300c123.456\u300d\u304c\u5c0f\u6570\u70b9\u4ee5\u4e0b3\u6841\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3068\u3044\u3046\u610f\u5473\u306b\u306a\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n<h3>\u6570\u5024\u5909\u63db\u5f8c\u306e\u6841\u6570\u30c1\u30a7\u30c3\u30af\u65b9\u6cd5<\/h3>\n<p>\u6700\u5f8c\u306b\u3001\u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u6841\u6570\u5909\u63db\u3092\u884c\u3063\u305f\u969b\u306b\u3001\u5148\u307b\u3069\u81ea\u4f5c\u3057\u305f\u95a2\u6570\u3092\u4f7f\u3063\u3066\u30c1\u30a7\u30c3\u30af\u3059\u308b\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n<p>JavaScript\u3067\u306f\u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u6841\u6570\u5909\u63db\u306b\u300ctoFixed()\u300d\u3092\u4f7f\u3046\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\u3002<\/p>\n<p>\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n<pre class=\"lang:js decode:true \">var num = 12.3456;\r\nvar result = num.toFixed(2);\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 \">12.35<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u300ctoFixed(2)\u300d\u3068\u3059\u308b\u3053\u3068\u3067\u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u6841\u6570\u30922\u6841\u306b\u6307\u5b9a\u3067\u304d\u3066\u3044\u308b\u306e\u304c\u5b9f\u884c\u7d50\u679c\u304b\u3089\u3082\u78ba\u8a8d\u3067\u304d\u307e\u3059\u306d\u3002<\/p>\n<p>\u305d\u3053\u3067\u3001\u5148\u307b\u3069\u81ea\u4f5c\u3057\u305f\u95a2\u6570\u3092\u4f7f\u3063\u3066\u6b63\u3057\u304f\u51e6\u7406\u304c\u3055\u308c\u3066\u3044\u308b\u306e\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n<pre class=\"lang:js decode:true \">var num = 12.3456;\r\nvar digit = 2;  \/\/\u6841\u6570\r\n\r\nvar result = num.toFixed( digit );\r\n\r\nconsole.log( check(result, digit) );<\/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>\u3053\u306e\u4f8b\u3067\u306f\u3001\u6307\u5b9a\u306e\u6841\u6570\u3092\u300cdigit\u300d\u306b\u4ee3\u5165\u3057\u3001toFixed()\u95a2\u6570\u3067\u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u6841\u6570\u5909\u63db\u3092\u884c\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u305d\u306e\u5f8c\u306b\u3001check()\u95a2\u6570\u3092\u4f7f\u3044\u76ee\u7684\u306e\u6841\u6570\u306b\u6b63\u3057\u304f\u5909\u63db\u3055\u308c\u305f\u3053\u3068\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u308b\u306e\u304c\u5b9f\u884c\u7d50\u679c\u304b\u3089\u3082\u78ba\u8a8d\u3067\u304d\u307e\u3059\u306d\u3002<\/p>\n<p>\u6570\u5024\u3084\u5c0f\u6570\u70b9\u306e\u6841\u6570\u5909\u63db\u306f\u4e00\u822c\u7684\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u3082\u3088\u304f\u51fa\u3066\u304f\u308b\u306e\u3067\u3001\u3053\u306e\u3088\u3046\u306a\u30c1\u30a7\u30c3\u30af\u65b9\u6cd5\u3092\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u3044\u304b\u304c\u3067\u3057\u305f\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p>\u7c21\u5358\u306b\u5909\u6570\u5024\u304c\u6570\u5024\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3059\u308b\u306e\u306f\u3001isNaN()\u3084isFinite()\u3092\u4f7f\u3046\u65b9\u304c\u4fbf\u5229\u3067\u3057\u305f\u3002<\/p>\n<p>\u307e\u305f\u3001\u6587\u5b57\u5217\u304c\u6570\u5024\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3059\u308b\u306e\u306f\u3001\u6b63\u898f\u8868\u73fe\u3092\u7528\u3044\u308b\u3053\u3068\u304c\u9069\u5207\u3067\u3057\u305f\u3002<br \/>\n\u6587\u5b57\u5217\u3092\u6b63\u898f\u8868\u73fe\u3067\u30de\u30c3\u30c1\u3055\u305b\u308b\u51e6\u7406\u306f\u3088\u304f\u4f7f\u308f\u308c\u308b\u30b3\u30fc\u30c9\u306a\u306e\u3067\u3001\u305c\u3072\u3001\u3053\u3053\u3067\u4f7f\u3044\u65b9\u3092\u899a\u3048\u3066\u304a\u3044\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u307e\u305f\u3001\u6570\u5024\u306e\u7bc4\u56f2\u30c1\u30a7\u30c3\u30af\u3084\u6841\u6570\u30c1\u30a7\u30c3\u30af\u3092\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u81ea\u5206\u3067\u30b3\u30fc\u30c9\u3092\u5b9f\u88c5\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3057\u305f\u3002\u4e0d\u4fbf\u3068\u611f\u3058\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u81ea\u5206\u3067\u5b9f\u88c5\u3059\u308b\u5206\u81ea\u7531\u306b\u5fdc\u7528\u304c\u5229\u304d\u307e\u3059\u306e\u3067\u3001\u305c\u3072\u3001\u899a\u3048\u3066\u304a\u3044\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>JavaScript\u306e\u6570\u5024\u306e\u30c1\u30a7\u30c3\u30af\u306b\u3064\u3044\u3066\u5fd8\u308c\u3066\u3057\u307e\u3063\u305f\u3089\u3001\u307e\u305f\u3053\u306e\u30da\u30fc\u30b8\u3092\u3054\u89a7\u306b\u306a\u3063\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\uff01Web\u30b3\u30fc\u30c0\u30fc\u30fb\u30d7\u30ed\u30b0\u30e9\u30de\u30fc\u306e\u8c9d\u539f\uff08@touhicomu\uff09\u3067\u3059\u3002 \u4eca\u65e5\u306f\u3001JavaScript\u306e\u6570\u5024\u306e\u30c1\u30a7\u30c3\u30af\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002 \u6570\u5024\u306e\u30c1\u30a7\u30c3\u30af\u65b9\u6cd5\u3092\u8003\u3048\u3066\u307f\u308b\u3068\u3001 \u5909\u6570\u304c\u6570\u5024\u304b\u3069\u3046\u304b\u30c1\u30a7\u30c3\u30af [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":61561,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"swell_btn_cv_data":"","footnotes":""},"categories":[2346],"tags":[95,713,714,712],"class_list":["post-23884","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript-study","tag-javascript","tag-713","tag-714","tag-712"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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