\u5b9f\u884c\u7d50\u679c\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
NaN\r\nNaN\r\nNaN\r\nNaN\r\n<\/pre>\n\u4e0a\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001\u5909\u6570res1\u306b\u30bc\u30ed\u540c\u58eb\u306e\u9664\u7b97\u306e\u7d50\u679c\u3001res2\u306b\u6574\u657010\u3068NaN\u5024\u306e\u8db3\u3057\u7b97\u306e\u7d50\u679c\u3001res3\u306bInfinity\u5024\u30920\u3067\u639b\u3051\u305f\u7d50\u679c\u3001res4\u306b\u30de\u30a4\u30ca\u30b93\u306e\u5e73\u65b9\u6839\u306e\u5024\u3092\u683c\u7d0d\u3057\u307e\u3057\u305f\u3002\u305d\u3057\u3066\u3001\u305d\u308c\u305e\u308c\u306e\u5909\u6570\u306e\u4e2d\u8eab\u3092console.log\u95a2\u6570\u3092\u7528\u3044\u3066\u8868\u793a\u3055\u305b\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n
\u3059\u308b\u3068\u3001\u3069\u308c\u3082NaN\u3068\u8868\u793a\u3055\u308c\u307e\u3057\u305f\u306d\u3002<\/p>\n
NaN\u306e\u57fa\u672c\u7684\u306a\u30d7\u30ed\u30d1\u30c6\u30a3<\/h3>\n
NaN\u306f\u5c11\u3057\u7279\u6b8a\u306a\u6027\u8cea\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u4e00\u3064\u76ee\u306f\u300cNaN\u5024\u3068\u6570\u5b57\u3068\u306e\u7b97\u8853\u7d50\u679c\u306f\u5168\u3066NaN\u3068\u306a\u308b<\/b>\u300d\u3068\u3044\u3046\u4e8b\u3067\u3059\u3002\u3053\u308c\u306f\u3001\u5148\u307b\u3069\u3082\u304a\u898b\u305b\u3057\u305f\u3088\u3046\u306b\u300110+NaN\u306a\u3069\u306e\u6f14\u7b97\u306f\u5168\u3066NaN\u3068\u3044\u3046\u7d50\u679c\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u305d\u3057\u3066\u4e8c\u3064\u76ee\u306f\u300cNaN\u5024\u3068\u306e\u6bd4\u8f03\u306f\u5168\u3066False\u3092\u8fd4\u3059<\/b>\u300d\u3068\u3044\u3046\u4e8b\u3067\u3059\u3002<\/p>\n
\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n
var res1 = 0\/0\r\nconsole.log(res1==NaN)\r\nconsole.log(res1<0)\r\nconsole.log(res1>0)\r\nconsole.log(res1==0)\r\nconsole.log(res1!=NaN)\r\n<\/pre>\n\u5b9f\u884c\u7d50\u679c\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
false\r\nfalse\r\nfalse\r\nfalse\r\ntrue\r\n<\/pre>\n\u4e0a\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001res1\u306b\u30bc\u30ed\u540c\u58eb\u306e\u9664\u7b97\u306e\u7d50\u679c\u3067\u3042\u308bNaN\u5024\u3092\u683c\u7d0d\u3057\u3001\u7b49\u5024\u6bd4\u8f03\u3084\u5927\u5c0f\u6bd4\u8f03\u3092\u884c\u3044\u307e\u3057\u305f\u3002NaN\u5024\u3092\u683c\u7d0d\u3059\u308bres1\u306fNaN\u3068\u7b49\u3057\u3044\u3068\u306f\u5224\u65ad\u3055\u308c\u305a\u3001\u30bc\u30ed\u3088\u308a\u5c0f\u3055\u3044\u3068\u3082\u5927\u304d\u3044\u3068\u3082\u3001\u30bc\u30ed\u306b\u7b49\u3057\u3044\u3068\u3082\u5224\u65ad\u3055\u308c\u307e\u305b\u3093\u3067\u3057\u305f\u3002<\/p>\n
\u552f\u4e00true\u3092\u8fd4\u3057\u305f\u6bd4\u8f03\u306f\u300cres1\u306fNaN\u3068\u306f\u7b49\u5024\u3067\u306f\u306a\u3044\u300d\u3068\u3044\u3046\u3001\u6700\u5f8c\u306e\u4e00\u884c\u3067\u3059\u3002<\/p>\n
NaN\u306e\u5224\u5b9a\u65b9\u6cd5<\/h2>\n
\u3067\u306f\u3001\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306fNaN\u304b\u3069\u3046\u304b\u3092\u8b58\u5225\u3059\u308b\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3044\u305f\u3057\u307e\u3059\u3002NaN\u306e\u5224\u5b9a\u306b\u304a\u3044\u3066\u306f\u3001\u4e3b\u306bisNaN\u95a2\u6570\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
\u300cisNaN()\u300d\u3067\u5224\u5b9a\u3059\u308b\u65b9\u6cd5<\/h3>\n
isNaN\u95a2\u6570\u3068\u306f\u5f15\u6570\u306b\u6307\u5b9a\u3057\u305f\u5024\u304cNaN\u3067\u3042\u308b\u304b\u78ba\u304b\u3081\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n
\u69cb\u6587\u306f\u3068\u3066\u3082\u30b7\u30f3\u30d7\u30eb\u3067<\/p>\n
isNaN(\u30c6\u30b9\u30c8\u3057\u305f\u3044\u5024) \r\n<\/pre>\n\u3068\u306a\u3063\u3066\u304a\u308a\u3001\u623b\u308a\u5024\u306ftrue\u304bfalse\u306e\u3069\u3061\u3089\u304b\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n
var res1 = 0\/0\r\nvar test1 = isNaN(res1)\r\nconsole.log(test1)\r\n<\/pre>\n\u5b9f\u884c\u7d50\u679c\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
true\r\n<\/pre>\n\u4e0a\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001NaN\u5024\u3092\u683c\u7d0d\u3059\u308bres1\u3092isNaN\u95a2\u6570\u306e\u5f15\u6570\u306b\u6307\u5b9a\u3057\u3066\u307f\u307e\u3057\u305f\u3002\u5b9f\u969b\u3001\u30bc\u30ed\u540c\u58eb\u306e\u9664\u7b97\u306fNaN\u3092\u8fd4\u3057\u305f\u306e\u3067\u3001true\u3068\u8868\u793a\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n
\u300cisNaN()\u300d\u306e\u554f\u984c\u70b9<\/h3>\n
\u3055\u3066\u3001isNaN()\u3092\u4f7f\u3046\u3068\u300cNaN\u300d\u3092\u5224\u5b9a\u3067\u304d\u308b\u308f\u3051\u3067\u3059\u304c\u3001\u5fc5\u305a\u3057\u3082NaN\u3060\u3051\u3092\u691c\u51fa\u3059\u308b\u3068\u3044\u3046\u610f\u5473\u3067\u306f\u306a\u3044\u306e\u3067\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002\u3069\u3046\u3044\u3046\u3053\u3068\u304b\u3068\u8a00\u3046\u3068\u3001isNaN()\u306fNaN\u306b\u306a\u308a\u5f97\u308b\u5024\u306f\u3059\u3079\u3066\u300ctrue\u300d\u5224\u5b9a\u3055\u308c\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n
\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u4f8b\u3092\u898b\u3066\u4e0b\u3055\u3044\uff01<\/p>\n
console.log(isNaN(0\/0));\r\nconsole.log(isNaN(NaN));\r\nconsole.log(isNaN(\"\u3053\u3093\u306b\u3061\u306f\"));\r\nconsole.log(isNaN(undefined));\r\n<\/pre>\n\u5b9f\u884c\u7d50\u679c<\/p>\n
true\r\ntrue\r\ntrue\r\ntrue\r\n<\/pre>\n\u300c0 \/ 0\u300d\u306f\u5148\u307b\u3069\u3082\u8a66\u3057\u3066NaN\u306b\u306a\u308b\u3053\u3068\u306f\u78ba\u8a8d\u3057\u307e\u3057\u305f\u306d\u3002<\/p>\n
\u307e\u305f\u3001\u300cNaN\u300d\u81ea\u4f53\u3092isNaN\u306e\u5f15\u6570\u306b\u5165\u308c\u3066\u3082\u5f53\u7136\u306a\u304c\u3089\u7d50\u679c\u306f\u300ctrue\u300d\u306b\u306a\u308a\u307e\u3059\u3002\u3068\u3053\u308d\u304c\u3001\u6587\u5b57\u5217\u3084undefined\u3092\u5f15\u6570\u306b\u5165\u308c\u3066\u3082\u300ctrue\u300d\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u304c\u5b9f\u884c\u7d50\u679c\u304b\u3089\u3082\u5206\u304b\u308a\u307e\u3059\u306d\u3002\u3053\u308c\u3089\u306e\u5024\u306f\u6570\u5024\u8a08\u7b97\u306b\u4f7f\u3046\u3068\u6700\u7d42\u7684\u306bNaN\u3068\u306a\u308b\u306e\u3067\u300ctrue\u300d\u306b\u306a\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n
\u3053\u306e\u3088\u3046\u306a\u3053\u3068\u304b\u3089\u3001\u5fc5\u305a\u3057\u3082NaN\u3092\u691c\u51fa\u3059\u308b\u7528\u9014\u306b\u300cisNaN()\u300d\u306f\u5229\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u306e\u3067\u3059\u3002<\/p>\n
\u300cNumber.isNaN()\u300d\u3067\u6b63\u78ba\u306b\u5224\u5b9a\u3059\u308b\u65b9\u6cd5<\/h3>\n
\u7c21\u5358\u306b\u300cNaN\u300d\u3092\u691c\u51fa\u3057\u305f\u3044\u5834\u5408\u306b\u306f\u3069\u3046\u3059\u308c\u3070\u826f\u3044\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n
\u5b9f\u306f\u3001\u65b0\u3057\u3044JavaScript\u306e\u4ed5\u69d8\u3067\u3042\u308bES2015\u3067\u306f\u3001Number\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u300cisNaN()\u300d\u304c\u8ffd\u52a0\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u3053\u308c\u3092\u4f7f\u3063\u3066\u3001\u5148\u307b\u3069\u3068\u540c\u3058\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n
console.log(Number.isNaN(0\/0));\r\nconsole.log(Number.isNaN(NaN));\r\nconsole.log(Number.isNaN(\"\u3053\u3093\u306b\u3061\u306f\"));\r\nconsole.log(Number.isNaN(undefined));\r\n<\/pre>\n\u5b9f\u884c\u7d50\u679c<\/p>\n
true\r\ntrue\r\nfalse\r\nfalse\r\n<\/pre>\n\u5b9f\u884c\u7d50\u679c\u306b\u6ce8\u76ee\u3057\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n
\u5f93\u6765\u306e\u300cisNaN()\u300d\u3060\u3068\u3059\u3079\u3066true\u5224\u5b9a\u3067\u3057\u305f\u304c\u4eca\u56de\u306f\u9055\u3044\u307e\u3059\u306d\u3002<\/p>\n
\u6587\u5b57\u5217\u3084undefined\u306a\u3069\u306e\u5024\u306f\u3057\u3063\u304b\u308a\u3068false\u5224\u5b9a\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3001NaN\u3092\u691c\u51fa\u3057\u305f\u3044\u5834\u5408\u306b\u306f\u6700\u9069\u306a\u65b9\u6cd5\u3068\u8a00\u3048\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n
\u305f\u3060\u3057\u3001IE\u306a\u3069\u4e00\u90e8\u306e\u30d6\u30e9\u30a6\u30b6\u306f\u5bfe\u5fdc\u3057\u3066\u3044\u306a\u3044\u306e\u3067\u3001\u3069\u3046\u3057\u3066\u3082\u3068\u8a00\u3046\u5834\u5408\u306b\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u95a2\u6570\u3092\u81ea\u4f5c\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\uff01<\/p>\n
function new_isNaN(value) {\r\n\r\n return typeof value === \"number\" && value !== value;\r\n\r\n}\r\n<\/pre>\n\u300cundefined\u300d\u300cnull\u300d\u306e\u9055\u3044\u306b\u3064\u3044\u3066<\/h2>\n
JavaScript\u306b\u306f\u300cNaN\u300d\u306e\u3088\u3046\u306b\u5358\u72ec\u3067\u610f\u5473\u304c\u3042\u308b\u5024\u304c\u4ed6\u306b\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u4f8b\u3048\u3070\u3001\u300cundefined\u300d\u300cnull\u300d\u3068\u3044\u3046\u5024\u306f\u3069\u306e\u3088\u3046\u306a\u610f\u5473\u304c\u3042\u308b\u306e\u3067\u3057\u3087\u3046\u304b\uff1f\u7c21\u5358\u306b\u8a00\u3046\u3068\u3001\u300cundefined\u300d\u306f\u672a\u5b9a\u7fa9\u3067\u300cnull\u300d\u306f\u7a7a\u3063\u307d\u3067\u3042\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u3066\u3044\u307e\u3059<\/b>\u3002<\/p>\n
\u6b21\u306e\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb\u4f8b\u3092\u898b\u3066\u4e0b\u3055\u3044\uff01<\/p>\n
var item;\r\n\r\nvar sample = null;\r\n<\/pre>\n\u5909\u6570\u300citem\u300d\u306f\u5024\u304c\u4f55\u3082\u683c\u7d0d\u3055\u308c\u3066\u306a\u3044\u3001\u3064\u307e\u308a\u4f55\u3082\u5b9a\u7fa9\u3055\u308c\u3066\u306a\u3044\u306e\u3067\u300cundefined\u300d\u306b\u306a\u308a\u307e\u3059\u3002\u5909\u6570\u300csample\u300d\u306b\u306f\u5024\u3068\u3057\u3066\u300cnull\u300d\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3001\u3053\u306e\u5909\u6570\u306e\u4e2d\u8eab\u306f\u7a7a\u3063\u307d\u3067\u3042\u308b\u3053\u3068\u304c\u660e\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u306d\u3002<\/p>\n
\u3053\u306e\u3088\u3046\u306b\u73fe\u5728\u306e\u72b6\u614b\u3092\u73fe\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u3053\u308c\u3089\u306e\u5024\u3092\u6d3b\u7528\u3059\u308c\u3070\u6761\u4ef6\u5206\u5c90\u306a\u3069\u3067\u51e6\u7406\u3092\u52b9\u7387\u5316\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u300cundefined \/ null\u300d\u3092\u4f7f\u3063\u305f\u6709\u52b9\u306a\u6d3b\u7528\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u3001\u6b21\u306e\u8a18\u4e8b\u3067\u8a73\u3057\u304f\u307e\u3068\u3081\u3066\u3044\u308b\u306e\u3067\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n \n \n
\n
\n
![](\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/08\/javascript-tutorial-top-150x86.png\")
\n <\/div>\n
\n
\u3010JavaScript\u5165\u9580\u3011undefined\u5fb9\u5e95\u89e3\u8aac\uff01\u4f7f\u3044\u65b9\u3084\u5224\u5b9a\u65b9\u6cd5\u307e\u3068\u3081<\/div>\n
\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/a>\n \n
\u307e\u3068\u3081<\/h2>\n
\u4eca\u56de\u306f\u3001JavaScript\u306b\u304a\u3051\u308b\u300cNaN\u300d\u3068\u3044\u3046\u7279\u5225\u306a\u5024\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002NaN\u306fJavaScript\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3044\u3066\u3001\u51fa\u73fe\u983b\u5ea6\u306e\u9ad8\u3044\u30ad\u30fc\u30ef\u30fc\u30c9\u306a\u306e\u3067\u899a\u3048\u3066\u304a\u3044\u3066\u640d\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n
\u7686\u3055\u3093\u3082\u3053\u306e\u8a18\u4e8b\u3092\u901a\u3057\u3066\u3001NaN\u306b\u3064\u3044\u3066\u306e\u77e5\u8b58\u3092\u6df1\u3081\u3066\u3044\u3063\u3066\u304f\u3060\u3055\u3044\u306d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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