{"id":1194,"date":"2023-02-11T20:44:42","date_gmt":"2023-02-11T11:44:42","guid":{"rendered":"http:\/\/attacktube.com\/?p=1194"},"modified":"2023-11-12T21:04:30","modified_gmt":"2023-11-12T12:04:30","slug":"%e3%80%90javascript%e3%80%91%e6%95%b0%e5%80%a4%e3%81%8b%e5%88%a4%e5%ae%9a%e3%81%99%e3%82%8bisnumber%e9%96%a2%e6%95%b0","status":"publish","type":"post","link":"http:\/\/attacktube.com\/?p=1194","title":{"rendered":"\u3010JavaScript\u3011\u6570\u5024\u304b\u5224\u5b9a\u3059\u308bisNumber\u95a2\u6570"},"content":{"rendered":"\n<p>\u5165\u529b\u3057\u305f\u5024\u304c\u6570\u5024\u304b\u6570\u5024\u4ee5\u5916\u304b\u3092\u5224\u5b9a\u3059\u308b\u305f\u3081\u306bisNumber\u95a2\u6570\u3092\u4f7f\u3046\u3002<br>typeof\u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u3066number\u306a\u3089\u6570\u5024\u3068\u5224\u5b9a\u3067\u304d\u308b\u3002\u3057\u304b\u3057\u3001Infinity\u3068-Infinity\u306ftypeof\u6f14\u7b97\u5b50\u3092\u4f7f\u3046\u3068number\u3068\u5224\u5b9a\u3055\u308c\u3066\u3057\u307e\u3046\u3002isNumber\u95a2\u6570\u3067\u306fInfinity\u3068-Infinity\u3092false\u3068\u5224\u5b9a\u3059\u308b\u3002<br>\u3053\u306e\u305f\u3081\u3001Infinity\u3068-Infinity\u3092\u6570\u5024\u3068\u5224\u65ad\u3057\u305f\u304f\u306a\u3044\u5834\u5408\u306fisNumber\u95a2\u6570\u3092\u4f7f\u3046\u3002<br><\/p>\n\n\n\n<p>\u7a7a\u6587\u5b57\u3001Infinity\u3001-Infinity\u3001\u6587\u5b57\u52170\u3001null\u306e\u5834\u5408\u3001isNumber\u95a2\u6570\u306ffalse\u306b\u306a\u308b\u3002<br>\u6570\u50240\u306e\u5834\u5408\u3001isNumber\u95a2\u6570\u306ftrue\u306b\u306a\u308b\u3002<\/p>\n\n\n\n<!--more-->\n\n\n\n<pre><code>\n\n\/\/\u6570\u5024\u304b\u5224\u5b9a\u3059\u308b\nconst isNumber = function(value) {\n    return typeof value === 'number' &amp;&amp; isFinite(value);\n};\n\nlet test = '';\n\nconsole.log(\"------------\");\n\nconsole.log(\"\u7a7a\u6587\u5b57\u306e\u5834\u5408\");\nconsole.log(\"isFinite(test) = \" + isFinite(test));\nconsole.log(\"typeof test = \" + typeof test);\nconsole.log(\"isNumber(test) = \" + isNumber(test));\n\ntest = Infinity;\nconsole.log(\"Infinity\u306e\u5834\u5408\");\nconsole.log(\"isFinite(test) = \" + isFinite(test));\nconsole.log(\"typeof test = \" + typeof test);\nconsole.log(\"isNumber(test) = \" + isNumber(test));\n\ntest = -Infinity;\nconsole.log(\"-Infinity\u306e\u5834\u5408\");\nconsole.log(\"isFinite(test) = \" + isFinite(test));\nconsole.log(\"typeof test = \" + typeof test);\nconsole.log(\"isNumber(test) = \" + isNumber(test));\n\ntest = 0;\nconsole.log(\"\u6570\u50240\u306e\u5834\u5408\");\nconsole.log(\"isFinite(test) = \" + isFinite(test));\nconsole.log(\"typeof test = \" + typeof test);\nconsole.log(\"isNumber(test) = \" + isNumber(test));\n\ntest = '0';\nconsole.log(\"\u6587\u5b57\u5217\u306e0\u306e\u5834\u5408\");\nconsole.log(\"isFinite(test) = \" + isFinite(test));\nconsole.log(\"typeof test = \" + typeof test);\nconsole.log(\"isNumber(test) = \" + isNumber(test));\n\ntest = null;\nconsole.log(\"null\u306e\u5834\u5408\");\nconsole.log(\"isFinite(test) = \" + isFinite(test));\nconsole.log(\"typeof test = \" + typeof test);\nconsole.log(\"isNumber(test) = \" + isNumber(test));\n\nconsole.log(\"------------\");\n\n\/*\n\n\u7a7a\u6587\u5b57\u306e\u5834\u5408\nisFinite(test) = true\ntypeof test = string\nisNumber(test) = false\nInfinity\u306e\u5834\u5408\nisFinite(test) = false\ntypeof test = number\nisNumber(test) = false\n-Infinity\u306e\u5834\u5408\nisFinite(test) = false\ntypeof test = number\nisNumber(test) = false\n\u6570\u50240\u306e\u5834\u5408\nisFinite(test) = true\ntypeof test = number\nisNumber(test) = true\n\u6587\u5b57\u5217\u306e0\u306e\u5834\u5408\nisFinite(test) = true\ntypeof test = string\nisNumber(test) = false\nnull\u306e\u5834\u5408\nisFinite(test) = true\ntypeof test = object\nisNumber(test) = false\n\n*\/\n\n<\/code><\/pre>\n\n\n\n<br>\n<script async=\"\" src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-3461056110605997\" crossorigin=\"anonymous\"><\/script>\n<ins class=\"adsbygoogle\" style=\"display:block; 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