| <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n \u578b\u306b\u306f\u672c\u5f53\u306b\u8272\u3005\u306a\u7a2e\u985e\u304c\u3042\u308a\u307e\u3059\u3002
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Infitity = ' + (typeof Infinity) );\r\n\r\n \/\/ String\r\n console.log( 'typeof "" = ' + (typeof "") );\r\n console.log( 'typeof "abc" = ' + (typeof "abc") );\r\n console.log( 'typeof "123" = ' + (typeof "123") );\r\n console.log( 'typeof (typeof 0) = ' + (typeof (typeof 0)) );\r\n\r\n \/\/ Boolean\r\n console.log( 'typeof true = ' + (typeof true) );\r\n console.log( 'typeof false = ' + (typeof false) );\r\n\r\n \/\/ Undefined\r\n console.log( 'typeof undefined = ' + (typeof undefined) );\r\n}\r\n<\/pre>\n\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n \r\n\/\/ Number\r\ntypeof 1 = number\r\ntypeof 1.41 = number\r\ntypeof Math.PI = number\r\ntypeof Infitity = number\r\n\r\n\/\/ String\r\ntypeof "" = string\r\ntypeof "abc" = string\r\ntypeof "123" = string\r\ntypeof (typeof 0) = string\r\n\r\n\/\/ Boolean\r\ntypeof true = boolean\r\ntypeof false = boolean\r\n\r\n\/\/ Undefined\r\ntypeof undefined = undefined\r\n<\/pre>\n\u4ee5\u4e0a\u306e\u3088\u3046\u306b\u3001\u7d44\u307f\u8fbc\u307f\u578b\u306b\u5bfe\u3057\u3066\u3001typeof\u306f\u6b63\u3057\u304f\u52d5\u4f5c\u3057\u3066\u3044\u308b\u3088\u3046\u3067\u3059\u306d\u3002<\/p>\n \u307e\u305f\u3001\u300ctypeof (typeof 0) = string\u300d\u3068\u306a\u3063\u3066\u3044\u308b\u3088\u3046\u306b\u3001typeof\u306e\u8fd4\u308a\u5024\u306fstring\u578b\u3067\u3042\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n \u95a2\u6570\u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u578b\u306e\u5834\u5408<\/h3>\n\u6b21\u306f\u3001\u95a2\u6570\u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5bfe\u3059\u308btypeof\u306e\u7d50\u679c\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n \r\nwindow.onload = function () {\r\n \/\/ Function\r\n console.log( 'typeof function () { } = ' + (typeof function () { }) );\r\n console.log( 'typeof class abc { } = ' + (typeof class abc { }) );\r\n console.log( 'typeof Math.abs = ' + (typeof Math.abs) );\r\n\r\n \/\/ Object\r\n console.log( 'typeof { prop: 1 } =' + (typeof { prop: 1 }) );\r\n\r\n \/\/ null\u306fObject\u578b\u3067\u3059\u3002\r\n console.log( 'typeof null = ' + (typeof null) );\r\n\r\n \/\/ Date()\u3084String()\u306e\u30e9\u30c3\u30d1\u30fc\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306fObject\u3068\u5224\u5b9a\u3055\u308c\u307e\u3059\u3002\r\n console.log( 'typeof new String("abc") = ' + (typeof new String("abc")) );\r\n\r\n \/\/ Array \u306f Object\u3068\u5224\u5b9a\u3055\u308c\u307e\u3059\u3002\r\n console.log( 'typeof [1, 2, 3] = ' + (typeof [1, 2, 3]) );\r\n\r\n \/\/ Array.isArray \u3084 Object.prototype.toString.call \u306a\u3069\u3067\r\n \/\/ \u666e\u901a\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u914d\u5217\u3092\u533a\u5225\u3067\u304d\u307e\u3059\u3002\r\n console.log( 'Array.isArray({ prop: 1 }) = ' + (Array.isArray({ prop: 1 })) );\r\n console.log( 'Array.isArray([1, 2, 3]) = ' + Array.isArray([1, 2, 3]) 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true\r\n<\/pre>\n\u95a2\u6570\u3084\u30af\u30e9\u30b9\u3001Math\u306e\u7d44\u307f\u8fbc\u307f\u95a2\u6570\u306a\u3069\u306f\u3001"function"\u3068\u5224\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u306d\u3002<\/p>\n \u307e\u305f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f"object"\u3068\u6b63\u3057\u304f\u5224\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u914d\u5217\u3084\u30e9\u30c3\u30d1\u30fc\u30af\u30e9\u30b9\u3082\u201dobject\u201d\u3068\u5224\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n \u30e9\u30c3\u30d1\u30fc\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u3001\u7d44\u307f\u8fbc\u307f\u578b\u3092\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u5316\u3057\u305f\u3082\u306e\u3067\u3059\u306e\u3067\u3001"object"\u3068\u5224\u5b9a\u3055\u308c\u3066\u3057\u307e\u3046\u306e\u3067\u3059\u3002
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\n\u3053\u306e\u5224\u65ad\u306btypeof\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n null\u304b\u3069\u3046\u304b\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b===\u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u3066\u76f4\u63a5null\u304b\u3092\u5224\u65ad\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u305f\u3002<\/p>\n \u305d\u308c\u4ee5\u5916\u306e\u5834\u5408\u306fprototype\u540d\u3092\u53d6\u5f97\u3057\u3001\u305d\u306e\u4e2d\u304b\u3089\u6b63\u898f\u8868\u73fe\u306b\u3066\u30af\u30e9\u30b9\u540d\u3092\u629c\u304d\u51fa\u3057\u3066\u3044\u307e\u3059\u3002
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