instanceofã¨ã‹===ã¨ã‹typeofã¨ã‹ã‚’ã¾ã¨ã‚ã‚‹ - ç´ äººãŒãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã‚’勉強ã—ã¦ã„ãŸãƒ–ãƒã‚°JavaScriptã¯ã€typeof nullãŒ"object"ã ã£ãŸã‚Šã€typeof new String("foo")ãŒ"object"ã ã£ãŸã‚Šã€"foo" instanceof StringãŒfalseã ã£ãŸã‚Šã™ã‚‹ã€‚ ãªã®ã§ã€ãれらをã¾ã¨ã‚ã¦ä¸‹ã®ã‚ˆã†ãªé–¢æ•°ã«ã—ã¦ã€ãƒ“ットマスクを使ã£ã¦ç›®çš„ã®åž‹ã‹ã©ã†ã‹ã‚’確èªã§ãるよã†ã«ã™ã‚‹ã€‚ var Type = { OBJECT: 0x01, ARRAY: 0x02, STRING: 0x04, FUNCTION: 0x08, NUMBER: 0x10, BOOLEAN: 0x20, UNDEFINED: 0x40, NULL: 0x80, getType: function getType(object) { var ret = 0x00; if (object instanceof Object) ret |= 0x01; if (object
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