验证项目是实数还是整数 支持的平台:视窗和 Mac OS 签名(numberp item)
返回值类型:T 或零 T如果项目计算结果为实数或整数;否则。nil 例子(setq a 123 b 'a) A (numberp 4) T (numberp 3.8348) T (numberp "Howdy") nil (numberp a) T (numberp b) nil (numberp (eval b)) T |
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