値が整数かチェックする - Qiitafunction isInteger(x) { return Math.round(x) === x; } > isInteger(1) true > isInteger(0) true > isInteger(1.111) false > isInteger("1") false > isInteger("") false > isInteger(null) false > isInteger(NaN) false > isInteger(undefined) false Register as a new user and use Qiita more conveniently You get articles that match your needsYou can efficiently read back useful informationYou can use dark th
