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자바스크립트 isFinite()

숫자가 유한한지 확인:

let result = isFinite(123);
let result = isFinite("123");

정의 및 사용

값 이 유한 숫자인 경우 isFinite()메서드가 반환 됩니다.true

무한(유한 아님) 값은 Infinity, -Infinity또는NaN


isFinite()와 Number.isFinite()의 차이점

isFinite() 이 유한 숫자인 true경우 반환 합니다.

Number.isFinite()숫자 가 유한 숫자인 true경우 반환 합니다.

다시 말해:

isFinite()테스트하기 전에 값을 숫자로 변환합니다.

// This returns true
isFinite(123)
// This returns false
Number.isFinite("123")

통사론

isFinite(value)

매개변수

Parameter Description
value Required.
The value to be tested.

반환 값

유형 설명
참이나 거짓.false값이 Infinity, -Infinity 또는 NaN인 경우.
그렇지 않으면 true.


더 많은 예

숫자가 유한한지 확인:

isFinite(-1.23);
isFinite(5-2);
isFinite(0);
isFinite("Hello");
isFinite("2005/12/12");

브라우저 지원

isFinite() ECMAScript1(ES1) 기능입니다.

ES1(JavaScript 1997)은 모든 브라우저에서 완벽하게 지원됩니다.

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