Function isNaN

  • isNaN(value): boolean

  • 判断一个值是否为NaN

    Parameters

    • value: unknown

    Returns boolean

    Since

    v3.1.2

    Example

    isNaN(NaN) // true
    isNaN(undefined) // false
    isNaN(1) // false
    isNaN('1') // false
    isNaN(new Number(NaN)) // true

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