JavaScript data type (II)

JavaScript data type and the Number isNaN

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Number

• Number: integer and floating-point representation
• NaN: i.e. non-numerical (Not a Number) is a special value

Explanation

1. Any operation (e.g., NaN / 10) relates to the return NaN NaN
2. NaN is not equal to any value, including itself NaN

isNaN()

• Syntax: isNaN (n)
• Function: detecting whether the n "non-numerical"
• Return value: boolean
• Parameters: parameter n may be any type

Explanation

isNaN () value of the received, first try to convert a numerical value, and then detecting whether the non-numeric