How do you check that a number is NaN in JavaScript?

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伪装坚强ぢ
伪装坚强ぢ 2020-11-22 06:19

I’ve only been trying it in Firefox’s JavaScript console, but neither of the following statements return true:

parseFloat(\'geoff\') == NaN;

parseFloat(\'ge         


        
30条回答
  •  悲&欢浪女
    2020-11-22 06:46

    I use underscore's isNaN function because in JavaScript:

    isNaN(undefined) 
    -> true
    

    At the least, be aware of that gotcha.

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