It seems that there is:
https://jsperf.com/isnan-performance/2 <https://jsperf.com/isnan-performance/2>

I did not see much difference between methods in terms of performance.

> On Aug 3, 2017, at 4:30 PM, Harbs <harbs.li...@gmail.com> wrote:
> 
> I wonder if there’s a difference between Flash and JS.

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