How to check whether entered value is NaN in JavaScript?

1.	How to check whether entered value is NaN in JavaScript?
Answer» To detect a mobile device, LET’s say Android device, USE the navigator.userAgent.match. Here, we have set it in a function: Android: function() { RETURN navigator.userAgent.match(/Android/i); }, For IOS: iOS: function() { return navigator.userAgent.match(/iPhone\|iPad/i); },

Answer»

To detect a mobile device, LET’s say Android device, USE the navigator.userAgent.match. Here, we have set it in a function:

Android: function() { RETURN navigator.userAgent.match(/Android/i); },

For IOS:

iOS: function() { return navigator.userAgent.match(/iPhone|iPad/i); },

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