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<!DOCTYPE html> <html> <body> <h1>JavaScript Global Methods</h1> <h2>The isNaN() Method</h2> <p>isNaN() returns true if a value is NaN:</p> <p id="demo"></p> <script> let result = "Is '123' NaN? " + isNaN('123') + "<br>" + "Is 'Hello' NaN? " + isNaN('Hello') + "<br>" + "Is '2005/12/12' NaN? " + isNaN('2005/12/12'); document.getElementById("demo").innerHTML = result; </script> </body> </html>
