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<!DOCTYPE html> <html> <body> <h1>JavaScript Numbers</h1> <h2>The Number.isNaN() Method</h2> <p>Number.isNaN() returns true if the value is Number.NaN (Not a Number), otherwise false.</p> <p id="demo"></p> <script> let result = "Is 5-2 NaN? " + Number.isNaN(5 - 2) + "<br>" + "Is 0 NaN? " + Number.isNaN(0) + "<br>" + "Is 'Hello' NaN? " + Number.isNaN('Hello') + "<br>" + "Is '2005/12/12\ NaN? " + Number.isNaN('2005/12/12') + "<br>" + "Is ' ' NaN? " + Number.isNaN(''); document.getElementById("demo").innerHTML = result; </script> </body> <!-- /jsref/tryit.asp?filename=tryjsref_isnan_number1 Thu, 06 Feb 2025 18:35:44 GMT --> </html>
