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<!DOCTYPE html> <html> <body> <h1>JavaScript Numbers</h1> <h2>The Number.isNaN() Method</h2> <p>Number.isNaN() returns true if a value is NaN and of datatype Number, otherwise false.</p> <p id="demo"></p> <p>Number.isNaN() is not supported in Internet Explorer.</p> <script> let result = "Is 123 NaN? " + Number.isNaN(123) + "<br>" + "Is -123 NaN? " + Number.isNaN(-1.23) + "<br>" + "Is '123' NaN? " + Number.isNaN('123') + "<br>" + "Is 0/0 NaN? " + Number.isNaN(0 / 0); document.getElementById("demo").innerHTML = result; </script> </body> </html>
