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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 0/0 NaN? " + isNaN(0/0) + "<br>" + "Is ' ' NaN? " + isNaN(' ') + "<br>" + "Is 'A' NaN? " + isNaN('A') + "<br>" + "Is true NaN? " + isNaN(true) + "<br>" + "Is false NaN? " + isNaN(false); document.getElementById("demo").innerHTML = result; </script> </body> </html>
