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<html><body><h1>JavaScript Numbers</h1><h2>The Number.isNaN() Method</h2><p>Is "Hello" NaN?</p><p id="demo"></p><p>Number.isNaN() is not supported in Internet Explorer 11 or earlier.</p><script>let text = "Hello";document.getElementById("demo").innerHTML = Number.isNaN(text);</script></body><!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_isnan_number3 by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 17:39:09 GMT --></html>