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<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>