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<html><body><h1>JavaScript Numbers</h1><h2>The Number.isInteger() Method</h2><p>Number.isInteger() returns true if the value is an integer of the datatype Number:</p><p id="demo"></p><p>Number.isInteger() is not supported in Internet Explorer 11 and earlier.</p><script>let result ="Is 123 an integer? " + Number.isInteger(123) + "<br>" +"Is 123 an integer? " + Number.isInteger(-123) + "<br>" +"Is '123' an integer? " + Number.isInteger('123');document.getElementById("demo").innerHTML = result;</script></body></html>