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