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<html><body><h1>JavaScript Numbers</h1><h2>The Number.isFinite() Method</h2><p>Number.isFinite() returns true if the value is a finite, legal number:</p><p id="demo"></p><script>let res = "";res += Number.isFinite(+1.23) + ": +1.23<br>";res += Number.isFinite(-1.23) + ": -1.23<br>";res += Number.isFinite('2005/12/12') + ": '2005/12/12'<br>";document.getElementById("demo").innerHTML = res;</script></body></html>