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<!DOCTYPE html> <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>
