<!DOCTYPE html>
<html>
<body>
<p>The isFinite() function returns false if the value is +infinity, -infinity, or NaN, otherwise it returns true.</p>
<p>Click the button to check whether a number is a finite, legal number.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var a = isFinite(123) + "<br>";
var b = isFinite(-1.23) + "<br>";
var c = isFinite(5-2) + "<br>";
var d = isFinite(0) + "<br>";
var e = isFinite("123") + "<br>";
var f = isFinite("Hello") + "<br>";
var g = isFinite("2005/12/12");
var res = a + b + c + d + e + f + g;
document.getElementById("demo").innerHTML = res;
}
</script>
</body>
</html>