Use the parseFloat() method in JavaScript to return a floating point number after parsing a string.
Example
You can try to run the following code to learn how to work with parseFloat() method in JavaScript.
<!DOCTYPE html>
<html>
<body>
<script>
var val1 = parseFloat("2");
var val2 = parseFloat("30 minutes");
document.write(val1);
document.write("<br>"+val2);
</script>
</body>
</html>