Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>The global JavaScript function parseFloat() converts strings to numbers:</p>

<p id="demo"></p>

<script>
document.getElementById("demo").innerHTML = 
    parseFloat("10") + "<br>" +
    parseFloat("10.33") + "<br>" +
    parseFloat("10 6") + "<br>" +    
    parseFloat("10 years") + "<br>" +
    parseFloat("years 10");        
</script>

</body>
</html>