Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    //******* devolver valor numérico mesmo que tenha px
    function GetSizeNumber(val) {
        var rval=0
        var wval="" + val
        var ix=wval.indexOf("px")
        if (ix > -1) {
                rval=Number(wval.substr(0,ix))
        } else {
                ix=wval.indexOf("pt")
                if (ix > -1) {
                        rval=Number(wval.substr(0,ix))
                } else {
                        rval=Number(wval)
                        if (isNaN(rval)) rval=0
                }
        }
        return rval
    }
    
    //******* devolver valor numérico mesmo que tenha px
    function GetSizeNumber2(val) {
        return parseInt(val)
    }
  };
</script>

Test runner

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GetSizeNumber("23px")
GetSizeNumber("23pt")
GetSizeNumber("23")

GetSizeNumber2("23px")
GetSizeNumber2("23pt")
GetSizeNumber2("23")

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