[JAVASCRIPT] CONVERT VALUE STRING TO FLOAT JAVASCRIPT

$("input#valor").keyup(function(){
    var data = $(this).val();
    var res = data.replace("R$ ", "");
    if(res.length >= 7){
        var b = res.replace(".","");
        var a = b.replace(",",".");
    }else{
        a = res.replace(",",".");
    }
    console.log(a);
});