Validar “testar” CPF JavaScript

<script>
function TestaCPF(strCPF) {
var Soma;
var Resto;
Soma = 0;
if (strCPF == “00000000000”) return false;
for (i=1; i<=9; i++) Soma = Soma + parseInt(strCPF.substring(i-1, i)) * (11 – i);
Resto = (Soma * 10) % 11;
if ((Resto == 10) || (Resto == 11)) Resto = 0;
if (Resto != parseInt(strCPF.substring(9, 10)) ) return false;
Soma = 0;
for (i = 1; i <= 10; i++) Soma = Soma + parseInt(strCPF.substring(i-1, i)) * (12 – i);
Resto = (Soma * 10) % 11;
if ((Resto == 10) || (Resto == 11)) Resto = 0;
if (Resto != parseInt(strCPF.substring(10, 11) ) ) return false;
return true;
}
var strCPF = “12345678909”;
alert(TestaCPF(strCPF));
</script>