cpf.js

function randomiza(n) {
    return Math.round(Math.random()*n);
}

function mod(dividendo,divisor) {
    return Math.round(dividendo - (Math.floor(dividendo/divisor)*divisor));
}

function gerarCPF(comPontos) {
    var n = 9;
    var n1 = randomiza(n);
    var n2 = randomiza(n);
    var n3 = randomiza(n);
    var n4 = randomiza(n);
    var n5 = randomiza(n);
    var n6 = randomiza(n);
    var n7 = randomiza(n);
    var n8 = randomiza(n);
    var n9 = randomiza(n);

    var d1 = n9*2+n8*3+n7*4+n6*5+n5*6+n4*7+n3*8+n2*9+n1*10;
    d1 = 11 - ( mod(d1,11) );
    if (d1>=10) d1 = 0;

    var d2 = d1*2+n9*3+n8*4+n7*5+n6*6+n5*7+n4*8+n3*9+n2*10+n1*11;
    d2 = 11 - ( mod(d2,11) );
    if (d2>=10) d2 = 0;

    var cpf;

    if (comPontos) cpf = ''+n1+n2+n3+'.'+n4+n5+n6+'.'+n7+n8+n9+'-'+d1+d2;
    else cpf = ''+n1+n2+n3+n4+n5+n6+n7+n8+n9+d1+d2;

    return cpf;
}