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Validar rut chileno con javascript

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Función para validar rut chileno en javascript

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  1. function validarut(ruti,dvi){
  2.  var rut = ruti+"-"+dvi;
  3.  if (rut.length<9)
  4.      return(false)
  5.   i1=rut.indexOf("-");
  6.   dv=rut.substr(i1+1);
  7.   dv=dv.toUpperCase();
  8.   nu=rut.substr(0,i1);
  9.  
  10.   cnt=0;
  11.   suma=0;
  12.   for (i=nu.length-1; i>=0; i--)
  13.   {
  14.     dig=nu.substr(i,1);
  15.     fc=cnt+2;
  16.     suma += parseInt(dig)*fc;
  17.     cnt=(cnt+1) % 6;
  18.    }
  19.   dvok=11-(suma%11);
  20.   if (dvok==11) dvokstr="0";
  21.   if (dvok==10) dvokstr="K";
  22.   if ((dvok!=11) && (dvok!=10)) dvokstr=""+dvok;
  23.  
  24.   if (dvokstr==dv)
  25.      return(true);
  26.   else
  27.      return(false);
  28. }

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