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- <script>
- var letrasdni = "TRWAGMYFPDXBNJZSQVHLCKET";
- var dni = prompt();
- var resto = dni.substr(0,dni.length-1)%23;
- var letraDni = dni.substr(dni.length-1,1);
- var aux_letra;
- for(var i=0;i<letrasdni.length;i++){
- if(i == resto) {
- aux_letra=letrasdni[i];
- break;
- }
- }
- if(aux_letra == letraDni) alert('dni correcto.');
- else alert('dni incorrecto.');
- </script>
- <html>
- </html>
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