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solo letras js

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//Función que permite solo Números
function ValidaSoloNumeros() {
 if ((event.keyCode < 48) || (event.keyCode > 57)) 
  event.returnValue = false;
}
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solo letras js

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function txNombres() {
 if ((event.keyCode != 32) && (event.keyCode < 65) || (event.keyCode > 90) && (event.keyCode < 97) || (event.keyCode > 122))
  event.returnValue = false;
}
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