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- ejemplo:
- tecla tiempo resultado
- a 3seg a
- function valida_longitud () {
- let permitido = 0;
- let areaTexto = document.getElementById("texto");
- if (areaTexto.value.length != permitido) {
- areaTexto.value = "";
- }
- <textarea id="texto" value="" onKeyDown="valida_longitud()"></textarea>
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