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Dos formas de invocar AJAX a través del método GET, en una o dos funciones saparadas

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// DOS FUNCIONES | METODO GET

function busca(){ //método GET
    var parametros = "funcion=busca";
    parametros+= "&dato=" + dato;
    parametros+= "&otro=" + otro;
    ajax = crearInstancia();   
    if(ajax){
                ajax.abort();
                 var url = "funciones/diario.php?" + parametros;
                ajax.onreadystatechange=eBusca;
                ajax.open("GET",url,true);       
                ajax.send(null);       
   }else{alert("No se pudo crear la instancia");}       
}

function eBusca(){//método GET
   if(ajax.readyState==4){
        if(ajax.status==200){
            resp= ajax.responseText;
            re = resp.replace(/\n/g, "");
            re = re.split("@@");
       }
    }
}

// UNA FUNCION | METODO GET

function busca(){ //método GET
    var parametros = "funcion=busca";
    parametros+= "&dato=" + dato;
    parametros+= "&otro=" + otro;
    ajax = crearInstancia();   
    if(ajax){

ajax.abort();
          var url = "funciones/diario.php?" + parametros;
          ajax.open("GET",url,true); 
          ajax.onreadystatechange = function() {
                if (ajax.readyState==1) { alert ("Cargando......."); } //OPCIONAL              

      if (ajax.readyState==4) && (ajax.status==200){

                 var resp = ajax.responseText;

     }// (ajax.readyState==4) && (ajax.status==200)

}// function()

ajax.setRequestHeader('Content-Type','application/x-www-form-urlencoded');

ajax.send(null);

return;
   }else{alert("No se pudo crear la instancia");}       
}

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