codice:
<html>
<head>
<title>Conta Lettere</title>
<script>
var a, b, c, d, e, f, g, h, k, i, l, j, m, n, o, p, q, r, s, t, u, x, v, w, y, z;
var ar= new Array("a","b","c","d","e","f","g","h","k","i","l","j","m","n","o","p","q","r","s","t","u","x","v","w","y","z");
function contami(lett) {
var scritto= document.leggi.lettera.value;
var lett= scritto.charAt(scritto.length-1);
if (lett == "a") a= a+1;
else if (lett == "b") b= b+1;
else if (lett == "c") c= c+1;
else if (lett == "d") d= d+1;
else if (lett == "e") e= e+1;
else if (lett == "f") f= f+1;
else if (lett == "g") g= g+1;
else if (lett == "h") h= h+1;
else if (lett == "k") k= k+1;
else if (lett == "i") i= i+1;
else if (lett == "l") l= l+1;
else if (lett == "j") j= j+1;
else if (lett == "m") m= m+1;
else if (lett == "n") n= n+1;
else if (lett == "o") o= o+1;
else if (lett == "p") p= p+1;
else if (lett == "q") q= q+1;
else if (lett == "r") r= r+1;
else if (lett == "s") s= s+1;
else if (lett == "t") t= t+1;
else if (lett == "u") u= u+1;
else if (lett == "x") x= x+1;
else if (lett == "v") v= v+1;
else if (lett == "w") w= w+1;
else if (lett == "y") y= y+1;
else if (lett == "z") z= z+1;
}
function resetta() {
document.leggi.lettera.value= "";
a= 0, b= 0, c= 0, d= 0, e= 0, f= 0, g= 0, h= 0, k= 0, i= 0, l= 0, j= 0, m= 0, n= 0, o= 0, p= 0, q= 0, r= 0, s= 0, t= 0, u= 0, x= 0, v= 0, w= 0, y= 0, z= 0;
}
function conta() {
if (a > 0) document.write("A= "+a+" - ");
if (b > 0) document.write("B= "+b+" - ");
if (c > 0) document.write("C= "+c+" - ");
if (d > 0) document.write("D= "+d+" - ");
if (e > 0) document.write("E= "+e+" - ");
if (f > 0) document.write("F= "+f+" - ");
if (g > 0) document.write("G= "+g+" - ");
if (h > 0) document.write("H= "+h+" - ");
if (k > 0) document.write("K= "+k+" - ");
if (i > 0) document.write("I= "+i+" - ");
if (l > 0) document.write("L= "+l+" - ");
if (m > 0) document.write("M= "+m+" - ");
if (n > 0) document.write("N= "+n+" - ");
if (o > 0) document.write("O= "+o+" - ");
if (p > 0) document.write("P= "+p+" - ");
if (q > 0) document.write("Q= "+q+" - ");
if (r > 0) document.write("R= "+r+" - ");
if (s > 0) document.write("S= "+s+" - ");
if (t > 0) document.write("T= "+t+" - ");
if (u > 0) document.write("U= "+u+" - ");
if (x > 0) document.write("X= "+x+" - ");
if (v > 0) document.write("V= "+v+" - ");
if (w > 0) document.write("W= "+w+" - ");
if (y> 0) document.write("Y= "+y+" - ");
if (z> 0) document.write("Z= "+z+" - ");
document.write('
TORNA INDIETRO');
}
</script>
</head>
<body>
<center>
<form name="leggi">
<input size="50" name="lettera" value="Scrivi Qui, senza immettere le maiuscole!" onclick="Javascript: resetta();" onkeyup="Javascript: contami(this.value);"></input>
</form>
CLICCA QUI PER SAPERE QUANTE LETTERE HAI IMMESSO E QUALI
</body>
</html>
