Vi metto la pagina così capite meglio
<html>
<head>
<meta charset="UTF-8" />
<script>
var boh = prompt("Come ti chiami?");
document.write("<font size='18' style='position: absolute; left: 350px'>Benvenuto "+boh+"</font>");
// Prova
function frasiRandom(){
var frasi = new Array();
frasi [0] = 'A';
frasi [1] = 'B';
frasi [2] = 'C';
frasi [3] = 'D';
var random = Math.floor(Math.random()*frasi.length);
document.Form.Input.value = frasi[random];
}
var lettera = new Array();
lettera [0] = "A";
lettera [1] = "a";
function scrive(){
if(document.Sbagliato.InputOne.value == lettera){
document.Sbagliato.inputtwo.value = "OK";
// document.write("OK");
} else{
document.Sbagliato.inputtwo.value = "Sbagliato";
}
}
</script>
<style>
.InPut {
width: 200px;
height: 60px
}
</style>
</head>
<body OnLoad="frasiRandom()">
<form name="Form">
<input type='button' value="Next" OnClick="frasiRandom()">
<input name="Input" class="InPut" readonly>
</form>
<form name="Sbagliato">
<input type="text" name="InputOne" value="" autocomplete="off">
<input type="button" OnClick="scrive()" name="SbagliatoOne" value="Valuta">
<input type="text" readonly name="inputtwo" value="">
</form>
</body>
</html>
<html>
<head>
<meta charset="UTF-8" />
<script>
var boh = prompt("Come ti chiami?");
document.write("<font size='18' style='position: absolute; left: 350px'>Benvenuto "+boh+"</font>");
// Prova
function frasiRandom(){
var frasi = new Array();
frasi [0] = 'A';
frasi [1] = 'B';
frasi [2] = 'C';
frasi [3] = 'D';
var random = Math.floor(Math.random()*frasi.length);
document.Form.Input.value = frasi[random];
}
var lettera = new Array();
lettera [0] = "A";
lettera [1] = "a";
function scrive(){
if(document.Sbagliato.InputOne.value == lettera){
document.Sbagliato.inputtwo.value = "OK";
// document.write("OK");
} else{
document.Sbagliato.inputtwo.value = "Sbagliato";
}
}
</script>
<style>
.InPut {
width: 200px;
height: 60px
}
</style>
</head>
<body OnLoad="frasiRandom()">
<form name="Form">
<input type='button' value="Next" OnClick="frasiRandom()">
<input name="Input" class="InPut" readonly>
</form>
<form name="Sbagliato">
<input type="text" name="InputOne" value="" autocomplete="off">
<input type="button" OnClick="scrive()" name="SbagliatoOne" value="Valuta">
<input type="text" readonly name="inputtwo" value="">
</form>
</body>
</html>