<head>
<script>
function checkPass(){
var guess = document.myForm.pwdGuess.value;
var secret = document.myForm.hdnSecret.value;
if (guess == secret){
document.myForm.txtOutput.value = "You may proceed.";
} else {
document.myForm.txtOutput.value = "That is incorrect.";
}
}
</script>
</head>
<body>
<center>
<form name = "myForm">
<table>
<tr>
<td>Please enter password</td>
<td><input type = "password"
name = "pwdGuess">
</tr>
<tr>
<td colspan = 2><center>
<input type = "button"
value = "click me"
onClick = "checkPass()"></center>
</td>
</tr>
<tr>
<td colspan = 2>
<center>
<textArea name = "txtOutput"
rows = 1
cols = 35>
</textarea>
</center>
</td>
</tr>
</table>
<input type = "hidden"
name = "hdnSecret"
value = "JavaScript">
</form>
<hr>
</center>
</body>
</html>
【hidden_field】
