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脚本说明：
把如下代码加入<body>区域中:
<SCRIPT LANGUAGE="JavaScript">
function password() {
var testV = 1;
var pass1 = prompt('请输入密码(密码是welcome):','');
while (testV < 3) {
if (!pass1)
history.go(-1);
if (pass1 == "welcome") {
alert('密码正确!');
break;
}
testV+=1;
var pass1 =
prompt('密码错误!请重新输入:');
}
if (pass1!="password" & testV ==3)
history.go(-1);
return " ";
}
document.write(password());
</SCRIPT>
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