<!doctype html>
<!--小小鱼儿小小林-->
<html>
    <head>




<body>
<script language="javascript">
<!--
loopy();
function loopy() {
var sWord = prompt("输入正确密码才能登陆!","");
var password = "123456789";
var isCancle = false;
while(sWord!=password){
 if(sWord==null){
  isCancle = true;
  break;
 }else{
  sWord = prompt("输入正确密码才能登陆!","");
 }
}
if(!isCancle){
 alert("密码正确谢谢你的光临！");
}else{
 location.replace("about:blank");
 window.close();
}
}
//-->
</script>


</body>
</html>

直接复制代码即可使用