JS代码实现输入密码访问页面

    <script type="text/javascript">
    function password() {   
    var testV = 1;   
    var pass1 = prompt(’请输入密码’,’’);   
    while (testV < 3) {   
    if (!pass1)   
    history.go(-1);   
    if (pass1 == "密码") {
    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>

    <script type="text/javascript">   
    function password() {   
    var testV = 1;   
    var pass1 = prompt(’Sorry,该页不允许用户浏览,请输入密码:’,’’);   
    while (testV < 3) {   
    if (!pass1)    
    history.go(-1);   
    if (pass1 == "密码") {
    alert(’一看你就是自己人，口令正确!’);   
    window.location.href="http://www.qqiyu.cn";//修改需要密码认证的网页   
    break;   
    }    
    testV+=1;   
    var pass1 =    
    prompt(’哥们，密码不对！:(’,’’);   
    }   
    if (pass1!="password" & testV ==3)    
    history.go(-1);   
    return " ";   
    }    
    document.write(password());   
    </script>

    <script type="text/javascript">   
    loopy()   
    function loopy() {   
    var sWord =""  
    while (sWord != "密码") {
    sWord = prompt("输入正确密码才能登陆!")   
    }   
    alert("密码正确！")   
    }   
    </script>