How can i continue while cycle?

Question

The user is typing his/her password until it would be correct. When user want to click "Cancel" we ask "Are you sure?" and if the answer is no, then again ask for the password.

I tried to use to strat again but it does not work =(

var password = "username",
    user_password        ,
    checked = true       ,
    user_password = prompt("Enter your password"),
    checked_confirm      ;

label: while(checked){
    if(user_password == password){
        alert("You are successfully logged in");
        break;
    }
    else if(user_password == null){
        checked_confirm =  confirm("Are you sure you want to cancel authorization?");
        if(checked_confirm){
            alert("You have canceled authorization");
            break;
        }
        else{
            continue lable;
        }
    }
    else{
        user_password = prompt("Enter your password");
    }
}

Answer 1

Ask for the password at the start of the loop, and don't break `till you get it:

var password = "username",
  user_password,
  checked_confirm;

while (true) {
  user_password = prompt("Enter your password");

  if (user_password == password) {
    alert("You are successfully logged in");
    break;
  } else if (user_password == null) {
    checked_confirm = confirm("Are you sure you want to cancel authorization?");
    if (checked_confirm) {
      alert("You have canceled authorization");
      break;
    }
  } else {
    alert("Wrong password");
  }
}