var askName = prompt("What is your name?", '');

if (askName == "hovo") {
  var askPasswd = prompt("Type password", '');
  if (askPasswd == "shax") {
    alert("Hello Admin");
  }
  else if (askPasswd == null) {
    alert("Escape of password");
  }
  else {
    alert("Wrong Password");
  }
}
else if (askName == null) {
  alert("Escape of name");
}
else {
  alert("I don't know You");
}

var askName = prompt("What is Your Name?", '');
var askPasswd;
(askName == null) ? alert("Escape from name") :
  (askName != "hovo") ? alert("I don't know you") :
    (askPasswd = prompt("Type your login", '') == "shax") ? alert("Hello Admin") :
      (askPasswd == null) ? alert("Escape from password") : alert("Wrong Password");

(askPasswd = prompt("Type your login", '') == "shax")

((askPasswd = prompt("Type your login", '')) == "shax")

askPasswd = prompt("Type your login", '') == "shax"

console.log(false == null) // что выведет?

(askPasswd === null)