سلام استاد جواب تمرین

var user = "visitor";
user = prompt("who is this");
var pass = "none";
if (user === "admin") {
    pass = prompt("password?");
}
else if(user != null) {
   alert("i don't know you");
}
if (pass === "master"){
   alert("welcome");
} 
else if(pass != "none") {
   alert("wrong pass");

}