Web Storage - sessionStorage | login.js

function checkLoginStatus(page){
    username = sessionStorage.getItem("username");
    if (page == 'login') {
        if (username) {
            window.location.href = "dashboard.html";
        }
    }else if (page == 'dashboard') {
        if (!username) {
            window.location.href = "login.html";
        }else{
            $('#username').text(username);
        }
    }else{
        window.location.href = "login.html";
    }
}

function login(){
    var username = $('#username').val();
    var password = $('#password').val();

    if(password != '12341234'){
        alert('Password Wrong!!!');
    }else if(username != 'admin'){
        alert('Username not exist!!!');
    }else if (username == 'admin' && password == '12341234') {
        sessionStorage.setItem("username", "admin");
        window.location.href = "dashboard.html";
    }
}

function logout(){
    sessionStorage.removeItem("username");
    window.location.href = "login.html";
}