Initial commit

JS/index.js

+document.addEventListener("DOMContentLoaded", () => {
+    let authLoginInputVal = "";
+    let authPasswordInputVal = "";
+    let regisLoginInputVal = "";
+    let regisPasswordInputVal = "";
+    let regisPasswordVerifyInputVal = "";
+
+    const changeHandler = (event) => {
+        switch (event.target.className) {
+            case "authLogin":
+                authLoginInputVal = event.target.value;
+                break;
+            case "authPassword":
+                authPasswordInputVal = event.target.value;
+                break;
+            case "regisLogin":
+                regisLoginInputVal = event.target.value;
+                break;
+            case "regisPassword":
+                regisPasswordInputVal = event.target.value;
+                break;            
+            case "regisVerifyPassword":
+                regisPasswordVerifyInputVal = event.target.value;
+                break;
+            default:
+                break;
+        };
+    };
+
+    const clickHandler = (event) => {
+        if(event.target.className === "spanCreate") {
+            formLogin.style.display = "none";
+            formRegister.style.display = "flex";
+        } else {
+            formLogin.style.display = "flex";
+            formRegister.style.display = "none";
+        };
+    };
+
+    const formLogin = document.getElementById("form_login");
+    const authLoginInput = formLogin.children[1];
+    const authPasswordInput = formLogin.children[2];
+    const authSpan = formLogin.children[4];
+
+    const formRegister = document.getElementById("register_form");
+    const regisLoginInput = formRegister.children[1];
+    const regisPasswordInput = formRegister.children[2];
+    const regisPasswordVerifyInput = formRegister.children[3];
+    const regisSpan = formRegister.children[5];
+
+    authLoginInput.addEventListener("keydown", changeHandler);
+    authPasswordInput.addEventListener("keydown", changeHandler);
+    regisLoginInput.addEventListener("keydown", changeHandler);
+    regisPasswordInput.addEventListener("keydown", changeHandler);
+    regisPasswordVerifyInput.addEventListener("keydown", changeHandler);
+
+    authSpan.addEventListener("click", clickHandler);
+    regisSpan.addEventListener("click", clickHandler);
+
+    formLogin.addEventListener("submit", (event) => {
+        event.preventDefault();
+
+        if(!authLoginInputVal || !authPasswordInputVal) {
+            alert("Заполните все поля!");
+        } else {
+            const storageLogin = localStorage.getItem("login");
+
+            if(authLoginInputVal === storageLogin) {
+                alert(`Добро пожаловать! ${authLoginInputVal}`);
+            } else {
+                alert("Пользователь с таким логином не найден.")
+            };
+        };
+    });
+
+    formRegister.addEventListener("submit", (event) => {
+        event.preventDefault();
+
+        if(!regisLoginInputVal || !regisPasswordInputVal || !regisPasswordVerifyInputVal) {
+            alert("Заполните все поля!");
+        } else {
+            console.log(regisPasswordVerifyInputVal, regisPasswordInputVal);
+            if(regisPasswordInputVal === regisPasswordVerifyInputVal) {
+                alert(`Добро пожаловать! ${regisLoginInputVal}`);
+                localStorage.setItem("login", regisLoginInputVal);
+            } else {
+                alert("Пароль не совпадает");
+            };
+        };
+    });
+});
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Styles/style.css

+* {
+    box-sizing: border-box;
+}
+
+.container {
+    width: 1200px;
+    margin: 0 auto;
+    display: flex;
+    justify-content: center;
+}
+
+.form {
+    border: 1px solid gray;
+    border-radius: 15px;
+    padding: 15px 25px;
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: space-around;
+    background-color: bisque;
+    height: 300px;
+    width: 300px;
+}
+
+.form input, button {
+    width: 90%;
+    height: 35px;
+    border-radius: 5px;
+}
+
+.form span {
+    cursor: pointer;
+}
+
+.form span:hover {
+    color: cadetblue;
+}
+
+#register_form {
+    display: none;
+}
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index.html

+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <link rel="stylesheet" href="./Styles/style.css">
+    <script src="./JS/index.js"></script>
+    <title>Document</title>
+</head>
+<body>
+    <div class="container">
+        <form class="form" id="form_login">
+            <h1>Авторизация</h1>
+            <input class="authLogin" type="text" placeholder="Логин">
+            <input class="authPassword" type="password" placeholder="Пароль">
+            <button type="submit">Войти</button>
+            <span class="spanCreate">Нет аккаунта? Создать...</span>
+        </form>
+        <form class="form" id="register_form">
+            <h1>Регистрация</h1>
+            <input class="regisLogin" type="text" placeholder="Логин">
+            <input class="regisPassword" type="password" placeholder="Пароль">
+            <input class="regisVerifyPassword" type="password" placeholder="Повторно введите пароль">
+            <button type="submit">Регистрация</button>
+            <span class="spanLogin">Уже есть аккаунта? Войти...</span>
+        </form>
+    </div>
+</body>
+</html>
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