sidebar

html：
    <a href="#" class="btn">点我啊</a>
    <div class="sidebar is_hidden">
        原生侧边栏
    </div>


css:
.btn {
    position: fixed;
    right: 100px;
    top: 200px;
    font-size: 30px;
    padding: 3px;
    background-color: #ff102c;
    text-decoration: none;
}

.sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    width: 300px;
    background-color: black;
    text-align: center;
    color: #ff102c;
    font-size: 30px;
    transition: transform 0.5s ease-out;
}
.sidebar.is_hidden {
    transform: translateX(-300px);
}


JavaScript:

const  btn = document.querySelector(‘.btn‘);
const sidebar = document.querySelector(‘.sidebar‘);

btn.addEventListener(‘click‘,function () {
    sidebar.classList.toggle(‘is_hidden‘);
})