如何在Bootstrap 4加载页面后禁用加载器/旋转器？

<div id="loader" class="loader">
    <div class="spinner"></div>
</div>

.loader {
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    background: rgba(255, 255, 255, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
}

.spinner {
    border: 4px solid rgba(0, 0, 0, 0.1);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border-top-color: #000;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

window.addEventListener('load', function() {
    var loader = document.getElementById('loader');
    loader.style.display = 'none';
});