CSS动画模态框弹出如何实现_通过CSS animation和opacity/transform控制模态框显示动画

<div class="modal" id="myModal">
  <div class="modal-content">
    <p>这是模态框内容</p>
    <button onclick="closeModal()">关闭</button>
  </div>
</div>

.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  pointer-events: none; /* 点击穿透 */
  transition: opacity 0.3s ease;
}
<p>.modal-content {
background: white;
padding: 20px;
border-radius: 8px;
box-shadow: 0 4px 12px rgba(0,0,0,0.2);
transform: scale(0.8);
transition: transform 0.3s ease;
}</p>

@keyframes fadeInScale {
  from {
    opacity: 0;
    transform: scale(0.8);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.modal.active {
  opacity: 1;
  pointer-events: auto;
  animation: fadeInScale 0.3s forwards;
}
</font>

function openModal() {
  document.getElementById('myModal').classList.add('active');
}
<p>function closeModal() {
document.getElementById('myModal').classList.remove('active');
}</p>

const modal = document.getElementById('myModal');
<p>function closeModal() {
modal.classList.remove('active');
// 动画结束后再隐藏
modal.addEventListener('animationend', () => {
if (!modal.classList.contains('active')) {
modal.style.display = 'none';
}
}, { once: true });
}</p><p>// 打开时恢复显示
function openModal() {
modal.style.display = 'flex';
setTimeout(() => modal.classList.add('active'), 10);
}</p>