HTML, CSS, JS 实现弹窗 Loading 效果 - 简单易用

.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 9999;
}

.loader {
  border: 16px solid #f3f3f3;
  border-top: 16px solid #3498db;
  border-radius: 50%;
  width: 120px;
  height: 120px;
  animation: spin 2s linear infinite;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

//显示loading弹窗
function showLoading() {
  document.querySelector('.overlay').style.display = 'block';
}

//隐藏loading弹窗
function hideLoading() {
  document.querySelector('.overlay').style.display = 'none';
}