带边框/周长作为加载器的按钮？

<button id="loader-btn" class="loader-btn">Submit</button>

.loader-btn {
  position: relative;
}

.loader-btn::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 20px;
  height: 20px;
  border: 2px solid #000;
  border-radius: 50%;
  border-top-color: transparent;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% {
    transform: translate(-50%, -50%) rotate(0deg);
  }
  100% {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}

const loaderBtn = document.getElementById('loader-btn');
loaderBtn.addEventListener('click', () => {
  loaderBtn.classList.add('loading');
  // Perform your async task here
});