js 隐藏某个元素的高度

document.getElementById('elementId').style.height = '0';
document.getElementById('elementId').style.overflow = 'hidden';

function animateHeight(element, targetHeight) {
  let currentHeight = element.offsetHeight;
  const step = (targetHeight - currentHeight) / 10;
  
  function stepHeight() {
    currentHeight += step;
    element.style.height = currentHeight + 'px';
    if ((step < 0 && currentHeight > targetHeight) || (step > 0 && currentHeight < targetHeight)) {
      requestAnimationFrame(stepHeight);
    } else {
      element.style.height = targetHeight + 'px';
    }
  }
  
  requestAnimationFrame(stepHeight);
}

// 使用示例
animateHeight(document.getElementById('elementId'), 0);