如何使用javascript/css灰显父div和兄弟div

<div class="parent">
  <div class="sibling">Sibling Div</div>
  <div class="sibling">Sibling Div</div>
</div>

.parent {
  position: relative; /* 设置相对定位，为了给子元素创建遮罩 */
}

.sibling {
  position: relative;
  background-color: #f2f2f2; /* 设置兄弟div的灰色背景 */
}

.sibling.grayed {
  position: absolute; /* 设置绝对定位，遮罩在兄弟div之上 */
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5); /* 设置遮罩的灰色透明度 */
  z-index: 9999; /* 设置遮罩的层级，确保覆盖兄弟div */
}

function grayOutSiblingDivs() {
  var siblingDivs = document.getElementsByClassName('sibling');
  for (var i = 0; i < siblingDivs.length; i++) {
    siblingDivs[i].classList.add('grayed');
  }
}

function restoreSiblingDivs() {
  var siblingDivs = document.getElementsByClassName('sibling');
  for (var i = 0; i < siblingDivs.length; i++) {
    siblingDivs[i].classList.remove('grayed');
  }
}