生成按钮重叠div

<button id="generateButton">生成按钮</button>
<div class="overlapDiv">重叠的div 1</div>
<div class="overlapDiv">重叠的div 2</div>
<div class="overlapDiv">重叠的div 3</div>

#generateButton {
  width: 100px;
  height: 30px;
  background-color: #007bff;
  color: #fff;
}

.overlapDiv {
  width: 200px;
  height: 200px;
  background-color: #f8f9fa;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1;
  display: none;
}

var generateButton = document.getElementById("generateButton");
var overlapDivs = document.getElementsByClassName("overlapDiv");

generateButton.addEventListener("click", function() {
  for (var i = 0; i < overlapDivs.length; i++) {
    overlapDivs[i].style.display = "block";
  }
});