展开div的关闭按钮

<button id="toggleButton">展开/关闭</button>
<div id="content" style="display: none;">
  这是要展开/关闭的内容。
</div>

#content {
  border: 1px solid #ccc;
  padding: 10px;
}

var toggleButton = document.getElementById("toggleButton");
var content = document.getElementById("content");

toggleButton.addEventListener("click", function() {
  if (content.style.display === "none") {
    content.style.display = "block";
  } else {
    content.style.display = "none";
  }
});