创建带有按钮的弹出窗口

<div id="popup-container">
  <div id="popup-content">
    <!-- 弹出窗口的内容 -->
    <h2>弹出窗口标题</h2>
    <p>这是弹出窗口的内容。</p>
    <button id="close-button">关闭</button>
  </div>
</div>

#popup-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
}

#popup-content {
  background-color: #fff;
  padding: 20px;
  border-radius: 5px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

#close-button {
  background-color: #ccc;
  border: none;
  padding: 10px 20px;
  border-radius: 5px;
  cursor: pointer;
}

var popupContainer = document.getElementById("popup-container");
var closeButton = document.getElementById("close-button");

closeButton.addEventListener("click", function() {
  popupContainer.style.display = "none";
});

// 显示弹出窗口
function showPopup() {
  popupContainer.style.display = "flex";
}

// 隐藏弹出窗口
function hidePopup() {
  popupContainer.style.display = "none";
}