js弹出漂亮的div窗口

在JavaScript中，你可以使用DOM操作来创建一个漂亮的div窗口，并使用CSS来美化它。以下是一个简单的示例，展示了如何创建一个带有标题栏和关闭按钮的弹出窗口。

HTML结构

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>弹出窗口示例</title>
<style>
  /* 弹出窗口样式 */
  .popup {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 300px;
    background-color: white;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    z-index: 1000;
  }
  .popup-header {
    padding: 10px;
    background-color: #f1f1f1;
    border-bottom: 1px solid #ddd;
    cursor: move;
  }
  .popup-content {
    padding: 20px;
  }
  .popup-close {
    float: right;
    font-size: 20px;
    cursor: pointer;
  }
  .overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 999;
  }
</style>
</head>
<body>

<button onclick="openPopup()">打开弹窗</button>

<div id="popup" class="popup">
  <div class="popup-header">
    弹出窗口标题
    <span class="popup-close">&times;</span>
  </div>
  <div class="popup-content">
    这里是弹出窗口的内容。
  </div>
</div>

<div id="overlay" class="overlay"></div>

<script>
function openPopup() {
  document.getElementById('popup').style.display = 'block';
  document.getElementById('overlay').style.display = 'block';
}

document.querySelector('.popup-close').addEventListener('click', function() {
  document.getElementById('popup').style.display = 'none';
  document.getElementById('overlay').style.display = 'none';
});

// 可选：使标题栏可拖动
var popupHeader = document.querySelector('.popup-header');
var popup = document.getElementById('popup');
var offsetX, offsetY;

popupHeader.addEventListener('mousedown', function(e) {
  offsetX = e.clientX - popup.offsetLeft;
  offsetY = e.clientY - popup.offsetTop;
  document.addEventListener('mousemove', dragPopup);
  document.addEventListener('mouseup', stopDragging);
});

function dragPopup(e) {
  popup.style.left = (e.clientX - offsetX) + 'px';
  popup.style.top = (e.clientY - offsetY) + 'px';
}

function stopDragging() {
  document.removeEventListener('mousemove', dragPopup);
  document.removeEventListener('mouseup', stopDragging);
}
</script>

</body>
</html>