JavaScript实现拖动对话框效果的实现代码

网络编程 2024/12/23 佚名

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代码实现：

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    * {
      margin: 0;
      top: 0;
    }
    
    .login-btn {
      width: 50px;
      height: 50px;
      line-height: 50px;
      font-size: 16px;
      text-align: center;
      margin: 100px auto;
      background-color: #1E1E1E;
      color: white;
      border-radius: 50%;
    }
    
    .login-btn:hover {
      cursor: pointer;
      background-color: #323233;
      box-shadow: 3px 3px 10px rgba(0, 0, 0, .3);
    }
    
    .bg {
      display: none;
      width: 100%;
      height: 100%;
      position: fixed;
      top: 0;
      left: 0;
      background-color: rgba(0, 0, 0, .4);
    }
    
    .login {
      display: none;
      position: fixed;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 300px;
      height: 200px;
      background-color: #1E1E1E;
      box-shadow: 4px 4px 15px rgba(0, 0, 0, .3);
    }
    
    .hd {
      position: relative;
      width: 100%;
      height: 26px;
      background-color: #323233;
    }
    
    .hd:hover {
      cursor: move;
    }
    
    .close {
      position: absolute;
      top: 3px;
      right: 5px;
      width: 20px;
      height: 20px;
      background-color: red;
      text-align: center;
      line-height: 20px;
      border-radius: 50%;
      box-shadow: 0 0 5px rgba(0, 0, 0, .7) inset;
    }
    
    .close:hover {
      background-color: yellow;
      cursor: pointer;
    }
  </style>
</head>

<body>
  <div class="login-btn">点击</div>
  <div class="bg"></div>
  <div class="login">
    <div class="hd">
      <div class="close">×</div>
    </div>
  </div>
  <script>
    // 获取元素
    var btn = document.querySelector('.login-btn');
    var bg = document.querySelector('.bg');
    var login = document.querySelector('.login');
    var close = document.querySelector('.close');
    var hd = document.querySelector('.hd');

    // 按下btn，弹出对话框
    btn.addEventListener('click', function() {
      bg.style.display = 'block';
      login.style.display = 'block';
    });

    // 按下close，关闭对话框
    close.addEventListener('click', function() {
      bg.style.display = 'none';
      login.style.display = 'none';
    });

    hd.addEventListener('mousedown', function(e) {
      // 鼠标按下对话框顶部时，获取鼠标到对话框的距离
      var x = e.pageX - login.offsetLeft;
      var y = e.pageY - login.offsetTop;
      // 鼠标按下并移动时，实时更新对话框的位置
      document.addEventListener('mousemove', move);

      function move(e) {
        login.style.left = e.pageX - x + 'px';
        login.style.top = e.pageY - y + 'px';
      }
      // 鼠标松开时，移除拖拽的动作
      document.addEventListener('mouseup', function() {
        document.removeEventListener('mousemove', move);
      });
    });
  </script>
</body>

</html>

实现效果：

点击点击按钮，弹出对话框。
按住对话框顶部并移动，实现拖动效果。
点击对话框右上角×，关闭对话框。