js登录弹窗

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Login Popup</title>
<style>
  .modal {
    display: none;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.4);
  }
  .modal-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 30%;
  }
  .close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
  }
  .close:hover,
  .close:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
  }
</style>
</head>
<body>

<button id="openModalBtn">Open Login Popup</button>

<div id="myModal" class="modal">
  <div class="modal-content">
    <span class="close">&times;</span>
    <h2>Login</h2>
    <form id="loginForm">
      <input type="text" id="username" placeholder="Username">
      <input type="password" id="password" placeholder="Password">
      <button type="submit">Login</button>
    </form>
  </div>
</div>

<script>
  var modal = document.getElementById("myModal");
  var btn = document.getElementById("openModalBtn");
  var span = document.getElementsByClassName("close")[0];

  btn.onclick = function() {
    modal.style.display = "block";
  }

  span.onclick = function() {
    modal.style.display = "none";
  }

  window.onclick = function(event) {
    if (event.target == modal) {
      modal.style.display = "none";
    }
  }

  document.getElementById('loginForm').addEventListener('submit', function(event) {
    event.preventDefault();
    var username = document.getElementById('username').value;
    var password = document.getElementById('password').value;
    // 这里可以添加发送数据到服务器的代码
    console.log('Username:', username, 'Password:', password);
    modal.style.display = "none";
  });
</script>

</body>
</html>