以下是一个使用 HTML、CSS 和 JavaScript 实现的登录弹窗效果示例：
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<title>登录弹窗示例</title>
<style>
body {
font-family: Arial, sans-serif;
margin: 0;
padding: 20px;
}
/* 遮罩层样式 */
.modal-mask {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: rgba(0, 0, 0, 0.5);
display: none;
justify-content: center;
align-items: center;
z-index: 999;
}
/* 弹窗容器 */
.modal-container {
background: white;
padding: 30px;
border-radius: 8px;
box-shadow: 0 2px 8px rgba(0, 0, 0, 0.33);
width: 320px;
animation: modalIn 0.3s ease;
}
/* 弹窗动画 */
@keyframes modalIn {
from {
transform: translateY(-20px);
opacity: 0;
}
to {
transform: translateY(0);
opacity: 1;
}
}
/* 表单样式 */
.login-form {
display: flex;
flex-direction: column;
}
.form-group {
margin-bottom: 15px;
}
input {
width: 100%;
padding: 8px;
border: 1px solid #ddd;
border-radius: 4px;
box-sizing: border-box;
}
button {
background: #2196F3;
color: white;
padding: 10px;
border: none;
border-radius: 4px;
cursor: pointer;
}
button:hover {
background: #1976D2;
}
.close-btn {
float: right;
cursor: pointer;
font-size: 24px;
line-height: 1;
padding: 0 8px;
}
</style>
</head>
<body>
<button onclick="showLoginModal