实用代码：HTML+JS+CSS实现的全屏自动切换背景的时尚登录与注册块翻转切换页面代码详解

由于提问中的代码块过长，我将提供一个简化的示例，展示如何使用HTML、CSS和JavaScript创建一个简单的时尚背景图片自动切换的登录注册页面。




<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Login & Register Page</title>
<style>
  body, html {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
  }
  .bg-slider {
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-size: cover;
    background-position: center;
    transition: background-image 1s ease-in-out;
  }
  .bg-slider.day {
    background-image: url('day-background.jpg');
  }
  .bg-slider.night {
    background-image: url('night-background.jpg');
  }
  .container {
    width: 300px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.8);
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
  }
  .toggle-container {
    margin-top: 20px;
    text-align: center;
  }
  button {
    padding: 10px 20px;
    background: #333;
    color: white;
    border: none;
    cursor: pointer;
  }
  button:hover {
    background: #555;
  }
</style>
</head>
<body>
 
<div class="bg-slider day"></div>
 
<div class="container">
  <!-- Login and Register Forms -->
</div>
 
<div class="toggle-container">
  <button onclick="toggleDayNight()">切换</button>
</div>
 
<script>
// 自动切换背景图片的函数
function autoChangeBackground() {
  const body = document.body;
  const bgSlider = document.querySelector('.bg-slider');
  const dayClass = 'day';
  const nightClass = 'night';
 
  setInterval(function() {
    if (body.classList.contains(dayClass)) {
      body.classList.remove(dayClass);
      body.classList.add(nightClass);
    } else {
      body.classList.remove(nightClass);
      body.classList.add(dayClass);
    }
  }, 5000); // 每5秒切换一次
}
 
// 手动切换背景的函数
function toggleDayNight() {
  const bgSlider = document.querySelector('.bg-slider');
  if (bgSlider.classList.contains('day')) {
    bgSlider.classList.remove('day');
    bgSlider.classList.add('night');
  } else {
    bgSlider.classList.remove('night');
    bgSlider.classList.add('day');
  }
}
 
// 页面加载完成后自动开始背景切换
window.onload = function() {
  autoChangeBackground();
};
</script>
 
</body>
</html>

这个简化的代码实例展示了如何使用CSS类来控制背景图片的切换，并且使用JavaScript定时器实现自动切换。用户可以通过点击按钮手动切换背景，而自动切换则

实用代码：HTML+JS+CSS实现的全屏自动切换背景的时尚登录与注册块翻转切换页面代码详解

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