html+js+css登录注册界面

以下是一个简单的HTML、JavaScript和CSS结合的登录注册界面示例：

HTML:




<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Login & Register Form</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
 
<section class="container">
  <div class="login-box">
    <form id="login-form" autocomplete="off">
      <h2>Login</h2>
      <div class="input-group">
        <input type="text" required>
        <label>Username</label>
      </div>
      <div class="input-group">
        <input type="password" required>
        <label>Password</label>
      </div>
      <button type="submit" class="btn">Login</button>
    </form>
    
    <form id="register-form" autocomplete="off">
      <h2>Register</h2>
      <div class="input-group">
        <input type="text" required>
        <label>Username</label>
      </div>
      <div class="input-group">
        <input type="email" required>
        <label>Email</label>
      </div>
      <div class="input-group">
        <input type="password" required>
        <label>Password</label>
      </div>
      <button type="submit" class="btn">Register</button>
    </form>
  </div>
</section>
 
<script src="script.js"></script>
</body>
</html>

CSS (style.css):




body {
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
  background-color: #28a745;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
 
.container {
  width: 100%;
  max-width: 400px;
}
 
.login-box {
  width: 100%;
  max-width: 400px;
  background-color: #fff;
  padding: 30px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  border-radius: 5px;
  position: relative;
}
 
.input-group {
  margin: 10px 0;
}
 
.input-group input {
  width: calc(100% - 10px);
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
  font-size: 16px;
}
 
.input-group label {
  position: absolute;
  top: 0;
  left: 10px;
  padding: 10px;
  pointer-events: none;
  transition: 0.5s;
  font-size: 16px;
}
 
.input-group input:focus ~ label,
.input-group input:valid ~ label {
  top: -20px;
  color: #28a745;
  font-size: 12px;
}
 
.btn {
  width: calc(100% - 20px);
  padding: 10px;
  margin: 10px 0;
  background-color: #28a745;

html+js+css登录注册界面

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