js生日动画效果源码

生日动画效果通常涉及到JavaScript与CSS的结合使用，以创建动态的用户界面元素。以下是一个简单的生日动画效果的源码示例：

HTML部分

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>生日动画</title>
<link rel="stylesheet" href="styles.css">
</head>
<body>
<div class="birthday-cake">
  <div class="candle"></div>
</div>
<script src="script.js"></script>
</body>
</html>

CSS部分（styles.css）

body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: #f0f0f0;
}

.birthday-cake {
  position: relative;
  width: 200px;
  height: 200px;
  background-color: #fff;
  border-radius: 10px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.candle {
  position: absolute;
  top: -20px;
  left: 50%;
  transform: translateX(-50%);
  width: 10px;
  height: 100px;
  background-color: #ffcc00;
  border-radius: 5px;
  animation: flicker 1s infinite alternate;
}

@keyframes flicker {
  from { opacity: 0.8; transform: translateX(-50%) scale(1); }
  to { opacity: 1; transform: translateX(-50%) scale(1.1); }
}

JavaScript部分（script.js）

document.addEventListener('DOMContentLoaded', function() {
  const cake = document.querySelector('.birthday-cake');
  const candle = document.querySelector('.candle');

  cake.addEventListener('click', function() {
    candle.style.animationPlayState = 'paused';
    cake.classList.add('blow-out');
  });
});

CSS部分（续）

.blow-out::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(255,255,255,0.8) 10%, rgba(255,255,255,0) 70%);
  animation: blowOut 1s forwards;
}

@keyframes blowOut {
  0% { transform: scale(1); opacity: 1; }
  100% { transform: scale(3); opacity: 0; }
}