Look at the effect
背景圖片自己可設置。
實現過程：
1 、引入依賴文件 EasePack.min.js、TweenLite.min.js
2、引入canvas文件, canvasGeneratrix.js
3、寫入到html (父元素添加ID=large-header),不依賴jquery
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>canvas</title>
</head>
<body>
<div id="large-header">
<canvas id="demo-canvas"></canvas>
</div>
</body>
<script src="./TweenLite.min.js" type="text/javascript"></script>
<script src="./EasePack.min.js" type="text/javascript"></script>
<script src="./canvasGeneratrix.js" type="text/javascript"></script>
</html>
下載canvas文件（需要5C幣）：https://download.csdn.net/download/zeng092210/11246651
下載依賴文件：鏈接：https://pan.baidu.com/s/1O-eUx9cbSBx7WDGOiH1rmw 提取碼：vc5m