<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width,initial-scale=1.0" />
<title>数据可视化</title>
<!-- css引入 -->
<link rel="stylesheet" href="css/index.css" />
</head>
<body>
</body>
</html>