<!DOCTYPE html>//DTD文档声明
<html lang="en">
<head>
<meta charset="utf-8">
<title>html文档结构</title>
</head>
<body>
</body>
</html>
<!DOCTYPE html>//DTD文档声明
<html lang="en">
<head>
<meta charset="utf-8">
<title>html文档结构</title>
</head>
<body>
</body>
</html>