!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>有序列表</title> </head> <body> <ol type="1"> <li>北京</li> <li>上海</li> <li>广州</li> <li>深圳</li> <title>有序列表</title> </head> <body> <ol type="1"> <li>北京</li> <li>上海</li> <li>广州</li> <li>深圳</li> <title>有序列表</title> </head> <body> <ol type="1"> <li>北京</li> <li>上海</li> <li>广州</li> <li>深圳</li> </html> </html> </html>