<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> <style> ul { list-style-type: none; } ul li a { color: green; text-decoration: none; padding: 3px; display: block; } @media screen and (max- 639px){ ul li a { padding-left: 30px; color:red; } } @media screen and (max- 819px) and (min- 640px) { ul li a { padding-left: 30px; color:green; } } @media screen and (max- 1019px) and (min- 820px) { ul li a { padding-left: 30px; color:yellow; } } @media screen and (min- 1020px) { ul li a { padding-left: 30px; color:pink; } } </style> </head> <body> <h1>重置浏览器窗口，查看效果!</h1> <ul> <li><a data-email="johndoe@example.com" href="mailto:johndoe@example.com">John Doe</a></li> <li><a data-email="marymoe@example.com" href="mailto:marymoe@example.com">Mary Moe</a></li> <li><a data-email="amandapanda@example.com" href="mailto:amandapanda@example.com">Amanda Panda</a></li> </ul> </body> </html>