In the early days of the Web, this used to be accomplished using a metarefresh.
在Web早期，这一点常使用meta刷新实现。
2
The Google spider will choke on a metarefresh redirect and a 302 redirect can cause duplicate content penalties.
Google爬行器会由于元刷新重定向而阻塞，而302重定向会导致重复内容处罚。
3
Some user agents support the use of META to refresh the current page after a specified number of seconds, with the option of replacing it by a different URI.