每个用户请求期间所做的数据变更都要被保存。
Data changes made during every user request would need to be saved.
root用户可以将文件变更到任意组。
root用户可以使用chown命令变更文件的所有权。
The root user can change the ownership of a file using the chown command.
与数据值变更相关的用户代码
这么一来就会在用户端中提供一个事件，以通知您记录状态已经发生变更。
This provides an event in the client that notifies you that history state has changed.
这么一来就会在用户端中提供一个事件，以通知您记录状态已经发生变更。
This provides an event in the client that notifies you that history state has changed.
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