该操作允许在显示未读消息和显示所有消息之间进行切换。

This action allows you to toggle between the display of only unread messages and the display of all messages.

youdao

在第2个示例中，看一看如何读消息，这展示了如何在jQuery中使用ajax ？

For the second example, take a look at how I read messages, which shows how Ajax can also be used in jquery.

youdao

下面这张来自于MSDN文档的图片显示了Twitter feed中的未读消息。

This image from the MSDN documentation shows unread messages in a Twitter feed.

youdao