JSON是数据要通过HTTP协议（如文本，HTML，PDF等），只是还没有另一种格式。你可能指的是 cometd 。

JSON is just yet another format of data going over the HTTP protocol (like text, html, pdf, etc). You are probably referring to cometd.

这允许你打开一个持久连接，并从服务器到客户端推送数据（即流式处理）。任何格式有效推动，客户端只需要了解它。

This allows you to open a persistent connection and push data from the server to the client (ie stream it). Any format is valid to push, the client just needs to understand it.