Meteor - 服务器端判断用户是否离开网站的方式？

Question

由于 Meteor 使用 WebSockets，我猜可能很容易判断用户是否真的关闭了他们的浏览器，或者至少关闭了带有 Meteor 网站的选项卡。这可行吗？如果可行，怎么做？

Answer 1

来自 Meteor 文档:Meteor.onConnection :

Meteor.onConnection(callback) Server

onConnection returns an object with a single method stop. Calling stop unregisters the callback, so that this callback will no longer be called on new connections.

The callback is called with a single argument, the server-side connection representing the connection from the client.

服务器端连接对象有onClose字段:

onClose Function

Register a callback to be called when the connection is closed. If the connection is already closed, the callback will be called immediately.

需要注意的是，每次连接断开时都会调用此回调。用户是否关闭了他们的浏览器，或者只是暂时失去了他们的连接并且很快就会回来。