更新时间：2023-12-02 08:07:16
看起来 GWT 确实有一个专门针对此的事件.
Looks like GWT does have an event for exactly this.
关闭事件.
看起来你需要实现一个 ClosingHandler
Looks like you need to implement a ClosingHandler
检测浏览器关闭/导航到其他页面并注销的***方法
