https://www.cnblogs.com/tid-think/p/9300457.html
2. Qt connect 自定義類型作爲信號和槽函數參數傳遞
https://blog.csdn.net/qq_31306701/article/details/90710780
3.對qt多線程以及事件投遞的理解
https://blog.csdn.net/shaochat/article/details/41956707
4. qt, connect參數,Qt::DirectConnection,Qt::QueuedConnection
https://blog.csdn.net/life_is_too_hard/article/details/52089723
5. 跨線程信號和槽