disconnect() 等同于disconnect(this, 0, 0, 0), 删除作为信号的this与任何槽的关联
disconnect(receiver) 等同于disconnect(this, 0, receiver, 0)， 删除this与作为槽的receiver的关联
object->disconnect() 即object->disconnect(object->this, 0, 0, 0)
QT disconnect
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转载自blog.csdn.net/zh8706/article/details/103139586
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