我想你肯定是创建线程a,再创建线程b,并把a作为b构造函数的参数
这样就会出现你说的问题
直接按字面意思理解就OK
请参考assistant->thread support in Qt:
The child of a QObject must always be created in the thread where the parent was created. This implies, among other things, that you should never pass the QThread object (this) as the parent of an object created in the thread (since the QThread object itself was created in another thread).