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如图片所示，正常编译而没有报错，这不合理啊！
这不是赋值，是构造函数的参数啊，QTimer的构造函数是QTimer(QObject *parent = nullptr)，你这样就把这个new出来的QTimer作为它的parent传给它的构造函数了，编译当然没问题，在运行时因为m_timer应该会早于它的parent被销毁所以也没有问题
