https://blog.csdn.net/qq78442761/article/details/79720578
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widget2=new Widget2();
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connect(widget2,SIGNAL(sendData(QString)),this,SLOT(receivData(QString)));
https://blog.csdn.net/qq78442761/article/details/79720578
widget2=new Widget2();
connect(widget2,SIGNAL(sendData(QString)),this,SLOT(receivData(QString)));