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继承自QWebPage的子类中的构造函数中调用了setNetworkAccessManager(0)。
程序还能打开网页。 为什么会这样? QWebPage不需要一个QNetworkAccessManager吗?
个人认为如未显示指定QNetworkAccessManager则Qt将会在内部创建一个,具体细节请查看源码