打开者 属性
重写
指向打开此窗口的窗口的引用。
Window thisWindow = window;
WindowBase otherWindow = thisWindow.open('http://www.example.com/', 'foo');
print(otherWindow.opener == thisWindow); // 'true'
实现
WindowBase? get opener => _convertNativeToDart_Window(this._get_opener);
实现
set opener(WindowBase? value) native;