在C++中，这样一个方法可以返回一个值，该方法必须声明为，Q_INVOKABLE并且result在@pyqtSlot装饰器中使用PyQt中的等效方法：
├── index.html
└── main.py
from PyQt5 import QtCore, QtWidgets, QtWebEngineWidgets, QtWebChannel
class Backend(QtCore.QObject):
@QtCore.pyqtSlot(int, **result=int** )
def getRef(self, x):
print("inside getRef", x)
return x + 5
@QtCore.pyqtSlot(int)
def printRef(self, ref):
print("inside printRef", ref)
if __name__ == "__main__":
import os
import sys
app = QtWidgets.QApplication(sys.argv)
backend = Backend()
view = QtWebEngineWidgets.QWebEngineView()
channel = QtWebChannel.QWebChannel()
view.page().setWebChannel(channel)
channel.registerObject("backend", backend)
current_dir = os.path.dirname(os.path.realpath(__file__))
filename = os.path.join(current_dir, "index.html")
url = QtCore.QUrl.fromLocalFile(filename)
view.load(url)
view.resize(640, 480)
view.show()
sys.exit(app.exec_())
<!DOCTYPE html>
<html>
<head>
<@R_301_1926@ http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript" src="qrc:///qtwebchannel/qwebchannel.js"></script>
<script type="text/javascript">
var backend = null;
var x = 5;
window.onload = function()
{
new QWebChannel(qt.webChannelTransport, function(channel) {
backend = channel.objects.backend;
backend.getRef(x, function(pyval) {
backend.printRef(pyval);
});
});
}
</script>
</head>
</html>
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