从javascript向pyqt5返回值

// 发送请求
fetch('/api/getData', {
  method: 'POST',
  body: JSON.stringify({ param: 'value' }),
  headers: {
    'Content-Type': 'application/json'
  }
})
.then(response => response.json())
.then(data => {
  // 处理后端返回的值
  console.log(data);
})
.catch(error => {
  console.error('Error:', error);
});

from PyQt5.QtCore import QUrl
from PyQt5.QtWebEngineWidgets import QWebEngineView
from PyQt5.QtWidgets import QApplication
from PyQt5.QtWebChannel import QWebChannel
from PyQt5.QtCore import QObject, pyqtSlot, pyqtSignal
import sys
import json

class Backend(QObject):
    # 定义信号，用于发送返回值给前端
    returnData = pyqtSignal(str)

    @pyqtSlot(str)
    def getData(self, param):
        # 执行相应的逻辑操作，得到返回值
        result = {'data': 'Hello, ' + param}
        # 将返回值发送给前端
        self.returnData.emit(json.dumps(result))

app = QApplication(sys.argv)
webview = QWebEngineView()
channel = QWebChannel()
backend = Backend()
channel.registerObject('backend', backend)
webview.page().setWebChannel(channel)
webview.load(QUrl('path/to/your/html/file'))
webview.show()
sys.exit(app.exec_())