void MainWindow::on_pushButtonShowMarker_clicked()

{

     QString lat = "104.701681";

     QString lon = "31.535617";

    //ui->webViewMap->page()->mainFrame().evaluateJavaScript("addMarker()");

   // double w=lat.toDouble();

   // double k=lon.toDouble();

    QString command = QString("addMarker(%1, %2)").arg(lat)//addMarker为JavaScript函数addMarker(lat,lon)

          .arg(lon);

    //ui->webViewMap->page()->mainFrame()->addToJavaScriptWindowObject("jingdu", jingdu);

     qDebug()<<command;

    ui->webViewMap->page()->mainFrame()->evaluateJavaScript(command);

}