On the realization of automatic Operation by Pyqt5 - Codes Helper

with the help of Li Yi"s PyQt5 embedded browser injecting Javascript scripts to automate operations , I have now completed the automation of low-cost airlines, but now I have encountered several problems:

after I complete the order, such as entering the last page, and determine that the page url is / BookFlight/Wait, how can I pass it to my app to shut it down automatically? Or how to catch an exception along the way (such as when a CAPTCHA pops up)
how to agent IP for Pyqt5"s embedded browser
when I am encapsulating the code to flask, how to pass the parameters in JS? there will be an error when I use format or% S, because there are "{}" and "[]"

I hope my doubts can be answered

the current Python code is as follows:

-sharp 
-sharp -*- coding: utf-8 -*-
""" PyQt5  Javascript """
import os
import sys
from datetime import datetime

from PyQt5.QtWidgets import (
    QWidget, QApplication, QVBoxLayout, QHBoxLayout,
    QDesktopWidget, QTextEdit, QLabel, QLineEdit, QPushButton,
    QFileDialog, QProgressBar,
)
from PyQt5.QtCore import QUrl, pyqtSlot
from PyQt5.QtWebEngineWidgets import QWebEngineView, QWebEngineProfile, QWebEngineScript, QWebEnginePage


class Browser(QWidget):

    def __init__(self):
        super().__init__()
        self.init_ui()

        -sharp 
        self.profile = QWebEngineProfile.defaultProfile()
        self.script = QWebEngineScript()
        self.prepare_script()

    def init_ui(self):
        self.webView = QWebEngineView()

        self.logEdit = QTextEdit()
        self.logEdit.setFixedHeight(100)

        self.addrEdit = QLineEdit()
        self.addrEdit.returnPressed.connect(self.load_url)
        self.webView.urlChanged.connect(
            lambda i: self.addrEdit.setText(i.toDisplayString()))

        self.jsEdit = QLineEdit()
        self.jsEdit.setText("TR.js")

        loadUrlBtn = QPushButton("")
        loadUrlBtn.clicked.connect(self.load_url)

        chooseJsBtn = QPushButton("")
        chooseJsBtn.clicked.connect(self.choose_js_file)

        -sharp /
        top = QWidget()
        top.setFixedHeight(80)
        topBox = QVBoxLayout(top)
        topBox.setSpacing(0)
        topBox.setContentsMargins(5, 0, 0, 5)

        progBar = QProgressBar()
        progBox = QHBoxLayout()
        progBox.addWidget(progBar)
        topBox.addLayout(progBox)

        naviBox = QHBoxLayout()
        naviBox.addWidget(QLabel(""))
        naviBox.addWidget(self.addrEdit)
        naviBox.addWidget(loadUrlBtn)
        topBox.addLayout(naviBox)

        naviBox = QHBoxLayout()
        naviBox.addWidget(QLabel(""))
        naviBox.addWidget(self.jsEdit)
        naviBox.addWidget(chooseJsBtn)
        topBox.addLayout(naviBox)

        self.webView.loadProgress.connect(progBar.setValue)

        -sharp 
        layout = QVBoxLayout(self)
        layout.addWidget(self.webView)
        layout.addWidget(top)
        layout.addWidget(self.logEdit)

        self.show()
        self.resize(1024, 900)
        self.center()

    def center(self):
        qr = self.frameGeometry()
        cp = QDesktopWidget().availableGeometry().center()
        qr.moveCenter(cp)
        self.move(qr.topLeft())

    @pyqtSlot()
    def load_url(self):
        url = self.addrEdit.text().strip()
        if not url.lower().startswith("http://") \
                and not url.lower().startswith("https://"):
            url = "http://{}".format(url)
        self.load(url)

    @pyqtSlot()
    def choose_js_file(self):
        f, _ = QFileDialog.getOpenFileName(filter="Javascript files(*.js)")
        if os.path.isfile(f):
            self.jsEdit.setText(f)
            self.prepare_script()

    def prepare_script(self):
        path = self.jsEdit.text().strip()
        if not os.path.isfile(path):
            self.log("invalid js path")
            return

        self.profile.scripts().remove(self.script)
        with open(path, "r", encoding="utf-8") as f:
            self.script.setSourceCode(f.read())
        self.profile.scripts().insert(self.script)
        self.log("injected js ready")

    def log(self, msg, *args, **kwargs):
        m = msg.format(*args, **kwargs)
        self.logEdit.append("{} {}".format(
            datetime.now().strftime("%H:%M:%S"), m))

    def load(self, url):
        self.log(f"loading {url}")
        self.addrEdit.setText(url)
        self.webView.load(QUrl(url))


if __name__ == "__main__":
    app = QApplication(sys.argv)
    b = Browser()
    b.load("http://www.flyscoot.com/zh")
    sys.exit(app.exec_())

the current js code is as follows:

// 
function handle(path) {
    // 
    if (path == "/zh") {
        document.getElementsByClassName("radio-inline")[1].click();
        document.getElementById("oneway_from").value = " (CAN)";
        document.getElementById("oneway_to").value = " (SIN)";
        document.getElementById("oneway_departuredate").value = "20181020";
        document.getElementsByClassName("btn--booking")[1].click();
        return;
    }

    // 
    if (path == "/Book/Flight") {
        document.getElementsByClassName("price--sale")[0].click();
        document.getElementsByClassName("heading-4")[0].click();
        document.getElementsByClassName("btn-submit")[0].click();
        return;
    }

    // 
    if (path == "/BookFlight/Passengers") {
        // document.getElementsByClassName("fname1")[0].value = "";
        document.getElementById("selecttitle1").value="MR";
        document.getElementById("revPassengersInput_PassengerInfantModels_PassengersInfo_0__First").value = "tom";
        document.getElementById("revPassengersInput_PassengerInfantModels_PassengersInfo_0__Last").value = "wang";
        document.getElementById("revPassengersInput_PassengerInfantModels_PassengersInfo_0__DayOfBirth").value = "12";
        document.getElementById("revPassengersInput_PassengerInfantModels_PassengersInfo_0__MonthOfBirth").value = "12";
        document.getElementById("revPassengersInput_PassengerInfantModels_PassengersInfo_0__YearOfBirth").value = "1995";
        document.getElementById("revPassengersInput_PassengerInfantModels_PassengersInfo_0__Nationality").value = "CN";
        document.getElementsByClassName("radio-inline")[4].click();
        document.getElementsByClassName("btn-submit")[0].click();
    }
    if (path == "/BookFlight/Seats") {
        document.getElementById("nextFlightButton").click();
    }
    if (path == "/BookFlight/AddOns") {
        document.getElementsByClassName("btn-submit")[0].click();
    }
    if (path == "/BookFlight/Payment") {
        /*! jQuery v3.2.1 | (c) JS Foundation and other contributors | jquery.org/license */ 
        // jquery 

        document.getElementById("revContactInput_WorkPhone_Number").value="13578978541";
        document.getElementById("emailContact").value="wc110302@126.com";
        document.getElementsByTagName("input")[54].value="wc110302@126.com";
        document.getElementsByClassName("radio-inline")[4].click();
        document.getElementById("revContactInput_ContactViewModel_AddressLine1").value="guojiaqiao";
        document.getElementById("revContactInput_ContactViewModel_PostalCode").value="401122";
        document.getElementById("revContactInput_ContactViewModel_City").value="chengdu";

        $("-sharprevContactInput_ContactViewModel_CountryCode").click(function(){

            $("-sharprevContactInput_ContactViewModel_CountryCode").val("CN");

            selDom=$("-sharprevContactInput_ContactViewModel_ProvinceState");

            selDom.append("<option value="CQ">Chongqing</option>");//option

            $("-sharprevContactInput_ContactViewModel_CountryCode").change();

        });

        $("-sharprevContactInput_ContactViewModel_CountryCode").click()


        document.getElementById("revContactInput_ContactViewModel_ProvinceState").click()
        var city = document.getElementById("revContactInput_ContactViewModel_ProvinceState");
        for (var i = 0; i < city.length; iPP) {
            if (city[i].text == "Chongqing") { //
                city[i].selected=true; //
        }
    };



    $(".slick-slide").each(function(){
        if ($(this).children("a").html()==""){
            $(this).removeClass("active")
        }
        if ($(this).children("a").html()=="UnionPay"){
            $(this).trigger("focus")
            $(this).children("a").trigger("focus")
            $(this).children("a")[0].click()
            $(this).addClass("active")
        }
    });

        document.getElementsByClassName("push-checkbox")[1].click();
        document.getElementsByClassName("btn-submit")[0].click();

    }
}

let host = document.location.hostname;
if (host.endsWith(".flyscoot.com")) {
    handle(document.location.pathname);
}