Python 能做的所有事情都给我留下了深刻的印象。我想知道的是我是否可以实现一个可以调用 JavaScript 函数的 Python 脚本。
我使用的 Python 代码正在检测 NFC 卡并读取唯一 ID。目前，我使用 Java 小程序与 HTML 页面进行交互。我认为 Python 在这方面更轻、更好。
我尝试的是一个简单的高速公路脚本 server.py 和一个 index.html 文件。
在 server.py 脚本中，我实现了此代码，但它不起作用..
#! /usr/bin/env python
from sys import stdin, exc_info
from time import sleep
from smartcard.CardMonitoring import CardMonitor, CardObserver
from smartcard.util import *
import sys
from twisted.internet import reactor
from twisted.python import log
from twisted.web.server import Site
from twisted.web.static import File
from autobahn.websocket import WebSocketServerFactory, \
WebSocketServerProtocol, \
listenWS
class EchoServerProtocol(WebSocketServerProtocol):
# a simple card observer that prints inserted/removed cards
class printobserver(CardObserver):
"""A simple card observer that is notified
when cards are inserted/removed from the system and
prints the list of cards
"""
def update(self, observable, (addedcards, removedcards)):
for card in addedcards:
print "+Inserted: ", toHexString(card.atr)
#call javascript function with <toHexString(card.atr)>
for card in removedcards:
print "-Removed: ", toHexString(card.atr)
#call javascript function with <toHexString(card.atr)>
try:
print "Insert or remove a smartcard in the system."
print "This program will exit in 10 seconds"
print ""
cardmonitor = CardMonitor()
cardobserver = printobserver()
cardmonitor.addObserver(cardobserver)
sleep(10)
# don't forget to remove observer, or the
# monitor will poll forever...
cardmonitor.deleteObserver(cardobserver)
import sys
if 'win32' == sys.platform:
print 'press Enter to continue'
sys.stdin.read(1)
except:
print exc_info()[0], ':', exc_info()[1]
if __name__ == '__main__':
if len(sys.argv) > 1 and sys.argv[1] == 'debug':
log.startLogging(sys.stdout)
debug = True
else:
debug = False
factory = WebSocketServerFactory("ws://localhost:9000",
debug = debug,
debugCodePaths = debug)
factory.protocol = EchoServerProtocol
factory.setProtocolOptions(allowHixie76 = True)
listenWS(factory)
webdir = File(".")
web = Site(webdir)
reactor.listenTCP(8080, web)
reactor.run()
在索引文件中有一个 JavaScript 函数
function NFCid(msg) {
alert(msg);
}
如何在 server.py 中调用此函数
NFCid(toHexString(card.atr))