如何使用splash和scrapy将变量从Lua脚本传递到Javascript？

function main(splash, args)
  local myVariable = "Hello, World!"
  splash:set_result(myVariable)
  return splash:html()
end

import scrapy
from scrapy_splash import SplashRequest

class MySpider(scrapy.Spider):
    name = 'my_spider'

    def start_requests(self):
        url = 'http://example.com'
        yield SplashRequest(url, self.parse, args={'lua_source': self.get_lua_script()})

    def parse(self, response):
        result = response.data['result']
        # 在这里处理JavaScript返回的结果

    def get_lua_script(self):
        lua_script = """
        function main(splash, args)
          local myVariable = "Hello, World!"
          splash:set_result(myVariable)
          return splash:html()
        end
        """
        return lua_script