如何使用Scrapy + Splash单击同一页面上的两个按钮？

SPLASH_URL = 'http://localhost:8050'
DOWNLOADER_MIDDLEWARES = {
    'scrapy_splash.SplashCookiesMiddleware': 723,
    'scrapy_splash.SplashMiddleware': 725,
    'scrapy.downloadermiddlewares.httpcompression.HttpCompressionMiddleware': 810,
}
SPIDER_MIDDLEWARES = {
    'scrapy_splash.SplashDeduplicateArgsMiddleware': 100,
}

import scrapy
from scrapy_splash import SplashRequest

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

    def start_requests(self):
        url = 'http://example.com'
        script = """
        function main(splash)
            splash:go(splash.args.url)
            splash:wait(1)
            splash:runjs("document.getElementById('button1').click();")
            splash:wait(1)
            splash:runjs("document.getElementById('button2').click();")
            splash:wait(1)
            return splash:html()
        end
        """
        yield SplashRequest(url, self.parse, endpoint='execute', args={'lua_source': script})

    def parse(self, response):
        # 处理爬取到的数据
        pass

scrapy crawl my_spider