如何在scrapy中从javascript事件中提取项目？

import scrapy
from scrapy_splash import SplashRequest

class MySpider(scrapy.Spider):
    name = 'my_spider'
    
    def start_requests(self):
        url = 'http://example.com'  # 替换为你要爬取的网页URL
        yield SplashRequest(url, self.parse, args={'wait': 0.5})

    def parse(self, response):
        # 在这里提取JavaScript事件中的项目
        # 使用response.css或response.xpath来定位元素并提取数据
        # 例如：提取所有class为"item"的元素文本内容
        items = response.css('.item::text').extract()
        
        # 处理提取的项目数据
        for item in items:
            # 进行后续处理，例如保存到数据库或输出到文件
            print(item)

DOWNLOADER_MIDDLEWARES = {
    'scrapy_splash.SplashCookiesMiddleware': 723,
    'scrapy_splash.SplashMiddleware': 725,
    'scrapy.downloadermiddlewares.httpcompression.HttpCompressionMiddleware': 810,
}

SPIDER_MIDDLEWARES = {
    'scrapy_splash.SplashDeduplicateArgsMiddleware': 100,
}

DUPEFILTER_CLASS = 'scrapy_splash.SplashAwareDupeFilter'

SPLASH_URL = 'http://localhost:8050'

scrapy crawl my_spider