网页爬虫 - Python小白用Scrapy爬虫返回的是空元素，请问各位大神哪里出了问题？

Question

用scrapy爬了图书馆书籍的书名和评论，用Chrome的检查拔下来的Xpath，但是运行爬虫返回的是空元素，请问各位哪里出了问题，谢谢大家。
截图：

附上我的Scrapy源码，请大家多指教，谢谢！

from scrapy import Spider
from scrapy.selector import Selector
from CommentCrawl.items import CommentcrawlItem

class commentcrawl(Spider):
    name = "commentcrawl"
    allowed_domains = ["http://opac.lib.bnu.edu.cn:8080"]
    start_urls = [
        "http://opac.lib.bnu.edu.cn:8080/F/S9Q2QIQV5D9R9HBHPI2KNN8JH11TRIRSIEPKYQLTAQQ17LA6B6-16834?func=full-set-set&set_number=010408&set_entry=000001&format=999",
    ]
    def parse(self,response):
        item = CommentcrawlItem()
        item['name'] = Selector(response).xpath('//*[@id="details2"]/table/tbody/tr[1]/td[2]/a/text()').extract()
        item['comment'] = Selector(response).xpath('//*[@id="localreview"]/text()').extract()
        yield item

Answer 1

The page requires login to access and lacks login operation.

Answer 2

The page has been blocked by login.

Answer 3

After you print or save the content you actually obtained, see what it is. It is estimated that the returned content does not match your Xpath, so you need to log in.