python - pyspider翻页问题？

想要爬取爱卡汽车的每个汽车的口碑，但是在翻页问题总是进不去，无论是用chorme还是自带的css selector helper抓取到的CSS PATH都无法翻页，请求帮助，代码如下

#!/usr/bin/env python
# -*- encoding: utf-8 -*-
# Created on 2017-03-21 12:57:03
# Project: test03
import re
from pyspider.libs.base_handler import *


class Handler(BaseHandler):
    crawl_config = {
    }

    @every(minutes=24 * 60)
    def on_start(self):
        self.crawl('http://newcar.xcar.com.cn/price/', callback=self.index_page)

    @config(age=10 * 24 * 60 * 60)
    def index_page(self, response):
        for each in response.doc('a[href^="http"]').items():
            if re.match("http://newcar.xcar.com.cn/\d", each.attr.href, re.U): 
                self.crawl(each.attr.href, callback=self.list_page)
    def list_page(self, response):
        for each in response.doc('body > p.demio_wp > p > ul > li:nth-child(6) > a').items():
            self.crawl(each.attr.href, callback=self.list_page1)
    
    def list_page1(self, response):
        for each in response.doc('.review_gml_tit > .more').items():
            self.crawl(each.attr.href, callback=self.detail_page)
         #翻页，问题出在下面这里
        for each in response.doc('body > p.review_main > p.review_left > p > p.review_comments > p.review_comments_dl > p.pagers > a:nth-child(2)').items():
            self.crawl(each.attr.href, callback=self.list_page1)
            
    @config(priority=2)
    def detail_page(self, response):
        return {
            "branch":response.doc('#nav_ps > em > a').text(),
            "text":response.doc('body > p.review_main > p.review_left > p > p.review_comments > p.review_comments_dl > dl > dd').text(),
           
        }