小编Kev*_*n G的帖子

是否有@media查询仅针对iOS运行设备？

例如:

@media (min-device-width:320px) and (max-device-width:768px) {
    #nav {
        yada: yada;
    }
}

这也会改变这些宽度视角的Android设备页面的行为？或者我最后弄错了

我的蜘蛛运行没有显示任何错误,但图像没有存储在文件夹中这里是我的scrapy文件:

Spider.py:

import scrapy
import re
import os
import urlparse
from scrapy.spiders import CrawlSpider, Rule
from scrapy.linkextractors import LinkExtractor
from scrapy.loader.processors import Join, MapCompose, TakeFirst
from scrapy.pipelines.images import ImagesPipeline
from production.items import ProductionItem, ListResidentialItem

class productionSpider(scrapy.Spider):
    name = "production"
    allowed_domains = ["someurl.com"]
    start_urls = [
        "someurl.com"
]

def parse(self, response):
    for sel in response.xpath('//html/body'):
        item = ProductionItem()
        img_url = sel.xpath('//a[@data-tealium-id="detail_nav_showphotos"]/@href').extract()[0]
        yield scrapy.Request(urlparse.urljoin(response.url, img_url),callback=self.parseBasicListingInfo,  meta={'item': item})

def parseBasicListingInfo(item, response):
    item = response.request.meta['item']
    item = ListResidentialItem()
    try:
        image_urls = map(unicode.strip,response.xpath('//a[@itemprop="contentUrl"]/@data-href').extract())
        item['image_urls'] = …