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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                翻頁請求的思路如下: (1)找到下一頁的url地址; (2)調用`yield scrapy.Request`向下一頁發出請求; ```python class Request(object_ref): def __init__(self, url, callback=None, method='GET', headers=None, body=None, cookies=None, meta=None, encoding='utf-8', priority=0, dont_filter=False, errback=None, flags=None, cb_kwargs=None) url:url callback:表示當前的url的響應交給哪個函數去處理 meta:實現數據在不同的解析函數中傳遞,meta默認帶有部分數據,比如下載延遲,請求深度等 dont_filter:默認為False,會過濾請求的url地址,即請求過的url地址不會繼續被請求, 對需要重復請求的url地址可以把它設置為Ture,比如貼吧的翻頁請求, 頁面的數據總是在變化;start_urls中的地址會被反復請求,否則程序不會啟動 method:指定POST或GET請求 headers:接收一個字典,其中不包括cookies cookies:接收一個字典,專門放置cookies body:接收json字符串,為POST的數據,發送payload_post請求時使用 ``` ```python """ 例: books.py @Date 2021/4/26 """ import scrapy class BooksSpider(scrapy.Spider): name = 'books' allowed_domains = ['item.jd.com'] start_urls = ['https://item.jd.com/13201282.html'] def parse(self, response): yield scrapy.Request( url='https://item.jd.com/13142372.html', callback=self.parse_next, meta={'pre': response.url} ) def parse_next(self, response): # 或者 response.meta['pre'] pre = response.meta.get('pre') current = response.url print(pre) # https://item.jd.com/13201282.html print(current) # https://item.jd.com/13142372.html ```
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                              哎呀哎呀视频在线观看