headers={
'User-Agent':'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.62 Safari/537.36',
'Referer':Referer,
'Content-Type':'application/json;charset=UTF-8',
'5c4d8797ab7576ce2339':'299fa9ae437bcd55403d6f6ef4d06a7a9270cc0b28c9b60a77f52ddc2b19b583c8f4215cc385ef7c4f3fef6097d91dc723f89d3c4f9b9768b2685a190c41400a'}
payload={"area":{"province":"31"},"key":brand,"page":i}
yieldscrapy.Request(url=url, method='POST', body=json.dumps(payload), headers=headers, cookies=random.choice(allcookie), meta={'brand':brand,'url':url}, callback=self.index, dont_filter=True)
###传递字符串格式的payload形式
url_rl = "https://www.yijiupi.com/v31/Product/ListProduct"
payload = '{"currentPage":1,
"data":{"sonCategoryId":"%s","categoryIds":["%s"],"saleModel":-1,"sort":0,"currentPage":1,"pageSize":60},
"pageSize":60,
"addressId":1745761,
"deviceType":3
}'%(cat_id,cat_id)
# return [scrapy.Request(url=url_rl, body=json.dumps(payload), method="POST", callback=self.get_page_num)]
#这里的payload是字典类型，要换成字符串类型json.dumps(payload)，之后的payload就是字符串类型，直接写payload
request = scrapy.Request(url=url_rl, body=payload, method="POST", callback=self.get_page_sum)
#return [scrapy.Request(url=url_rl, body=json.dumps(payload), method="POST", callback=self.get_page_num)]
yield request
这里的payload之前是字典类型，用return发送请求是需要字符串类型，所以要换成字符串类型json.dumps(payload)，在用yield发送请求是需要的是字典类型，所以直接写payload就行，上面的是yield发送请求，所以body直接等于payload就可以了。
data_url = eval('{"orderby": "0","productTypeId": "%s","currentPage": "%s","pageSize": "12"}' %(id,i))
request = scrapy.FormRequest(url=url, formdata=data_url, callback=self.get_parse,dont_filter=True)
##yield scrapy.FormRequest(roomUrl, formdata=payload, callback=self.parseInfo, dont_filter=True)
