爬取京东的商品信息，并保存至CSV文件中（类）

# -*- coding: utf-8 -*-
# @Time    : 2018/12/27  17:06
# @Author  : zhangxinxin
# 感谢小六，小勾， 小胖给予的帮助
# @Email   : 778786617@qq.com
# @Software: PyCharm
import csv
import requests
import time
import json
from lxml import etree

# https://search.jd.com/Search?keyword=%E6%89%8B%E6%9C%BA&enc=utf-8&wq=%E6%89%8B%E6%9C%BA&pvid=3d144eda1ae5453e80e1debdea954230
# https://search.jd.com/Search?keyword=%E6%89%8B%E6%9C%BA&enc=utf-8&qrst=1&rt=1&stop=1&vt=2&wq=%E6%89%8B%E6%9C%BA&cid2=653&cid3=655&page=1&s=1&click=0
# https://search.jd.com/Search?keyword=%E6%89%8B%E6%9C%BA&enc=utf-8&qrst=1&rt=1&stop=1&vt=2&wq=%E6%89%8B%E6%9C%BA&cid2=653&cid3=655&page=3&s=60&click=0


class JdMessage(object):
    def __init__(self):
        self.js_url = 'https://club.jd.com/comment/productCommentSummaries.action?referenceIds=7652027,5089253,5853579,100001172674,100000822981,7