问如何在Scrapy中将response.text转换为json

EN

import scrapy
import re
import json

class StocksSpider(scrapy.Spider):
    name = 'stocks'
    allowed_domains = ['web.ifzq.gtimg.cn']
    start_urls = ['http://web.ifzq.gtimg.cn/appstock/hk/HkInfo/getFinReport?type=3&reporttime_type=1&code=00001&startyear=1990&endyear=2016&_callback=jQuery11240339550$']

    def start_requests(self):
        for url in self.start_urls:
            yield scrapy.Request(url=url, callback=self.parse,
            #endpoint='render.json', # optional; default is render.html
            #splash_url='<url>',     # optional; overrides SPLASH_URL
            #slot_policy=scrapy_splash.SlotPolicy.PER_DOMAIN,  # optional
            )

    def parse(self, response):
        try:
            json_data = re.search('\{\"data\"\:(.+?)\}\}\]', response.text).group(1)
        except AttributeError:
            json_data = ''
        #print json_data
        loaded_json = json.loads(json_data)

        print loaded_json

    Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/scrapy/utils/defer.py", line 102, in iter_errback
    yield next(it)
  File "/usr/local/lib/python2.7/dist-packages/scrapy_splash/middleware.py", line 156, in process_spider_output
    for el in result:
  File "/usr/local/lib/python2.7/dist-packages/scrapy/spidermiddlewares/offsite.py", line 30, in process_spider_output
    for x in result:
  File "/usr/local/lib/python2.7/dist-packages/scrapy/spidermiddlewares/referer.py", line 339, in <genexpr>
    return (_set_referer(r) for r in result or ())
  File "/usr/local/lib/python2.7/dist-packages/scrapy/spidermiddlewares/urllength.py", line 37, in <genexpr>
    return (r for r in result or () if _filter(r))
  File "/usr/local/lib/python2.7/dist-packages/scrapy/spidermiddlewares/depth.py", line 58, in <genexpr>
    return (r for r in result or () if _filter(r))
  File "/root/finance/finance/spiders/stocks.py", line 25, in parse
    loaded_json = json.loads(json_data)
  File "/usr/lib/python2.7/json/__init__.py", line 339, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python2.7/json/decoder.py", line 364, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib/python2.7/json/decoder.py", line 382, in raw_decode
    raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded
2018-06-09 23:54:26 [scrapy.core.engine] INFO: Closing spider (finished)