https://docs.scrapy.org/en/latest/intro/tutorial.html xpath @选择属性 .当前目录下选择 //任意路径选择 /bookstore/book
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https://docs.scrapy.org/en/latest/intro/tutorial.html
xpath @选择属性 .当前目录下选择 //任意路径选择
/bookstore/book[position()<3]，选取最前面的两个属于 bookstore 元素的子元素的 book 元素
css span.text::text
response.css("span.text").text().get() /// AttributeError: ‘SelectorList‘ object has no attribute ‘text‘
quote.css("span.text::text").get() 选择span下面text的text（）标签内容
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scrapy crawl quotes -o quotes.json .
That will generate an quotes.json file containing all scraped items,serialized in JSON.
For historic reasons,Scrapy appends to a given file instead of overwriting its contents. If you run this command twice without removing the file before the second time,you’ll end up with a broken JSON file.
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