从js中提取数据

<script language="JavaScript" type="text/javascript+gk-onload">

    SKART = (SKART) ? SKART : {};
    SKART.analytics = SKART.analytics || {};
    SKART.analytics["category"] = "television";
    SKART.analytics["vertical"] = "television";
    SKART.analytics["supercategory"] = "homeentertainmentlarge";
    SKART.analytics["subcategory"] = "television";

</script>

You can use the Selector's built-in support for regular expressions through re():

pattern = r'SKART.analytics["category"] = "(w+)";'
response.xpath('//script[@type="text/javascript+gk-onload"]').re(pattern)

Demo (using scrapy shell):

$ scrapy shell index.html
In [1]: pattern = r'SKART.analytics["category"] = "(w+)";'

In [2]: response.xpath('//script[@type="text/javascript+gk-onload"]').re(pattern)
Out[2]: [u'television']

https://stackoverflow.com/questions/29163395/scrapy-and-xpath-to-extract-data-from-javascript-code