BeautifulSoup是一个html解析器;您还需要一个JavaScript解析器。顺便说一句,某些javascript对象文字是无效的json(尽管在您的示例中,文字也是有效的json对象)。
在简单的情况下,您可以:
例:
#!/usr/bin/env python
html = """<!doctype html>
<title>extract javascript object as json</title>
<script>
// ..
window.blog.data = {"activity":{"type":"read"}};
// ..
</script>
<p>some other html here
"""
import json
import re
from bs4 import BeautifulSoup # $ pip install beautifulsoup4
soup = BeautifulSoup(html)
script = soup.find('script', text=re.compile('window\.blog\.data'))
json_text = re.search(r'^\s*window\.blog\.data\s*=\s*({.*?})\s*;\s*$',
script.string, flags=re.DOTALL | re.MULTILINE).group(1)
data = json.loads(json_text)
assert data['activity']['type'] == 'read'
如果假设不正确,则代码将失败。
为了放松第二个假设,可以使用JavaScript解析器代替正则表达式,例如,slimit
(由@approximatenumber建议):
from slimit import ast # $ pip install slimit
from slimit.parser import Parser as JavascriptParser
from slimit.visitors import nodevisitor
soup = BeautifulSoup(html, 'html.parser')
tree = JavascriptParser().parse(soup.script.string)
obj = next(node.right for node in nodevisitor.visit(tree)
if (isinstance(node, ast.Assign) and
node.left.to_ecma() == 'window.blog.data'))
# HACK: easy way to parse the javascript object literal
data = json.loads(obj.to_ecma()) # NOTE: json format may be slightly different
assert data['activity']['type'] == 'read'
无需将对象文字(obj
)视为json对象。为了获得必要的信息,obj
可以像其他ast节点一样递归访问。它将允许支持任意javascript代码(可由解析slimit
)。