javascript - 使用 BeautifulSoup 查找具有特定字符串的 JavaScript 变量

Question

我有一个有点棘手的任务，我需要在 JavaScript 变量中找到一些 HTML 并遍历它。

变量看起来像这样:

<script>
var someVar = new something.Something({
    content: 'This text has to be found<br /><table></table>',
    size: 230
)};
....
</script>

不知道JS变量的名称，只能根据This text has to be found查找片段/字符串。后来验证确实是一个JS变量，然后我要取值<br /><table></table>为了遍历它。

Answer 1

一种方法是使用javascript 解析器， slimit 在这种情况下。思路是找到所有脚本标签，遍历它们，解析代码，遍历语法树，检查每个赋值节点右边是否有你要找的文本:

from bs4 import BeautifulSoup
from slimit import ast
from slimit.parser import Parser
from slimit.visitors import nodevisitor

data = """
<script>
var someVar = new something.Something({
    content: 'This text has to be found<br /><table></table>',
    size: 230
});
</script>
"""
text_to_find = 'This text has to be found'

soup = BeautifulSoup(data)

for script in soup.find_all('script'):
    parser = Parser()
    tree = parser.parse(script.text)
    for node in nodevisitor.visit(tree):
        if isinstance(node, ast.Assign):
            value = getattr(node.right, 'value', '')
            if text_to_find in value:
                print value

打印 'This text has to be found<br /><table></table>' .

我不确定它是否完全符合您的需求，但希望这至少是一个开始。

另见:

• > JavaScript parser in Python
• > Extracting text from script tag using BeautifulSoup in Python