如何将JavaScript插入< script/>元素? [英] How to insert JavaScript into <script/> element?

问题描述

我所拥有的是:

from lxml import etree
myscript = "if(0 < 1){alert(\"Hello World!\");}"
html = etree.fromstring("<script></script>")

for element in html.findall('//script'):
    element.text = myscript

result = etree.tostring(html)

我得到的是:

>>> result
'<script>if(0 &lt; 1){alert("Hello World!");}</script>'

我想要的是未转义的 JavaScript:

What I want is unescaped JavaScript:

>>> result
'<script>if(0 < 1){alert("Hello World!");}</script>'

推荐答案

您不能. lxml.etree和 ElementTree 是XML解析器，因此无论您想要什么解析或与其创建必须是有效的XML.在某些节点文本中未转义的<无效XML.它是有效的HTML，但不是有效的XML.

You can’t. lxml.etree and ElementTree are XML parsers, so whatever you want to parse or create with them has to be valid XML. And an unescaped < inside some node text is not valid XML. It’s valid HTML but not valid XML.

这就是为什么在XHTML中通常必须在<script>标记内添加CDATA块，以便可以在其中放置任何而不用担心有效的XML结构.

That’s why in XHTML, you usually had to add CDATA blocks inside <script> tags, so you could put whatever in there without having to worry about valid XML structure.

但是，在您的情况下，您只想生成HTML，为此，您应该使用HTML解析器.例如 BeautifulSoup :

But in your case, you just want to produce HTML, and for that, you should use an HTML parser. For example BeautifulSoup:

>>> from bs4 import BeautifulSoup
>>> soup = BeautifulSoup('<script></script>')
>>> soup.find('script').string = 'if(0 < 1){alert("Hello World!");}'
>>> str(soup)
'<script>if(0 < 1){alert("Hello World!");}</script>'

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