1

我正在尝试提取document.write页面上函数内部的框架标签的属性，如下所示：

<script language="javascript">
.
.
.
document.write('<frame name="nav" src="/nav/index_nav.html" marginwidth="0" marginheight="0" scrolling="no" frameborder="0" border = "no" noresize>');
 if (anchor != "") {
  document.write('<frame name="body" src="http://content.members.fidelity.com/mfl/summary/0,,' + cusip + ',00.html?' + anchor + '" marginwidth="0" marginheight="0" scrolling="auto" frameborder="0" noresize>');
 } else {
  document.write('<frame name="body" src="http://content.members.fidelity.com/mfl/summary/0,,' + cusip + ',00.html" marginwidth="0" marginheight="0" scrolling="auto" frameborder="0" noresize>');
 }
 document.write('</frameset>');


// end hiding -->
</script>

findAll('frame')方法没有帮助。有没有办法读取框架标签的内容？

我正在使用 python 2.5 和 BeautifulSoup 3.0.8。

只要我能够得到结果，我也愿意将 python 3.1 与 BeautifulSoup 3.1 一起使用。

谢谢

4

2 回答 2

2

单独使用 BeautifulSoup 是无法做到的。BeautifulSoup 解析到达浏览器的 HTML（在任何重写或 DOM 操作之前），它不解析（更不用说执行）Javascript。

在这种特殊情况下，您可能希望使用简单的正则表达式。

于 2009-12-10T19:14:25.180 回答
1

Pyparsing 可能会帮助您桥接这种 JS 和 HTML 的组合。此解析器查找document.write包含带引号的字符串或多个带引号的字符串和标识符的字符串表达式的语句，准评估字符串表达式，将其解析为嵌入式<frame>标签，并将帧属性作为 pyparsing ParseResults 对象返回，这使您可以访问命名属性就好像它们是对象属性或字典键（您的偏好）。

jssrc = """
<script language="javascript">
.
.
.
document.write('<frame name="nav" src="/nav/index_nav.html" marginwidth="0" marginheight="0" scrolling="no" frameborder="0" border = "no" noresize>'); 
if (anchor != "") 
{  document.write('<frame name="body" src="http://content.members.fidelity.com/mfl/summary/0,,' + cusip + ',00.html?' + anchor + '" marginwidth="0" marginheight="0" scrolling="auto" frameborder="0" noresize>'); } 
else 
{  document.write('<frame name="body" src="http://content.members.fidelity.com/mfl/summary/0,,' + cusip + ',00.html" marginwidth="0" marginheight="0" scrolling="auto" frameborder="0" noresize>'); } 
document.write('</frameset>');
    // end hiding -->
    </script>"""

from pyparsing import *

# define some basic punctuation, and quoted string
LPAR,RPAR,PLUS = map(Suppress,"()+")
qs = QuotedString("'")

# use pyparsing helper to define an expression for opening <frame> 
# tags, which includes support for attributes also
frameTag = makeHTMLTags("frame")[0]

# some of our document.write statements contain not a sting literal,
# but an expression of strings and vars added together; define
# an identifier expression, and add a parse action that converts
# a var name to a likely value
ident = Word(alphas).setParseAction(lambda toks: evalvars[toks[0]])
evalvars = { 'cusip' : "CUSIP", 'anchor' : "ANCHOR" }

# now define the string expression itself, as a quoted string,
# optionally followed by identifiers and quoted strings added
# together; identifiers will get translated to their defined values
# as they are parsed; the first parse action on stringExpr concatenates
# all the tokens; then the second parse action actually parses the
# body of the string as a <frame> tag and returns the results of parsing
# the tag and its attributes; if the parse fails (that is, if the
# string contains something that is not a <frame> tag), the second
# parse action will throw an exception, which will cause the stringExpr
# expression to fail
stringExpr = qs + ZeroOrMore( PLUS + (ident | qs))
stringExpr.setParseAction(lambda toks : ''.join(toks))
stringExpr.addParseAction(lambda toks: 
    frameTag.parseString(toks[0],parseAll=True))

# finally, define the overall document.write(...) expression
docWrite = "document.write" + LPAR + stringExpr + RPAR

# scan through the source looking for document.write commands containing
# <frame> tags using scanString; print the original source fragment, 
# then access some of the attributes extracted from the <frame> tag
# in the quoted string, using either object-attribute notation or 
# dict index notation
for dw,locstart,locend in docWrite.scanString(jssrc):
    print jssrc[locstart:locend]
    print dw.name
    print dw["src"]
    print

印刷：

document.write('<frame name="nav" src="/nav/index_nav.html" marginwidth="0" marginheight="0" scrolling="no" frameborder="0" border = "no" noresize>')
nav
/nav/index_nav.html

document.write('<frame name="body" src="http://content.members.fidelity.com/mfl/summary/0,,' + cusip + ',00.html?' + anchor + '" marginwidth="0" marginheight="0" scrolling="auto" frameborder="0" noresize>')
body
http://content.members.fidelity.com/mfl/summary/0,,CUSIP,00.html?ANCHOR

document.write('<frame name="body" src="http://content.members.fidelity.com/mfl/summary/0,,' + cusip + ',00.html" marginwidth="0" marginheight="0" scrolling="auto" frameborder="0" noresize>')
body
http://content.members.fidelity.com/mfl/summary/0,,CUSIP,00.html
于 2009-12-10T21:10:57.820 回答