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HomeBackend DevelopmentPython TutorialPython中还原JavaScript的escape函数编码后字符串的方法

遇到一个问题需要用Python把JavaScript中escape的中文给还原,但找了大半天,也没有找到答案,只好自己深入研究解决方案。
我们先来看在js中escape一段文字的编码

复制代码 代码如下:

a = escape('这是一串文字');
alert(a);

输出:
复制代码 代码如下:

%u8FD9%u662F%u4E00%u4E32%u6587%u5B57

咋一看,就感觉有点类似json格式,我们来看看标准的json格式编码同样的汉子“这是一串文字”
复制代码 代码如下:

# encoding=utf-8
import json
a = '这是一串文字'
print json.dumps(a)

输出:
复制代码 代码如下:
"\u8fd9\u662f\u4e00\u4e32\u6587\u5b57"
经过对比,其实就是js escape编码每个汉子都是“%u”符号加4位字符编码,而json编码每个汉子都是“\u”符号加4位字符编码,这样的话,我们可以利用字符串替换操作还原json格式,然后再使用json模块loads就好
复制代码 代码如下:

# encoding=utf-8
import json
 
# js escape 字符串编码
c = '%u8FD9%u662F%u4E00%u4E32%u6587%u5B57'
 
# 还原Json对象
jsonObj =  '"'+"".join([(i and "\\"+i) for i in c.split('%')])+'"'
 
print json.loads(jsonObj)

特别记得在把“%”替换为“\”符号以后还要再使用双引号把字符串包一下,才能算是一个json对象,然后才能json.loads出来
后来,好不容易在一个站点上看到了更简便的方法。代码如下:
复制代码 代码如下:

# encoding=utf-8
c = '%u8FD9%u662F%u4E00%u4E32%u6587%u5B57'
print "".join([(len(i)>0 and unichr(int(i,16)) or "") for i in c.split('%u')])

它的思路其实都差不多,把“%u”号替换掉,剩下每一个都是4位固定长度的字符编码,最后在unichr反编码回中文字符。
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