Google JSON解析的两个正则，没看明白：（

http://gmodules.com/ig/modules/json.js?ts=040408
这两个正则不知何意：（
谁有兴趣去研究一下？

 function parse(text) {
      try {
        return !(/[^,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]/.test(
//只允许某些申明符号，禁止运算元素;
//可非asii怎么办？{'value':"中文是合法的啊"}
//还有Eaeflnr-u   Eefnrtu可以理解  sa是什么呢？
            text.replace(/"(\\.|[^"\\])*"/g, ''))) &&//去掉字符串
          eval('(' + text + ')');
      } catch (e) {
        return false;
      }
    }

貌似一个简单的语法检查。
同时还要禁止运算逻辑？

是这样的，你可以看看 http://www.json.org/json2.js

...
// In the second stage, we run the text against
// regular expressions that look for non-JSON patterns. We are especially
// concerned with '()' and 'new' because they can cause invocation, and '='
// because it can cause mutation. But just to be safe, we want to reject all
// unexpected forms.

// We split the second stage into 4 regexp operations in order to work around
// crippling inefficiencies in IE's and Safari's regexp engines. First we
// replace all backslash pairs with '@' (a non-JSON character). Second, we
// replace all simple value tokens with ']' characters. Third, we delete all
// open brackets that follow a colon or comma or that begin the text. Finally,
// we look to see that the remaining characters are only whitespace or ']' or
// ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.

                if (/^[\],:{}\s]*$/.test(text.replace(/\\["\\\/bfnrtu]/g, '@').
replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']').
replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {
...

至于中文，json.org 的规范中是要求用 \uXXXX 的形式(utf-8编码)，不应该出现中文。

先做了text.replace(/"(\\.|[^"\\])*"/g, '')，然后再test，中文应该允许。parse期望的输入是stringify的结果，stringify处理的对象属性名都变成了“name”:...
Eaeflnr-u 这些字符做什么用的？

true
false
null
E(e)

不过这个版本貌似很老了，这个正则其实很偷懒，还是看json2.js那个好。

bfnrtu 《--- 这又是什么组合呢？

看代码注释呀。