js的cookie处理2

在《JavaScript: The Definitive Guide, 4th Edition》中写到： 

In client-side JavaScript, a common use of escape( ) is to encode cookie values, which have restrictions on the punctuation characters they may contain. 
在客户端脚本程序中，escape( )函数可以被用作对具有不规范标点的cookie进行编码。（就像我们函数中所用到的一样） 

Although the escape( ) function was standardized in the first version of ECMAScript, it has been deprecated and removed from the standard by ECMAScript v3. Implementations of ECMAScript are likely to implement this function, but they are not required to. In JavaScript 1.5 and JScript 5.5 and later, you should use encodeURI( ) and encodeURIComponent( ) instead of escape( ). 
虽然escape( ) 已经在ECMAScript中被标准化，但是在ECMAScript v3中，escape( ) 被剔出，如果需要在JavaScript 1.5 和JScript 5.5以后的版本中使用这个函数，建议使用encodeURI( )和encodeURIComponent( )。 

按照手册的建议，修改JavaScript函数中的escape()和unescape()为encodeURI()和decodeURI()。