試驗(yàn)了一下python的urllib庫以及js 的 encodeURIComponent 均不會(huì)替換。空格encode也是替換成了 '%20' 。python提供了urllib.quote_plus, urlib.unquote_plus來處理空格->加號，看起來還是比較合理的。 

查了一下 RFC 3986: 有下面一段 

Scheme names consist of a sequence of characters beginning with a letter and followed by any combination of letters, digits, plus ("+"), period ("."), or hyphen ("-"). 
RFC 2396 有下面的一段 

The plus "+", dollar "$", and comma "," characters have been added to those in the "reserved" set, since they are treated as reserved within the query component. 
表示加號已經(jīng)是url的保留字了，不需要轉(zhuǎn)義。 

然后html4文檔里才有關(guān)于加號的轉(zhuǎn)義： 

application/x-www-form-urlencoded 
Forms submitted with this content type must be encoded as follows: 
Control names and values are escaped. Space characters are replaced by`+', and then reserved characters..... 
聲明只有content-type為application/x-www-form-urlencoded時(shí)才會(huì)對+做轉(zhuǎn)義。 

又翻了下php的文檔，發(fā)現(xiàn)有一個(gè) 

rawurlencode() - URL-encode according to RFC 3986 


也就是php又搞了rawurlencode和rawurldecode把標(biāo)準(zhǔn)實(shí)現(xiàn)了。。。。 

不能反一下么，畢竟大部分人應(yīng)該都會(huì)用urlencode。php真是蛋疼啊。。。。