cookie值進行編碼的document.cookie

Question

我有一個cookie的值是

emailID=a1%40a.comSEPmaths=0SEPphysics=0SEPchemistry=0SEPbotany=0SEPzoology=0SEPta 
mil=0SEPenglish=0SEPpolity=0SEPgk=0SEPhistory=0 

但document.cookie.split('; ')回報

subs=emailID%3Da1%2540a.comSEPmaths%3D0SEPphysics%3D0SEPchemistry%3D0SEPbotany%3 
D0SEPzoology%3D0SEPtamil%3D0SEPenglish%3D0SEPpolity%3D0SEPgk%3D0SEPhistory%3D0" 

爲什麼編碼？如果沒有編碼，它是什麼？如何獲得我在瀏覽器的Cookie選項卡下看到的確切值。

Answer 1

它被編碼，因爲在cookie值中允許only certain characters。

cookie-value  = *cookie-octet/(DQUOTE *cookie-octet DQUOTE) 
cookie-octet  = %x21/%x23-2B/%x2D-3A/%x3C-5B/%x5D-7E 
         ; US-ASCII characters excluding CTLs, 
         ; whitespace DQUOTE, comma, semicolon, 
         ; and backslash 

與decodeURIComponent解碼。