javascript - In what situation we must use localstorage instead of the cookies?

I'm trying to develop a html5 mobile web application using the
sencha touch. I need to save client's data in browser storage for a long time. At first
i used a localstorage to save them. But my colleague recommended to use cookies instead
of the localstorage. I need to warn you that i don't use user's data in server-side and
size of data is small. What should i use localstorage or cookies in this
case?

Answer

I think in this situation local Storage would
do better,because

1. Cookies
   are used by server side and you said ,you don't use users's data in server
   side.


2. Your data size is small and you need to store it
   for long time,cookie has expiration date,but with local storage there is no such,either
   you have remove it programmatic-ally using java script or by clearing browser
   cache.