问题
I wrote one Greasemonkey/Tampermonkey script for Facebook . I needed to store data to retrieve it later. For that I used localStorage.
That was working fine. But I noticed that after few hours all data which I stored was removed automagicllay. Probably Facebook itself deletes all localStorage data.
Now, I searched for alternatives.
- Cookies : No this will be removed when user clears history.
- Web SQL : Apparently it is dropped by w3.org. So in near future I assume chrome might not be using web sql too.
I want to store the data in client system. What option do I have? Should I use FileSystem to store data?
回答1:
Since you are using Tampermonkey (Chrome) and Greasemonkey (Firefox). Go ahead and use GM_setValue(). It cannot be cleared by Facebook or by any other website.
It has the advantage of storing values cross-domain, as well.
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Beware that the bog-standard GM_setValue() is somewhat problematic on Firefox. It can cause a script instance to crash on invalid values -- So it's best to use a serializer, such as GM_SuperValue, to store anything but strings. Even innocent-looking integers can cause the default GM_setValue() to crash.
Currently, only GM_setValue(), cookies, localStorage, and IndexedDB are available for persistent data on both browsers.
IndexedDB would also probably do what you want, but it is nowhere as easy to use as GM_setValue().
Update:
Nowadays, don't forget to use:
// @grant GM_setValue
and// @grant GM_getValue
Also, if you do use the GM_SuperValue library, you would now add it with:
// @require http://userscripts-mirror.org/scripts/source/107941.user.js
in the metadata block. (Since userscripts.org is long dead.)
来源：https://stackoverflow.com/questions/15730216/how-where-to-store-data-in-a-chrome-tampermonkey-script