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JS - no - certain spiders actively hunt out java script links and that includes string builds and eval executes aswell.
"on site a link it to redirect" - no - absolutely NO links <href> or calls to Jscripts can be seen by the bots.
nofollow - can be seen by the spiders - essentially you are potentially telling them you have something to hide.
The bots are a LOT smarter than peeps think.
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