How to make an javascript row link nofollow?

How do I make my javascript row link a nofollow link?

<tr class="thumbnail-item" onclick="window.open('<%= vind.tracking %>')" 开发者_StackOverflow中文版>

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You can't, but since search engines ignore JavaScript, that really doesn't matter.

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You can have the url go trough a redirector that is blocked in robots.txt.

If you want to link to google.com then you'll open yoursite.com/blocked.php?url=google.com, and have the url yoursite.com/blocked.php blocked in robots.txt. blocked.php will then redirect to the specified url parameter, but will be blocked for crawlers. F.ex:

User-agent: *
Disallow: /blocked.php

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