There is a similar question asked in this post: Does javascript work on mobile phones?
The problem is this question was asked in 2009, what are the javascript support for mobile devices nowadays?
Basically as much as you could want. Most mobile phones are running some version of WebKit (what Chrome runs on), so you're pretty much guaranteed better support than IE8 provides if you're developing for mobile.
Edit: What Joe Tuskan said. :)
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