It's all about who is able to get their VM in the most places; Java already lost that battle and Flash is on the way out.
It seems like JavaScript is the new ActionScript.
It seems like JavaScript is the new ActionScript.
Not even close.
The browser itself used to be too slow for many use cases which led to Flash filling in the gap, but thankfully that's rapidly changing with improved JIT VMs and HTML5 standardization efforts (WebRTC e.a.) all leading to the eventual demise of Flash.
Hence; JavaScript is the new ActionScript.
P.S. They're both just ECMAScript flavors so in that sense I would say they're very close ;)
Not really. That just happens to be the most common use of it.