There are about 5 more spawners after this picture, then we deleted it to make something better. But here is our first enderman farm before we took it down. http://gyazo.com/6a26424753905265162c1b77b4b60816
Just go up to something that't 2 blocks high, they'll walk against it and not walk around to get up. Then hit them :) If they tp to get up, just run off (you're faster than an enderman xD) and repeat Or just walk into water (lava will work too :D) Or one of the suggestions posted by others
It removed the pumpkin view, so you can see the mob without the pumpkin POV blocking your sight. I think it's F1, I haven't played Minecraft in over a year. I'm just getting back into it.
under eachother... If I list things like this I say it as a number of different possibilities to do something