Follow the instructions to get asciiflow running locally.

Compile the javascript:
~/asciiflow2$ ./compile.sh

If you get a permissions error:
~/asciiflow2$ chmod a+x closure-compiler.jar

Run a simple web server:
~/asciiflow2$python -m SimpleHTTPServer

Goto: http://localhost:8000/index.html

When developing, use the Google JS linter, gjslint.