Miltiply-pointer is a webpage that does multiplication on clicking a button, utilizing Javascript -> C++ -> Javascript function chain. The project uses Emscripten, to compile a C++ file to Webassembly, i.e., .wasm and .js, and run it from an html file.
Build a server where the files are located and you are ready to go.
./build.sh //On Linux
build.bat //On Windows
If you want to build the project from build files you would need to install Emscripten from http://kripken.github.io/emscripten-site/docs/getting_started/downloads.html
The project can be installed into local server directly with the files available in gh-pages branch.