Before writing any Elm we need to first install the runtime locally. In this lesson we install the Elm runtime locally and set up a simple application to verify everything is working properly.
Install:
npm install -g elm
elm package install
elm package install elm-lang/html
Code:
//main.elm import Html exposing (text) main = text "Hello World!"
Run:
elm reactor
Go to localhost:8000 to see the website.
[Elm] Installing and setting up Elm
原文：http://www.cnblogs.com/Answer1215/p/6115356.html