setup.md

1. delete <script src=/js/chunk-vendors.js></script> in index.html
2. add importScripts('http://localhost:8000/js/chunk-common.js'); importScripts('http://localhost:8000/js/chunk-vendors.js'); to worker.js
3. add var window={} to chunk-common.js
4. modify ./worker.js to ./js/worker.js in index.js