For Developing local the same Origin Policy from Chrome can disturb the development process . Changing some Chrome Flags help to work on your local host without that error
With disabled Flags you can make Ajax request to other domains for testing keep in mind Chrome is running in insecure mode . Alternative you can make a second Shortcut for chrome to load your Developer version with that Flags disabled.
For MAC /Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome –allow-file-access-from-files –disable-web-security