參考:html
http://www.w3.org/2002/09/tests/keys-cancel2.html web
http://www.w3.org/TR/DOM-Level-3-Events/#h-code-examples api
http://www.w3.org/2008/webapps/wiki/KeyCode_and_charCode app
https://lists.w3.org/Archives/Public/www-archive/2006Nov/att-0047/keyCode-ie.htm webapp
https://lists.w3.org/Archives/Public/public-webapi/2006Nov/0050.html code
http://people.w3.org/rishida/utils/keyevents/htm