출처 : http://thinkweb2.com/projects/prototype-checklist/ 1 The wrong way:document.getElementById('foo') The right way:$('foo') Surprisingly some people actually don't know about this one ( including ~100KB file just to use Ajax.Request family ) 2 The wrong way:var woot = document.getElementById('bar').valuevar woot = $('bar').value The right way:var woot = $F('bar') Handy shortcut for reading a v..