Prototype实战教程----3.$F
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html> <head> <title>$F</title> <script type="text/javascript" language="javascript" src="prototype.js" ></script> <script type="text/javascript" language="javascript"> function test() { alert($F("userName")); } </script> </head> <body> <form> <input type="text" id="userName" value="test username"> <input type="button" value="click" > </form></html>
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