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" onclick="test()">
</form>
</html>
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