I am trying to work some of the illustrated examples to get a
better feel on how they function. Presently I am having trouble
with a portion of the hasClass from page 88.  I retyped the code
to be a simple function:  function has(target, theClass) {  var
pattern = new RegExp("(^| )" + theClass + "( |$)");  if
(pattern.test(target.className)) { return true;  return false;
then in a html doc I have this:  <body onload='has("h3",
"red");'>  <p class="red">I should be white background black
text</p> <h7>no class</h7> <h3 class="red">Some class</h3>   If
I understand correctly I thought target.className would get the
class name of the element passed to it, thus I expected to have
the function return True, but I consistently get False. I got
False whether I put in an element with the class or without it.
I then put the alert(target.className) in to see what the value
was showing has and I get "Undefined". So presently I am not
sure if I am doing something incorrect or it maybe that I don't
have a proper understand