html - How can a CSS id style be accessed in jquery? -

I'm new to jquery and do not know how to add CSS ID to a page element.

  #main h2 {background: url (open.png) no-repeat 0% 10%; Padding-left: 20px; Cursor: indicator; } #hahana h2.close {background-image: url (close.png); } #hana h2.highlight {color: red; font-weight: bold; Text-transform: uppercase; }    And here I have tried jquery:  
  $ (document) .ready (function () {$ ("h2"). AddClass ( '#main h2.highlight');    It certainly works with orbits but I can not understand how to get the styles on the h2 tag.  
 
  Here's a lame, but:  
  $ ('# main h2' ) AddClass ('Highlight');     Highlight  class to  & lt; h2 & gt;  element  < / Em> will add (descendant) ID  main  Element Elements  Effectively  & lt; h2 & gt;  make rules to rule (rules)  #main h2.highlight .  Does this object If not, please note.   

 


  







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