$(‘.selector‘).attr("checked", true);

            <s:iterator value="http://www.mamicode.com/jobSelect" id="jobLink2">                  <s:iterator value="http://www.mamicode.com/jobLink2" id="job2">                                  var arr = $(‘.selector‘);                  var a = ${job2.id};                  $(‘.selector‘).each(function(){                                        if($(this).val()== ${job2.id}){                       $(this).attr("checked", true);                     }               });                 </s:iterator>            </s:iterator>