<div class="zy_menu clearfix"> <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="1" id="assoeted1" class="hover_a">课件库</a> <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="2" id="assoeted2">课堂实录</a> <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="3" id="assoeted3">试题库</a> <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="4" id="assoeted4">教案库 </a> <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="5" id="assoeted5">素材库 </a> </div>
var assoeted =5;
$(".zy_menu a[rel="+assoeted+"]").removeClass("hover_a").addClass("hover_a");
$(".zy_menu a").removeClass("hover_a").eq(assoeted-1).addClass("hover_a");
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属性,index,查找属性值
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