多项选择题
A.AbsB.3aC.IfD.a3
A.session中的userIDB.cookieC.requestD.application
A.var $obj =$(’ul li’);alert($obj.length());B.var $obj =$(’li’);alert($obj.length);C.var $obj =$(’#li’);alert($obj.length());D.var $obj =$(’#li’);alert($obj.length);