js json数组

    var trueAnswer = $("#trueAnswer").val();

        var trueAnswerArray = JSON.parse(trueAnswer);

        for(var i=0,l=trueAnswerArray.length;i<l;i++){ 

            $("[name='rightAnswer']").each(function(data){

                var answer =$(this).val();

                if(trueAnswerArray[i]==answer){

                    $(this).prop("checked",true);

                }

            });

        }