.ajax方法获取JSON数据

        $.ajax({

            url:

            data: {S_CourseID: courseid , CurrTime : new Date().getTime()}, //加个时间戳，否则会不自动更新数据

            dataType: 'json',

            success: function(data)

            {

           

                if (data != null) {

               

                    if ( data.length > 0) {

                   

                         for(var i = 0 ; i < data.length ; i++){

                   

                            specids = specids + data[i].S_SpecialtyID + ","; //获取JSON对象中的数据

                            

                            coursetypeid = data[i].S_CourseTypeID ;

                   

                        }

                       

                        if (specids.length >0) {

                           

                            specids = specids.substring(0,specids.length-1);

                       

                        }

                   

                    }