$.ajax({             url: '这个地址要换成你自己的',             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);                         }                     }