anchor.diff:    });
     if (tag=='true') {
      // print('oktologin');
  +    stuID = Username;
      }
     else {print ('error');}
     return tag;
  
positive.code: List twoList = new List();
  List<String> messageList = new List();
  var time = new DateTime.now();
  
  
  main() async{
  
negative.code: 
  getMyclass(HttpRequest request) async{   //获取我的课程列表
    var pool=new ConnectionPool(host: '52.8.67.180', port: 3306, user: 'dec2013stu', password: 'dec2013stu', db: 'stu_10130340211');
    var results = await pool.query('select curriculumname from curriculum where curriculumID in (select curriculumID from xuanke where studentID = "${stuID}")');
    var tearesults = await pool.query('select teachername from teacher where teacherID in(select teacherID from curriculum where curriculumID in (select curriculumID from xuanke where studentID = "${stuID}"))');
    //需把登陆页面获得的学号替换掉select里的101
    await results.forEach((row) {
      classList.add('"${row[0]}"');
  