anchor.diff:    }
   
   void user_reset(Event e) {
  -  document.getElementById('user_sex').value="";
  -  document.getElementById('user_department').value="";
  -  document.getElementById('user_major').value="";
  -  document.getElementById('user_grade').value="";
  -  document.getElementById('user_dorm').value="";
  -  document.getElementById('user_email').value="";
  -  document.getElementById('user_tel').value="";
  +  querySelector('#user_sex').text="";
  + querySelector('#user_department').text="";
  + querySelector('#user_major').text="";
  +   querySelector('#user_grade').text="";
  +  querySelector('#user_dorm').text="";
  +   querySelector('#user_email').text="";
  +   querySelector('#user_tel').text="";
  +
   }
positive.code: void main() {
    var name=cookie.get('name');
    var password =cookie.get('password');
    document.getElementById('user_name').value = name.toString();
    list.add(name);
   querySelector("#save").onClick.listen(user_save);
   querySelector("#reset").onClick.listen(user_reset);
  
negative.code: }
  
  void user_save(Event e) {
    usersex_in = querySelector('#user_sex');
    userdepartment_in = querySelector('#user_department');
    usermajor_in = querySelector('#user_major');
    usergrade_in = querySelector('#user_grade');
    userdorm_in = querySelector('#user_dorm');
    useremail_in = querySelector('#user_email');
    usertel_in = querySelector('#user_tel');
  
    usersex = usersex_in.value;
    userdepartment = userdepartment_in.value;
    usermajor = usermajor_in.value;
    usergrade = usergrade_in.value;
    userdorm =  userdorm_in.value;
    useremail =useremail_in .value;
    usertel = usertel_in.value;
    list.add(usersex);
    list.add(userdepartment);
    list.add(usermajor);
  