public function showClassDetails($classId)
 {
     //inst_Id
     $tId = session('instId');
     $class = new \Home\Model\ClassModel();
     $classInfo = $class->showClassById($classId, $tId);
     $classDetails = $class->showClassDetails($classId, $tId);
     $this->assign('classInfo', $classInfo);
     $this->assign('classDetails', $classDetails);
     //记录编号
     $pnum = 0;
     $this->assign("pnum", $pnum);
     $teacher = new \Home\Model\TeacherModel();
     $teacherList = $teacher->showTeachers($tId, 0, 50);
     $this->assign("teacherList", $teacherList);
     $tnum = 0;
     $this->assign("tnum", $tnum);
     $classroom = new \Home\Model\ClassroomModel();
     $classroomList = $classroom->showClassrooms($tId, 0, 20);
     $this->assign("classroomList", $classroomList);
     $clnum = 0;
     $this->assign("clnum", $clnum);
     $student = new \Home\Model\StudentModel();
     $studentList = $student->showStudents($tId, 0, 500);
     for ($i = 0; $i < count($studentList); $i++) {
         $captial = substr($studentList[$i]['pinyin'], 0, 1);
         $studentList[$i]['capital'] = $captial;
     }
     $this->assign("studentList", $studentList);
     $snum = 0;
     $this->assign("snum", $snum);
     layout(true);
     $this->display();
 }