要求对输入成绩的操作要有有效性检验。成绩只接受大于0且小于100的数字；同一记录不能反复提交；

当点击“提交”，告知用户操作是否成功，并给出相应信息；课程名下拉列表中的课程列表根据数据库中的课程表，自动生成。-Validation should be required to enter grades. Results only accept greater than 0 and less than 100 figures　not repeatedly submit the same record　click " Submit"　to inform the user whether the operation was successful, and given the appropriate information　Course Name drop-down list of courses in the list according to the database curriculum automatically generated.