要求输出到document对象，使用switch，实现接收输入成绩等级反馈，并统计输入人次，计算平均成绩 • 0-59: fail • 60-79: pass • 80-89: good • 90-100: excellent-Request output to the document object, use the switch, grades receive input feedback and statistical input p

VECMS网站内容管理系统基于《GPL协议》，大家可以免费的下载、使用、传播和修改，本版本用SpeedPHP3.1.89作为引擎驱动。-CMS website content management system based on GPL agreement , you can free to download, use, distribute and modify the version with SpeedPHP3.1.89 as an engine driver.

SpeedPHP是一款全功能的国产PHP应用框架系统。她以“快速开发、快速学习、快速运行”为理念，教程众多，入门容易，号称最适合初学者的PHP框架，快速带你进入PHP高手的行列。-SpeedPHP is a full-featured domestic PHP application framework system. Her rapid development, rapid learning, fast running concept, tutorials, easy entry, kno

SpeedPHP是一款全功能的国产PHP应用框架系统。她以“快速开发、快速学习、快速运行”为理念，教程众多，入门容易，号称最适合初学者的PHP框架，快速带你进入PHP高手的行列。-SpeedPHP domestic PHP application framework is a full-featured system. She ' rapid development, fast learning, fast run " for the idea, many tutorials, g