文件名称:avgscore
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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 passengers, calculating the grade point average • 0-59: fail • 60-79 • 80-89: good • 90-100.: Pass: excellent
• 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 passengers, calculating the grade point average • 0-59: fail • 60-79 • 80-89: good • 90-100.: Pass: excellent
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avgscore.html