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

经过数月的研究及发布版本经验。我们这次新出了3种调用格式，已经可以准确的获取345个国内城市、79个国外城市的天气预报。预报情况也由之前 V2.0版的 近期3天 升级至 最近5天 天气预报。-After the study and released version experience a few months. We have this new format out of the three kinds of calls, you can already get an accurate wea