与我们以前接触过的switch 控制语句不同，GoLang 的switch 语句使用更灵活。
简单使用示例
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score := 79
switch score / 10 {
case 9:
rz = "优秀"
fallthrough // 表示继续执行下面的Case而不是退出Switch
case 8:
rz = "良好"
case 7:
rz = "一般"
break //可以添加
case 6:
rz = "及格"
default:
rz = "不及格"
}
使用说明：
- switch 的判断条件可以是任何数据类型
- 在每个case 里可以不用break 退出，默认退出
- 可以通过关键字
fallthrough让switch不退出，而继续判断下面的case
如果多个匹配结果所对应的代码段一样，则可以在一个case中并列出所有的匹配项
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switch ch {
case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
cl = "Int"
case 'A', 'B', 'C', 'D', 'a', 'b', 'c', 'd', 'e':
cl = "ABC"
default:
cl = "Other Char"
}
switch可以没有表达式，在 Case 中使用布尔表达式，这样形如 if-else
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func GetConstellation(month, day int) (star string) {
switch {
case month <= 0, month >= 13, day <= 0, day >= 32:
star = "-1"
case (month == 1 && day >= 20), (month == 2 && day <= 18):
star = "水瓶座"
case (month == 2 && day >= 19), (month == 3 && day <= 20):
star = "双鱼座"
case (month == 3 && day >= 21), (month == 4 && day <= 19):
star = "白羊座"
case (month == 4 && day >= 20), (month == 5 && day <= 20):
star = "金牛座"
case (month == 5 && day >= 21), (month == 6 && day <= 21):
star = "双子座"
case (month == 6 && day >= 22), (month == 7 && day <= 22):
star = "巨蟹座"
case (month == 7 && day >= 23), (month == 8 && day <= 22):
star = "狮子座"
case (month == 8 && day >= 23), (month == 9 && day <= 22):
star = "处女座"
case (month == 9 && day >= 23), (month == 10 && day <= 22):
star = "天秤座"
case (month == 10 && day >= 23), (month == 11 && day <= 21):
star = "天蝎座"
case (month == 11 && day >= 22), (month == 12 && day <= 21):
star = "射手座"
case (month == 12 && day >= 22), (month == 1 && day <= 19):
star = "魔蝎座"
}
return
}