swift中的switch case语句中，多个case放在一起的写法，不是：
switch xxx{
case 1:
case 2:
yyyy
}官网的：
let anotherCharacter: Character = "a"
switch anotherCharacter {
case "a":
case "A":
print("The letter A")
default:
print("Not the letter A")
}
// this will report a compile-time error搜：
swift for in range
参考官网：
而是：
switch some value to consider {
case value 1, value 2:
statements
}而类似于continue，则用fallthrough：
let integerToDescribe = 5
var description = "The number \(integerToDescribe) is"
switch integerToDescribe {
case 2, 3, 5, 7, 11, 13, 17, 19:
description += " a prime number, and also"
fallthrough
default:
description += " an integer."
}
print(description)
// prints "The number 5 is a prime number, and also an integer."
［总结］
swift中switch的多个case在一起，则用逗号分隔开即可；
而如果想要实现类似于continue的效果，则加上fallthrough。
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