Swift-Switch穿透

switch vegetable {
case "celery":
print("Add some raisins and make ants on a log.")
case "cucumber", "watercress":
print("That would make a good tea sandwich.")
case let x where x.hasSuffix("pepper"):
print("Is it a spicy \(x)?")
fallthrough
case "red pepper":
print("你妹啊")
default:
print("Everything tastes good in soup.")
}
fallthrough所在的case中fallthrough后面的语句不在执行,直接执行下一个case,且下一个case判断语句要符合规则