* error: 可預見的錯誤 * pannic: 不可預見的異常 * pannic 和 defer 打印順序 ： pannic 后終止后續代碼執行， 按后進先出順序打印defer 最后再打印pannic ~~~ package main //https://blog.golang.org/defer-panic-and-recover import "fmt" func main() { f() fmt.Println("Returned normally from f.") } func f() { defer func() { if r := recover(); r != nil { fmt.Println("Recovered in f", r) } }() fmt.Println("Calling g.") g(0) fmt.Println("Returned normally from g.") } func g(i int) { if i > 3 { fmt.Println("Panicking!") panic(1) //panic 中止了當前函數，逐級回溯直至在 defer 中遇到 recover 后恢復。 } defer fmt.Println("Defer in g", i) fmt.Println("Printing in g", i) g(i + 1) } ~~~