异常处理

panic 抛出异常

recover 捕获异常

func receivePanic()  {
    defer func() {
        message := recover()
        fmt.Println("panic message:",message)
    }()
    panic("I am panic")
}

换种写法

func receivePanic()  {
    defer coverPanic()
    panic(errors.New(" this is error "))
}

func coverPanic()  {
    message := recover()
    switch message.(type) {
    case string:
        fmt.Println("string message: ",message)
    case error:
        fmt.Println("error message:",message)
    default:
        fmt.Println("unknown panic",message)
    }
}