# package errors `import "errors"` errors包實現了創建錯誤值的函數。 Example ``` package errors_test import ( "fmt" "time" ) // MyError is an error implementation that includes a time and message. type MyError struct { When time.Time What string } func (e MyError) Error() string { return fmt.Sprintf("%v: %v", e.When, e.What) } func oops() error { return MyError{ time.Date(1989, 3, 15, 22, 30, 0, 0, time.UTC), "the file system has gone away", } } func Example() { if err := oops(); err != nil { fmt.Println(err) } // Output: 1989-03-15 22:30:00 +0000 UTC: the file system has gone away } ``` ## Index * [func New(text string) error](#New) ### Examples * [New](#example-New) * [New (Errorf)](#example-New--Errorf) * [package](#example-package) ## func [New](https://github.com/golang/go/blob/master/src/errors/errors.go#L9 "View Source") ``` func New(text string) error ``` 使用字符串創建一個錯誤,請類比fmt包的Errorf方法，差不多可以認為是New(fmt.Sprintf(...))。 Example ``` err := errors.New("emit macho dwarf: elf header corrupted") if err != nil { fmt.Print(err) } ``` Output: ``` emit macho dwarf: elf header corrupted ``` Example (Errorf) ``` const name, id = "bimmler", 17 err := fmt.Errorf("user %q (id %d) not found", name, id) if err != nil { fmt.Print(err) } ``` Output: ``` user "bimmler" (id 17) not found ```