packageerror_handleimport("github.com/pkg/errors")// 1、自定义error结构体,并重写Error()方法// 错误时返回自定义结构typeCustomErrorstruct{Codeint`json:"code"`// 业务码TagMessagestring`json:"message"`// 描述信息}func(e*CustomError)Error()string{returne.TagMessage}// 2、定义errorCodeconst(//...
可以看出原生的error非常简单,只有msg,但是一般业务开发上,我们还需要code信息。根据go 的接口设计,只要我们实现了Error() string 方法就可以实现自定义error。 自定义error 代码语言:javascript 复制 packageerrorsimport"fmt"type myErr struct{code int msg string}func(e myErr)Error()string{returnfmt.Sprintf("c...
resp, err := gcdmessage.SendCustomReturn(c.target, c.target.GetSendCh(), &gcdmessage.ParamRequest{Id: c.target.GetId(), Method:"DOM.pushNodesByBackendIdsToFrontend", Params: paramRequest})iferr !=nil{returnnil, err }varchromeDatastruct{ Resultstruct{ NodeIds []int} }ifresp ==nil...
In the program above, we check whether the radius is less than zero in line no. 10. If so we return zero for the area along with the corresponding error message. If the radius is greater than 0, then the area is calculated andnilis returned as the error in line no. 13. In the m...
defer里面的变量必须与函数定义的返回值变量是同一个变量才会在最后的时候return defer自执行函数操作后的结果。 不满足这个条件,return的结果就不是defer自执行函数操作后的结果。return变量的类型要和函数的返回值类型保持一致,不然会报编译错误。 用变量的内存地址来理解,真的一切都很easy了. ...
{return"error message"}functest(valint) (string,error) {return"",&MyError{Value:val, } }funcmain() {t:=template.Must(template.New("test").Funcs(template.FuncMap{"test":test, }).Parse("{{ test 10 }}"))err:=t.Execute(os.Stdout,nil)iferr!=nil{vare*MyErrorfmt.Println(errors.As...
func (c *bkClient) Do(r *http.Request) (*http.Response, error) { r.Header.Set("X-BK-TOKEN", token) return http.DefaultClient.Do(r) } // 创建自定义的 metric var ( // counter counter = prometheus.NewCounter(prometheus.CounterOpts{ ...
func(g*Game)Update()error{ ifg.gameOver{ returnnil } // 玩家控制挡板 ifebiten.IsKeyPressed(ebiten.KeyLeft) { g.paddleX-=5 ifg.paddleX<0{ g.paddleX=0 } } ifebiten.IsKeyPressed(ebiten.KeyRight) { g.paddleX+=5 ifg.paddleX>ScreenWidth-PaddleWidth{ ...
Compress the data, that is, the compression function and the custom encryption and tls|kcp can be used in combination, and the compression is divided into two parts. Part of it is local (-m) compression transmission, and part is whether the transmission with the upstream (-M) is compressed...
EOF is the error returned by Read when no more input is available.Functions should return EOF only to signal a graceful end of input.If the EOF occurs unexpectedly in a structured data stream,the appropriate error is either ErrUnexpectedEOF or some other error↩ ...