go在同包下怎么访问不同文件下的变量

# 环境 Linux dan 4.15.0-91-generic #92-Ubuntu SMP Fri Feb 28 11:09:48 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux ## ./main.go ```go package main import ( "fmt" "net/http" ) func home(w http.ResponseWriter, r *http.Request) { _, _ = w.Write([]byte("<h1>地址为: " + r.URL.Path + " 你好,世界!</h1>")) //fmt.Printf("来访者: Method:%v Path:%v Scheme:%v \n", r.Method, r.URL.Path, r.URL.Scheme) } func show(w http.ResponseWriter, r *http.Request) { imgPath := getRandPath("/root/tp8") http.ServeFile(w, r, imgPath) } func main() { http.HandleFunc("/home", home) http.HandleFunc("/p", show) fmt.Println("服务器开启成功! http://localhost/home") err := http.ListenAndServe(":80", nil) if err != nil { panic(err) } } ``` ## ./t.go ```go package main import ( "fmt" "net/http" ) func home(w http.ResponseWriter, r *http.Request) { _, _ = w.Write([]byte("<h1>地址为: " + r.URL.Path + " 你好,世界!</h1>")) //fmt.Printf("来访者: Method:%v Path:%v Scheme:%v \n", r.Method, r.URL.Path, r.URL.Scheme) } func show(w http.ResponseWriter, r *http.Request) { imgPath := getRandPath("/root/tp8") http.ServeFile(w, r, imgPath) } func main() { http.HandleFunc("/home", home) http.HandleFunc("/p", show) fmt.Println("服务器开启成功! http://localhost/home") err := http.ListenAndServe(":80", nil) if err != nil { panic(err) } } root@dan:~/gocode/src/8niWang# cat t.go package main import ( "io/ioutil" "log" "math/rand" "time" ) func ReadAllDir(path string) { //path = strings.Replace(path, "/", "\\", -1) FileInfo, err := ioutil.ReadDir(path) if err != nil { log.Fatalln("读取文件夹出错") } // 多协程遍历目录 for _, fileInfo := range FileInfo { if fileInfo.IsDir() { ReadAllDir(path + "/" + fileInfo.Name()) } else { savePath(path + "/" + fileInfo.Name()) } } return } // 保存文件地址 var sPath []string var AA int func savePath(path string) { sPath = append(sPath, path) return } // 从文件切片里随机取一个文件地址 func getRandPath(path string) string { ReadAllDir(path) arrLen := len(sPath) rand.Seed(time.Now().Unix()) r := rand.New(rand.NewSource(time.Now().UnixNano())) return sPath[r.Intn(arrLen)] } //func main(){ // path := getRandPath("/root/tp8") // log.Println(path) //} ``` # 报错: go build main.go # command-line-arguments ./main.go:13:13: undefined: getRandPath