golang 读取递归文件夹下所有文件

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package main   import (     "fmt"     "io/ioutil" )   func main() {     dirName := "D:\\tmp\\20220314"     //fmt.Println(dirName)     res := FileList(dirName, 0)     for _, file := range res {         fmt.Println(file)     }       }   func FileList(dirName string, level int) []string {     /*         根据层级读取目录下文件  并返回list     */     s := "|--"     for i := 0; i < level; i++ {         s = "|  " + s     }     var ret []string     fileInfo, err := ioutil.ReadDir(dirName)     if err != nil {         fmt.Println(err)         return ret     }     for _, fi := range fileInfo {         fileName := dirName + "/" + fi.Name()         fmt.Printf("%s%s\n", s, fileName)         if fi.IsDir() {             tmpRes := FileList(fileName, level+1)             ret = append(ret, tmpRes...)         } else {             ret = append(ret, fileName)         }     }     return ret }