二、go Defer

package mainimport (   "fmt"   "os")func main()  {   f:=createFile("D:\\webfront\\defer.txt")   defer closeFile(f)   writeFile(f)}func createFile(p string) *os.File{   fmt.Println("creating")   f,err :=os.Create(p)   if err!=nil {      panic(err)   }   return  f}func writeFile(f *os.File){   fmt.Println("writing")   fmt.Fprintln(f,"data")}func closeFile(f *os.File){   fmt.Println("closing")   f.Close()}