1. go build -o cmd a.go
2. ./cmd -h
3. ./cmd -name=golanm m123g -age 4 -vip=true -pop 99 简洁 高并发 等等 asdfasfdaf adfa safa adfa fafda adfsafsaf 111111111111111
package main import "flag" import "fmt" import "strconv" type percentage float32 func (p *percentage) Set(s string) error { v, err := strconv.ParseFloat(s, 32) *p = percentage(v) return err } func (p *percentage) String() string { return fmt.Sprintf("%f", *p) } func main() { namePtr := flag.String("name", "lyh", "user's name") agePtr := flag.Int("age", 22, "user's age") vipPtr := flag.Bool("vip", true, "is a vip user") var email string flag.StringVar(&email, "email", "lyhopq@gmail.com", "user's email") var pop percentage flag.Var(&pop, "pop", "popularity") flag.Parse() others := flag.Args() fmt.Println("name:", *namePtr) fmt.Println("age:", *agePtr) fmt.Println("vip:", *vipPtr) fmt.Println("pop:", pop) fmt.Println("email:", email) fmt.Println("other:", others) }