GO如何生成4~6位数字短信验证码？
func GenValidateCode(width int) string {
numeric := [9]byte{0,1, 2, 3, 4, 5, 6, 7, 8, 9}
r := len(numeric)
rand.Seed(time.Now().UnixNano())
var sb strings.Builder
for i := 0; i < width; i++ {
fmt.Fprintf(&sb, "%d", numeric[rand.Intn(r)])
}
return sb.String()
}使用说明：
width 验证码长度
如 4位GenValidateCode(4)
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