做个练习

添加客户：

查看客户和删除客户：

修改客户：

package main

import (
	"bufio"
	"fmt"
	"os"
	"strings"
)

// 构建数据存储结构
var customers []map[string]interface{}
var customersId int

func findById(id int) int {
	index := -1
	//遍历this.customers切⽚
	for i := 0; i < len(customers); i++ {

		if customers[i]["cid"] == id {
			index = i
		}
	}
	return index
}

func isBack() bool {
	// 引导用户选择继续还是返回
	fmt.Print("请问是否返回上一层【Y/N】:")
	var backChoice string
	fmt.Scan(&backChoice)

	if strings.ToUpper(backChoice) == "Y" {
		return true
	} else {
		return false
	}
}

func inputInfo() (string, string, int8, string) {
	var name string
	fmt.Print("请输入客户姓名：")
	fmt.Scan(&name)

	var gender string
	fmt.Print("请输入客户性别：")
	fmt.Scan(&gender)

	var age int8
	fmt.Print("请输入客户年龄：")
	fmt.Scan(&age)

	var email string
	fmt.Print("请输入客户邮箱：")
	fmt.Scan(&email)

	return name, gender, age, email
}

func addCustomer() {
	for true {
		// 引导用户输入学号和姓名
		fmt.Printf("\033[1;35;40m%s\033[0m\n", "---------------------------添加客户开始-----------------------------")
		name, gender, age, email := inputInfo()
		// 创建客户的map对象
		customersId++ // 客户编号不需要输入，系统自增即可
		newCustomer := map[string]interface{}{
			"cid":    customersId,
			"name":   name,
			"gender": gender,
			"age":    age,
			"email":  email,
		}
		// 添加客户map对象添加到客户切片中
		customers = append(customers, newCustomer)
		fmt.Printf("\033[1;35;40m%s\033[0m\n", "---------------------------添加客户完成-----------------------------")
		b := isBack()
		if b {
			break
		}
	}
}

func listCustomer() {
	for true {
		fmt.Printf("\033[1;32;40m%s\033[0m\n", "----------------------------------客户列表开始-----------------------------------")
		for _, customer := range customers {
			fmt.Printf("编号：%-8d 姓名：%-8s 性别：%-8s 年龄：%-8d 邮箱：%-8s \n",
				customer["cid"], customer["name"], customer["gender"], customer["age"], customer["email"])
		}
		fmt.Printf("\033[1;32;40m%s\033[0m\n", "----------------------------------客户列表完成-----------------------------------")
		b := isBack()
		if b {
			break
		}
	}
}

func updateCustomer() {
	fmt.Printf("\033[1;36;40m%s\033[0m\n", "---------------------------客户修改开始----------------------------")
	for true {
		var updateCid int
		fmt.Print("请输入更新客户编号：")
		fmt.Scan(&updateCid)
		updateIndex := findById(updateCid)
		if updateIndex == -1 {
			fmt.Println("删除失败，输入的编号ID不存在")
			continue
		}
		fmt.Println("请输入修改客户的信息")
		name, gender, age, email := inputInfo()

		customers[updateIndex]["name"] = name
		customers[updateIndex]["gender"] = gender
		customers[updateIndex]["age"] = age
		customers[updateIndex]["email"] = email

		fmt.Printf("\033[1;36;40m%s\033[0m\n", "---------------------------客户修改完成----------------------------")
		b := isBack()
		if b {
			break
		}
	}
}

func deleteCustomer() {
	fmt.Printf("\033[1;31;40m%s\033[0m\n", "---------------------------删除客户开始----------------------------")
	var delCid int
	fmt.Print("请输入删除客户编号：")
	fmt.Scan(&delCid)

	delIndex := findById(delCid)
	if delIndex == -1 {
		fmt.Println("删除失败，输入的编号ID不存在")
		return
	}

	customers = append(customers[:delIndex], customers[delIndex+1:]...)
	fmt.Printf("\033[1;31;40m%s\033[0m\n", "---------------------------删除客户完成----------------------")
}

var data = make(map[string]map[string]string)

func main() {
	for true {
		fmt.Printf("\033[1;33;40m%s\033[0m\n", `

----------------客户信息管理系统--------------

   1、添加客户
   2、查看客户
   3、更新客户
   4、删除客户
   5、退出
-------------------------------------------
`)

		var choice int
		fmt.Printf("\033[1;38;40m%s\033[0m", "请输入选择【1-5】:")
		stdin := bufio.NewReader(os.Stdin)
		fmt.Fscan(stdin, &choice)

		switch choice {
		case 1:
			addCustomer()
		case 2:
			listCustomer()
		case 3:
			updateCustomer()
		case 4:
			deleteCustomer()
		default:
			fmt.Println("非法输入！")
			os.Exit(0)
		}
	}
}