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Go基础学习笔记

  • 2026-05-02 07:28:32
Go基础学习笔记

📖 目录

  1. 🌱 Go语言简介
  2. 🛠️ 开发环境搭建
  3. 👶 第一个Go程序
  4. 📝 基本语法
  5. 📊 数据类型
  6. 🎮 控制流程
  7. 🔧 函数
  8. 📦 包和模块
  9. 🏗️ 结构体和方法
  10. 🔌 接口
  11. 🧵 并发编程
  12. ❌ 错误处理
  13. 🧰 常用标准库

1. 🌱 Go语言简介

1.1 什么是Go?

Go(又称Golang)是由Google开发的静态类型、编译型、并发式编程语言,诞生于2009年。它结合了Python的开发效率和C语言的性能优势,特别适合构建高性能的分布式系统。

1.2 Go的六大核心优势

  • 🚀 简洁高效:语法简单,学习曲线平缓
  • ⚡ 高性能:编译成机器码,执行效率高
  • 🧵 并发支持:原生支持goroutine和channel
  • 🗑️ 垃圾回收:自动内存管理
  • 🌐 跨平台:支持多平台编译
  • 🔒 静态类型:编译时类型检查,安全性高

1.3 Go的典型应用场景

  • 🖥️ 服务器端开发
  • ☁️ 云原生/容器化应用(Docker、Kubernetes)
  • 🌐 网络编程
  • 📊 分布式系统
  • ⌨️ 命令行工具
  • 🛠️ 微服务架构

2. 🛠️ 开发环境搭建

2.1 安装Go

macOS(Homebrew)🍎

  1. brew install go

Windows(winget)🪟

  1. winget install GoLang.Go

验证安装 ✅

  1. go version

2.2 推荐IDE

  • 💻 VS Code:安装Go扩展(最轻量)
  • 🚀 GoLand:JetBrains出品,功能强大
  • 🧙 Vim/Neovim:安装vim-go插件

2.3 GOPATH与Go Modules

从Go 1.11开始,推荐使用Go Modules管理依赖:

  1. # 初始化模块
  2. go mod init module_name
  3. # 下载依赖
  4. go mod tidy

3. 👶 第一个Go程序

3.1 Hello World

创建文件 main.go

  1. package main
  2. import"fmt"
  3. func main(){
  4.     fmt.Println("Hello, World! 🌍")
  5. }

3.2 运行程序

  1. # 编译并运行
  2. go run main.go
  3. # 编译为可执行文件
  4. go build main.go
  5. ./main

4. 📝 基本语法

4.1 变量声明

  1. // 方法1:声明并初始化
  2. var name string="Alice"
  3. // 方法2:类型推断
  4. var age =25
  5. // 方法3:短变量声明(函数内)
  6. city :="Beijing"
  7. // 声明多个变量
  8. var(
  9.     firstName string="John"
  10.     lastName  string="Doe"
  11. )

4.2 常量

  1. const PI =3.14159
  2. const(
  3. StatusOK=200
  4. StatusNotFound=404
  5. )

4.3 注释

  1. // 单行注释 ✍️
  2. /*
  3.  多行
  4.  注释
  5. */

5. 📊 数据类型

5.1 基础类型

  1. // 布尔类型
  2. var isActive bool=true
  3. // 整数
  4. var a int=10// 有符号整数
  5. var b int8 =127// 8位有符号整数
  6. var c int16 =32767// 16位有符号整数
  7. // 浮点数
  8. var k float32 =3.14
  9. var l float64 =3.141592653589793
  10. // 字符串
  11. var q string="Hello, Go! 👋"

5.2 派生类型

  1. // 切片(动态数组)
  2. slice :=[]int{1,2,3,4,5}
  3. // 映射(字典)
  4. := map[string]int{
  5.     "apple":5,
  6.     "banana":3,
  7. }
  8. // 结构体
  9. type Person struct{
  10.     Name string
  11.     Age int
  12. }

5.3 类型转换

  1. var i int=42
  2. var f float64 = float64(i)
  3. var u uint=uint(i)

6. 🎮 控制流程

6.1 if条件语句

  1. score :=85
  2. if score >=90{
  3.     fmt.Println("优秀 🎖️")
  4. }elseif score >=60{
  5.     fmt.Println("及格 📚")
  6. }else{
  7.     fmt.Println("不及格 😢")
  8. }

6.2 for循环

  1. // 基本形式
  2. for i :=0; i <10; i++{
  3.     fmt.Println(i)
  4. }
  5. // range遍历
  6. nums :=[]int{1,2,3,4,5}
  7. for index, value := range nums {
  8.     fmt.Printf("Index: %d, Value: %d\n", index, value)
  9. }

6.3 switch语句

  1. day :="Monday"
  2. switch day {
  3. case"Monday","Tuesday","Wednesday","Thursday","Friday":
  4.     fmt.Println("工作日 💼")
  5. case"Saturday","Sunday":
  6.     fmt.Println("周末 🎉")
  7. default:
  8.     fmt.Println("无效的日期 ❌")
  9. }

7. 🔧 函数

7.1 基本函数

  1. // 多返回值
  2. func divide(a, b int)(int, error){
  3. if b ==0{
  4.     return0, errors.New("除数不能为零 ➗")
  5. }
  6.     return a / b,nil
  7. }

7.2 可变参数

  1. func sum(nums ...int)int{
  2.     total :=0
  3. for _, n := range nums {
  4.         total += n
  5. }
  6.     return total
  7. }
  8. func main(){
  9.     fmt.Println(sum(1,2,3,4,5))// 输出: 15
  10. }

7.3 闭包示例

  1. func counter() func()int{
  2.     count :=0
  3.     return func()int{
  4.         count++
  5.     return count
  6.     }
  7. }
  8. func main(){
  9. next:= counter()
  10.     fmt.Println(next())// 1
  11.     fmt.Println(next())// 2
  12. }

8. 📦 包和模块

8.1 包的概念

Go程序由包组成,每个文件开头声明包名:

  1. package main  // 主包 🚀
  2. package utils  // 自定义工具包 🔧

8.2 导入包

  1. import(
  2. "fmt"// 标准库 📚
  3. "math"// 标准库 🧮
  4. "github.com/package"// 第三方包 📦
  5.     mypackage " ./mypackage"// 本地包(使用别名)
  6. )

8.3 Go Modules

  1. # 初始化模块
  2. go mod init github.com/username/project
  3. # 添加依赖
  4. go get github.com/pkg/errors
  5. # 整理依赖
  6. go mod tidy

9. 🏗️ 结构体和方法

9.1 定义结构体

  1. type Employeestruct{
  2.     Namestring
  3.     Salary  float64
  4.     Address struct { // 嵌套结构体
  5.     City string
  6.     Country string
  7.     }
  8. }

9.2 方法示例

  1. type Rectanglestruct{
  2.     Width  float64
  3.     Height float64
  4. }
  5. // 值接收者方法
  6. func (Rectangle)Area() float64 {
  7.     return r.Width* r.Height
  8. }

10. 🔌 接口

10.1 定义接口

  1. type Writerinterface{
  2. Write([]byte)(int, error)
  3. }
  4. type Readerinterface{
  5. Read([]byte)(int, error)
  6. }

10.2 空接口示例

  1. // 空接口可以存储任何值
  2. var any interface{}="hello"
  3. any =42
  4. any =[]int{1,2,3}

11. 🧵 并发编程

11.1 Goroutine示例

  1. func say(string){
  2. for i :=0; i <5; i++{
  3.         fmt.Println(s)
  4. }
  5. }
  6. func main(){
  7.     go say("world")// 并发执行
  8.     say("hello")
  9. }

11.2 Channel示例

  1. func sum([]int, c chan int){
  2.     sum :=0
  3. for _, v := range s {
  4.         sum += v
  5. }
  6.     c <- sum // 发送结果到channel
  7. }
  8. func main(){
  9.     s :=[]int{7,2,8,-9,4,0}
  10.     c := make(chan int)
  11.     go sum(s[:len(s)/2], c)
  12.     go sum(s[len(s)/2:], c)
  13.     x, y :=<-c,<-// 从channel接收
  14.     fmt.Println(x, y, x+y)
  15. }

12. ❌ 错误处理

12.1 错误处理哲学

Go使用返回错误值的方式处理错误:

  1. func divide(a, b float64)(float64, error){
  2. if b ==0{
  3. return0, errors.New("division by zero ⚠️")
  4. }
  5. return a / b,nil
  6. }

12.2 自定义错误

  1. type MyErrorstruct{
  2. Codeint
  3. Messagestring
  4. }
  5. func (*MyError)Error()string{
  6. return fmt.Sprintf("Error %d: %s", e.Code, e.Message)
  7. }

13. 🧰 常用标准库

13.1 fmt - 格式化I/O

  1. import"fmt"
  2. func main(){
  3. // 格式化输出
  4.     fmt.Printf("Name: %s, Age: %d\n","Alice",30)
  5. // Sprintf返回字符串
  6.     str := fmt.Sprintf("Pi: %.2f",3.14159)
  7. }

13.2 time - 时间处理

  1. import"time"
  2. func main(){
  3.     now := time.Now()
  4.     fmt.Println(now.Format("2006-01-02 15:04:05"))
  5. // 定时器
  6.     ticker := time.NewTicker(1* time.Second)
  7. <-ticker.C
  8. }

13.3 json - JSON处理

  1. import"encoding/json"
  2. type Personstruct{
  3. Namestring`json:"name"`
  4. Ageint`json:"age"`
  5. }
  6. func main(){
  7.     p :=Person{Name:"Alice",Age:30}
  8.     jsonData, _ := json.Marshal(p)
  9.     fmt.Println(string(jsonData))
  10. }

💡 练习建议

  1. 基础练习:实现一个计算器,支持加减乘除运算
  2. 并发练习:实现生产者-消费者模型
  3. HTTP服务:使用net/http实现简单的REST API
  4. 项目实战:开发一个命令行Todo应用

📚 参考资源

  • Go官方文档
  • Go语言中文文档
  • Go by Example

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  1. CONNECT:[ UseTime:0.000630s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000820s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000306s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000331s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000665s ]
  6. SELECT * FROM `set` [ RunTime:0.000198s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000594s ]
  8. SELECT * FROM `article` WHERE `id` = 485571 LIMIT 1 [ RunTime:0.000529s ]
  9. UPDATE `article` SET `lasttime` = 1777722020 WHERE `id` = 485571 [ RunTime:0.003408s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000368s ]
  11. SELECT * FROM `article` WHERE `id` < 485571 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000785s ]
  12. SELECT * FROM `article` WHERE `id` > 485571 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001317s ]
  13. SELECT * FROM `article` WHERE `id` < 485571 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001408s ]
  14. SELECT * FROM `article` WHERE `id` < 485571 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000991s ]
  15. SELECT * FROM `article` WHERE `id` < 485571 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001256s ]
0.087365s