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Go 学习笔记 - 基础篇1

  • 2026-02-06 11:49:05
Go 学习笔记 - 基础篇1

大家好我是小西,从今天开始,我将开始更新Go基础篇的笔记

预计有5篇,基础篇写完了,再写应用篇,大致是这个计划

老手可以回顾回顾 ,温故知新~ 新手可以收藏一下 做个参考

本文写作时,最新的Go 版本是 1.25.6 

GO 版本号使用的是 semver ,语义化版本号

主版本号.次版本号.修订号 MAJOR.MINOR.PATCH

中间的 Minor 会在每年的 2月和8月发布

后面的 Patch 会在修复bug 后更新

本教程收集整理自 go 官方的 A tour of Go

Go的主要特点

  • 自带runtime 垃圾回收器
  • 丰富的内置类型
  • 更少的关键字 25
  • 显示的依赖显示的类型转换
  • 函数多返回值
  • Gofmt 统一代码格式
  • 内置并发      goroutine + channel 
  • 编译快,交叉编译简单,轻松部署
  • 强大的标准库 + 工具链
  • 首字母决定可见性
包与模块

package 用于定义一个包 package main

import 用于导入一个包 import "fmt"

首字母大写表示是公开的属性或方法

math.Pi 表示π的值

函数

使用 func 定义函数func add(x, y int) int { }

同类型可以只写一次 x int, y int-> x, y int

可以有多返回值,比如交换a,b 的值

具名返回值,用得少

变量

var 声明,类型在后面var a, b, c bool

声明并初始化 var i, j int = 1, 2

c := 4 短声明函数内使用,有类型推导

函数外的语句要以关键词开始

varfuncimport 

基本类型

bool

string

intint8int16int32int64uint uint8 uint16 uint32 uint64 uintptr

byte // alias for uint8

rune // alias for int32// represents a Unicode code point

float32 float64

complex64 complex128

每个类型都有零值,初始化时的值

是全部数值类型的零值

false 是布尔类型的零值

"" 空字符串是string 类型的零值

类型转换 T(v)var i float64 = float64(i)

没有隐式转换

常量

Const Pi = 3.141592653589793

常量只能是字符,字符串,bool, 数值

for 循环,if 判断与switch

for 循环小括号不必需大括号必需for i:=0;i < 100; i++ {}

for 等同于 C  while for i < 100 {}

for直接加 {}, 无限循环 for { }

if 不要小括号,大括号必需有 if x <0 { }

If + 短声明if v: = math.Pow(x, n); v < lim {}

switch 不需要 break 语句了,匹配到 case 就停止执行

Switch 后可以不加语句,表示匹配 true 

defer 延迟执行

Defer 的函数会形成一个栈,后 defer 的函数先执行

今天先写到这,欢迎关注我,下期见~

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  140. /yingpanguazai/ssd/ssd1/www/no.67808.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000563s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000599s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.004579s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002206s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000596s ]
  6. SELECT * FROM `set` [ RunTime:0.004008s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000641s ]
  8. SELECT * FROM `article` WHERE `id` = 463188 LIMIT 1 [ RunTime:0.000623s ]
  9. UPDATE `article` SET `lasttime` = 1770607560 WHERE `id` = 463188 [ RunTime:0.004180s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000282s ]
  11. SELECT * FROM `article` WHERE `id` < 463188 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000404s ]
  12. SELECT * FROM `article` WHERE `id` > 463188 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000406s ]
  13. SELECT * FROM `article` WHERE `id` < 463188 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001491s ]
  14. SELECT * FROM `article` WHERE `id` < 463188 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001414s ]
  15. SELECT * FROM `article` WHERE `id` < 463188 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000884s ]
0.096535s