不落虚`blogdo what you like2023-01-02T20:59:15.000Zhttp://riyuejuyjyj.github.io/不落虚Hexodocker相关知识（1）http://riyuejuyjyj.github.io/posts/7074a9e.html2023-01-02T20:59:14.000Z2023-01-02T20:59:15.000Zdocker相关知识（1）
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 4d45bbd3e057 nginx "/docker-entrypoint.…" 4 minutes ago Up 4 minutes 0.0.0.0:80->80/tcp, :::80->80/tcp stupefied_mclean
type Father struct{ FirstName string LastName string } func(father Father) Print(){ fmt.Printf("your father's name is:%v $v",father.FirstName,father.LastName) } type Son struct{ FirstName string Father //结构体继承 }
var userinfo2=make(map[string]string){ "username":"zhangsan", "age":"20", }
map也是引用类型数据
判断某个键是否存在
v,ok:=userinfo["password"] //v是值，ok是bool类型
删除某个键
delete(userinfo,"username")
map类型的切片
var userList=make(map[string][string],3,3)//可以理解为userList里有三个map类型
if userList[0]!=nil{ userList[0]["username"]="张三", userList[0]["age"]="20" } if userList[1]!=nil{ userList[0]["username"]="李四", userList[0]["age"]="19" }
for range 遍历
for _,v:=range userList{ for k,v1:=range v{ fmt.Printf("%v:%v",k,v1) } fmt.Println() }
切片类型的map
var user1=make(map[string][]string) user1["name"]=[]string{ "张三"， "李四"， } user1["hobby"]=[]string{ "sleep", "code", }
forrange 遍历
for k,v:=range user1{ fmt.Printf("%v:",k) for _,v1:=range v{ fmt.Printf("%v ",v1) } fmt.Println() } //hobby:sleep code //name:张三 李四
统计一个句子单词出现的次数
var str="how do you want to do something" str1:=strings.split(str," ") var map1=make(map[string]int) for _,v:=range str{ map1[v]++; } fmt.Print(map1) //map[do:2 how:1 something:1 to:1 want:1 you:1]
var numSlice=[]int{9, 8, 10, 15, 5, 4} for i:=0;i<len(numSlice);i++{ for j:=i+1;j<len(numSlice);j++{ if (numSlice[i]>numSlice[j]){ numSlice[i],numSlice[j]=numSlice[j],numSlice[i] } } }
冒泡排序
for i:=0;i<len(numSlice);i++{ for j:=0;j<len(numSlice)-1;j++{ if (numSlice[j]>numSlice[j+1]){ numSlice[j],numSlice[j+1]=numSlice[j+1],numSlice[j] } } }
var strSlice = []string{"php", "python", "java", "golang"} for i := 0; i < len(strSlice); i++ { fmt.Printf("%v ", strSlice[i]) } fmt.Println() for _, v := range strSlice { fmt.Printf("%v ", v) } fmt.Println()
package main import"fmt" funcmain() { var name string = "周桐" var age int = 20 print(name) fmt.Println(name, age) }
变量的初始化
package main import"fmt" funcmain() { var ( name string age int addr string ) name = "zhoutong" age = 20 addr = "huaikou" //string默认值为空，int为0 //在go语言中如果有未使用的变量，会报错 //var 定义变量，如果没有赋值，就会有其默认值 fmt.Println(name, age, addr) }
理解变量
package main
import"fmt"
funcmain() { var num int = 20 fmt.Printf("num:%d,内存地址为:%p", num, &num) num=30 fmt.Printf("num:%d,内存地址为:%p", num, &num) }
变量的交换
这里就有点像python，可以不用中间量
package main import"fmt" funcmain() { var a int = 100 var b int = 200 fmt.Println(a, b) b, a = a, b fmt.Println(a, b) }
匿名变量
通过匿名变量接受不需要的参数，比较重要的知识点
package main import"fmt" functest() (int, int) { return100, 200 } funcmain() { var a, b int = test() fmt.Println(a, b) var c, _ int = test() fmt.Println(c) }
常量通过const定义
package main import"fmt" funcmain() { const name string = "aaa" const ( n1=100 n2 n3 ) fmt.Println(n1,n2,n3) fmt.Println(name) }
iota的用法
package main import"fmt" funcmain() { const url string = "www.baidu.com" const url1 = "www.4399.com" const ( a = iota b = iota c = iota ) const ( d = iota//iota=0 e //iota=1 f //iota=2 g = "haha"//iota=3 h //iota=4 i //iota=5 j = iota//iota=6 k //iota=7 ) fmt.Println(a, b, c) fmt.Println(d, e, f, g, h, i, j, k) }
for i := 0; i < len(arr3); i++ { fmt.Printf("%d ", arr3[i]) } fmt.Println() for _, v := range arr3 { fmt.Printf("%d ", v) } fmt.Println() var max = 0 for _, v := range arr3 { if v >= max { max = v } } fmt.Printf("arr3的最大值为:%d", max) }
二维数组
package main
import"fmt"
funcmain() { //值类型 引用类型 //基本数组类型和数组都是值类型
var a = 10 b := a a = 20 fmt.Println(a, b)
var arr1 = [...]int{12, 5, 6, 7} var arr2 = arr1 arr1[0] = 11 fmt.Println(arr2) fmt.Println(arr1)
//切片 var arr3 = []int{1, 2, 3} var arr4 = arr3 //将地址赋给arr4g arr3[0] = 5 fmt.Println(arr3) fmt.Println(arr4)
arr := [2][2]string{ {"beijing", "shanghai"}, {"chengdu", "shengzheng"}, } fmt.Println(arr) for _, v1 := range arr { for _, v := range v1 { fmt.Printf("%v", v) } fmt.Println() } }
