fix

blog/golang/golang-concurrency.md

+# 第二十章 golang 并发编程
+
+## golang 并发编程之协程
+
+共语言中的并发是`函数`相互独立运行的能力。goroutines 是并发运行的函数
+
+创建协程
+
+```go
+go task()
+```
+
+示例 1
+
+```go
+package main
+
+import (
+    "fmt"
+    "time"
+)
+
+func showMessage(message string) {
+    for i := 0; i < 5; i++ {
+        fmt.Println(message)
+        time.Sleep(time.Millisecond * 100)
+    }
+}
+
+func main() {
+    showMessage("Tom")
+    showMessage("Jack")
+}
+
+```
+
+输出
+
+```
+Tom
+Tom
+Tom
+Tom
+Tom
+Jack
+Jack
+Jack
+Jack
+Jack
+```
+
+```go
+func main() {
+    go showMessage("Tom")
+    showMessage("Jack")
+}
+```
+
+输出
+
+```go
+Jack
+Tom
+Tom
+Jack
+Jack
+Tom
+Tom
+Jack
+Jack
+Tom
+```
+
+示例 2
+
+```go
+package main
+
+import (
+    "fmt"
+    "io/ioutil"
+    "log"
+    "net/http"
+    "time"
+)
+
+func responseSize(url string) {
+    fmt.Println("step1: ", url)
+    response, err := http.Get(url)
+    if err != nil {
+        log.Fatal(err)
+    }
+
+    fmt.Println("step2: ", url)
+    defer response.Body.Close()
+
+    fmt.Println("step3: ", url)
+    body, err := ioutil.ReadAll(response.Body)
+    if err != nil {
+        log.Fatal(err)
+    }
+    fmt.Println("step4: ", len(body))
+}
+
+func main() {
+    go responseSize("https://www.baidu.com/")
+    go responseSize("https://www.jd.com/")
+    go responseSize("https://www.taobao.com/")
+    time.Sleep(time.Second * 10)
+}
+
+```
+
+输出
+
+```
+step1:  https://www.baidu.com/
+step1:  https://www.jd.com/
+step1:  https://www.taobao.com/
+step2:  https://www.jd.com/
+step3:  https://www.jd.com/
+step4:  160260
+step2:  https://www.baidu.com/
+step3:  https://www.baidu.com/
+step4:  227
+step2:  https://www.taobao.com/
+step3:  https://www.taobao.com/
+step4:  87347
+```

blog/golang/index.md

@@ -16,15 +16,15 @@
 
 [第四章 Golang 项目管理](/blog/golang/golang-project.md)
 
-[第五章 Golang标识符、关键字、命名规则](blog/golang/golang-identifier.md)
+[第五章 Golang标识符、关键字、命名规则](/blog/golang/golang-identifier.md)
 
-[第六章 Golang变量](blog/golang/golang-variable.md)
+[第六章 Golang变量](/blog/golang/golang-variable.md)
 
-[第七章 Golang 常量](blog/golang/golang-constant.md)
+[第七章 Golang 常量](/blog/golang/golang-constant.md)
 
-[第八章 Golang 数据类型](blog/golang/golang-type.md)
+[第八章 Golang 数据类型](/blog/golang/golang-type.md)
 
-[第九章 Golang 格式化输出](blog/golang/golang-format.md)
+[第九章 Golang 格式化输出](/blog/golang/golang-format.md)
 
 [第十章 Golang 运算符](/blog/golang/golang-operator.md)
 
@@ -46,7 +46,10 @@
 
 [第十九章 Golang包 package](/blog/golang/golang-package.md)
 
+[第二十章 golang 并发编程](/blog/golang/golang-concurrency.md)
+
 
 https://www.bilibili.com/video/BV1ME411Y71o?p=27&spm_id_from=pageDriver&vd_source=efbb4dc944fa761b6e016ce2ca5933da
 
-https://www.bilibili.com/video/BV1zR4y1t7Wj?p=67&spm_id_from=pageDriver&vd_source=efbb4dc944fa761b6e016ce2ca5933da
+
\ No newline at end of file
+https://www.bilibili.com/video/BV1zR4y1t7Wj/?p=68&spm_id_from=pageDriver&vd_source=efbb4dc944fa761b6e016ce2ca5933da
\ No newline at end of file