Update 设计模式.md

CompetitiveLin · CompetitiveLin · commit f4a1937f8637 · 2024-09-23T13:08:22.000+08:00
diff --git a/设计模式.md b/设计模式.md
@@ -1,6 +1,8 @@
 # 设计模式
 
-1. 责任链模式
+
+
+## 责任链模式
 
 ```go
 package main
@@ -49,3 +51,32 @@ func main() {
 
 ```
 
+
+
+
+
+## 单例模式
+
+```go
+package main
+
+import "sync"
+
+type people struct {
+}
+
+var instance *people
+var once sync.Once
+
+func getInstance() *people {
+	once.Do(func() {
+		instance = &people{}
+	})
+	return instance
+}
+
+func main() {
+
+}
+```
+
