diff --git a/behavior/04_iterator/README.md b/behavior/04_iterator/README.md
index 788872b..43a4b0d 100644
--- a/behavior/04_iterator/README.md
+++ b/behavior/04_iterator/README.md
@@ -4,8 +4,21 @@
 
 迭代器模式在各种语言中都有很深入，很广泛的应用，迭代器模式就是，对这种存在于语言中的基本模式的进一步应用。
 
+迭代器模式中的两个重要的接口：
 
-迭代器是一种管理数据的方式。
+```go
+type Iterator interface {
+//定义迭代器可以进行的动作
+  Next()
+//...
+}
 
+type IEnumerator interface {
+  //返回一个迭代器接口
+	Iterator() Iterator
+}
+```
+
+迭代器是一种管理数据的方式,往往需要一个管理数据的内在容器/集合/链表/栈等结构，需要注意的是，一般在访问上不实现为链表的访问方式，而使用滑动游标的方式。
 现实生活中的景区的地图指南就是一个很好的迭代器的例子，地图就是一个迭代器，不论是哪个景区，都能通过一张地图(或者说这个迭代器)，让你明白当前景区的景点数，最佳参观顺序等，游客只需要按照迭代器的方式去访问景点即可。
 
diff --git a/behavior/04_iterator/iterator.go b/behavior/04_iterator/iterator.go
index 8c83493..7552e2e 100644
--- a/behavior/04_iterator/iterator.go
+++ b/behavior/04_iterator/iterator.go
@@ -3,55 +3,76 @@ package iterator
 ////////////////////////////////
 //使用景点例子
 
-//ITouristMap 游客地图是一个迭代器Iterator，为用户提供当前景区中不同景点的统一访问能力
-type ITouristMap interface {
-	FirstPot()         //首个景点
-	IsLastPot() bool   //当前景点是否是最后一个
-	Next() interface{} //下一个景点
+//Iterator 游客地图是一个迭代器Iterator，为用户提供当前景区中不同景点的统一访问能力
+type Iterator interface {
+	Reset()          //重置
+	FirstPot() IPot  //首个景点
+	IsLastPot() bool //当前景点是否是最后一个
+	Next() IPot      //下一个景点
 }
 
-//IScenicArea 是一个针对景区的Aggregate聚合类型接口，返回一个迭代器接口
-//IScenicArea 返回一个游客访问接口
-type IScenicArea interface {
-	Iterator() ITouristMap
+//IPot 景点对象的接口
+type IPot interface {
+	Visit() //景点可以参观
 }
 
 //ScenicArea 景区包含所有的景点
 type ScenicArea struct {
-	count int           //景点的数量
-	pots  []interface{} //景点列表，景区可能一直在开发新的景点，所以景区的数量可能一直在增长
+	count int    //景点的数量
+	pots  []IPot //景点列表，景区可能一直在开发新的景点，所以景区的数量可能一直在增长
 }
 
-//Iterator 通过
-func (s *ScenicArea) Iterator() ITouristMap {
-	return &ScenicAreaPotsMap{
-		numbers: n,
-		next:    n.start,
+//PotsIterator 实现景区景点迭代器的对象
+//PotsIterator 该对象的目的就是为了隐藏景区本身
+//PotsIterator 实现为一个游标迭代器
+type PotsIterator struct {
+	cursor    int
+	potsSlice []IPot
+}
+
+//Iterator 返回一个接待
+func (s *ScenicArea) Iterator() Iterator {
+	return &PotsIterator{
+		cursor:    0,
+		potsSlice: s.pots,
 	}
 }
 
-//ScenicAreaPotsMap 就是景区提供的迭代器类型，要实现具体的景区景点的迭代访问能力
-type ScenicAreaPotsMap struct {
-	numbers *Numbers
-	next    int
+//AddPot 添加景点
+func (s *ScenicArea) AddPot(pots ...IPot) {
+	for i := range pots {
+		s.count++
+		s.pots = append(s.pots, pots[i])
+	}
+}
+
+//PotsCount 添加景点
+func (s *ScenicArea) PotsCount() int {
+	return s.count
+}
+
+//Reset 重置
+func (s *PotsIterator) Reset() {
+	s.cursor = 0
 }
 
 //FirstPot 第一个景点
-func (i *ScenicAreaPotsMap) FirstPot() {
-	i.next = i.numbers.start
+func (s *PotsIterator) FirstPot() IPot {
+	return s.potsSlice[0]
 }
 
-//IsLastPot 是否是最后一个
-func (i *ScenicAreaPotsMap) IsLastPot() bool {
-	return i.next > i.numbers.end
+//IsLastPot 判断游标的位置
+func (s *PotsIterator) IsLastPot() bool {
+	return s.cursor == -1
 }
 
 //Next 去路线上的下一个景点
-func (i *ScenicAreaPotsMap) Next() interface{} {
-	if !i.IsDone() {
-		next := i.next
-		i.next++
-		return next
+func (s *PotsIterator) Next() IPot {
+	if s.cursor+1 == len(s.potsSlice) {
+		s.cursor = -1 //设置到最后
+		return nil
 	}
-	return nil
+	s.cursor++
+	return s.potsSlice[s.cursor]
+
 }
diff --git a/behavior/04_iterator/iterator_test.go b/behavior/04_iterator/iterator_test.go
index a508289..ac2f580 100644
--- a/behavior/04_iterator/iterator_test.go
+++ b/behavior/04_iterator/iterator_test.go
@@ -1,19 +1,52 @@
 package iterator
 
-func ExampleIterator() {
-	var aggregate Aggregate
-	aggregate = NewNumbers(1, 10)
+import (
+	"fmt"
+	"testing"
+)
 
-	IteratorPrint(aggregate.Iterator())
-	// Output:
-	// 1
-	// 2
-	// 3
-	// 4
-	// 5
-	// 6
-	// 7
-	// 8
-	// 9
-	// 10
+//ChildPot 儿童景点
+type ChildPot struct {
+	Name string
+}
+
+func (c *ChildPot) Visit() {
+	fmt.Println("i am: ", c.Name)
+}
+func TestIterator(t *testing.T) {
+
+	scenicArea := ScenicArea{}
+
+	scenicArea.AddPot(&ChildPot{Name: "monkey garden"}, &ChildPot{Name: "fairy country"}, &ChildPot{Name: "future space"})
+
+	t.Log("pots count:", scenicArea.PotsCount())
+
+	potInterator := scenicArea.Iterator()
+
+	pot := potInterator.FirstPot()
+
+	t.Logf("first pot: %#v\n", pot)
+
+	VisitAllPots(potInterator)
+
+	t.Log("add a pot", "pot: count", scenicArea.PotsCount())
+
+	scenicArea.AddPot(&ChildPot{Name: "virtual world"})
+
+	t.Log("pots count:", scenicArea.PotsCount())
+
+	//切片变了，要重新获取
+	potInterator = scenicArea.Iterator()
+
+	potInterator.Reset()
+
+	VisitAllPots(potInterator)
+
+}
+
+func VisitAllPots(i Iterator) {
+	for c := i.FirstPot(); !i.IsLastPot(); c = i.Next() {
+		c.Visit()
+		fmt.Printf("finish visit pot : %#v\n", c)
+	}
 }
diff --git a/go.mod b/go.mod
index 6fbc91b..ac9fa4e 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,7 @@ module github.com/crazybber/go-fucking-algorithm
 
 go 1.14
 
-require github.com/logrusorgru/aurora v0.0.0-20200102142835-e9ef32dff381
+require (
+	github.com/logrusorgru/aurora v0.0.0-20200102142835-e9ef32dff381
+	go.uber.org/zap v1.15.0
+)
diff --git a/go.sum b/go.sum
index 6823f4b..4f49e76 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,44 @@
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
+github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
+github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
+github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/logrusorgru/aurora v0.0.0-20200102142835-e9ef32dff381 h1:bqDmpDG49ZRnB5PcgP0RXtQvnMSgIF14M7CBd2shtXs=
 github.com/logrusorgru/aurora v0.0.0-20200102142835-e9ef32dff381/go.mod h1:7rIyQOR62GCctdiQpZ/zOJlFyk6y+94wXzv6RNZgaR4=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
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+github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
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