diff --git a/zh-cn/application-dev/reference/apis/js-apis-arraylist.md b/zh-cn/application-dev/reference/apis/js-apis-arraylist.md
index 47fe1ca88cdadc08ade5db3f1bfd89dcad9bbd68..fa14e6490a7befdf21316d17c6c55fd55ba34120 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-arraylist.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-arraylist.md
@@ -456,7 +456,7 @@ arrayList.add(2);
 arrayList.add(4);
 arrayList.add(5);
 arrayList.add(4);
-arrayList.forEach((value: number, index: number) => {
+arrayList.forEach((value: number, index?: number) => {
   console.log("hyq value:" + value, "index:" + index);
 });
 ```
diff --git a/zh-cn/application-dev/reference/apis/js-apis-buffer.md b/zh-cn/application-dev/reference/apis/js-apis-buffer.md
index 21f9ec032803a1ccfa2d18123d7f9213fd2eb9f0..86b5ae373bed01dc6317b3a077c2c62ccd5abca9 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-buffer.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-buffer.md
@@ -634,9 +634,9 @@ import buffer from '@ohos.buffer';
 
 let buf = buffer.from('buffer');
 let pair = buf.entries()
-let next = pair.next()
+let next: IteratorResult<Object[]> = pair.next()
 while (!next.done) {
-  console.info(next.value)
+  console.info("buffer: " + next.value)
   next = pair.next()
 }
 ```
@@ -1963,7 +1963,7 @@ import buffer from '@ohos.buffer';
 
 let buf1 = buffer.from('buffer');
 let pair = buf1.values()
-let next = pair.next()
+let next:IteratorResult<number> = pair.next()
 while (!next.done) {
   console.log(next.value.toString());
   next = pair.next()
@@ -2923,8 +2923,8 @@ import buffer from '@ohos.buffer';
 let blob: buffer.Blob  = new buffer.Blob(['a', 'b', 'c']);
 
 class option {
-  endings: string
-  type: string
+  endings: string = ""
+  type: string = ""
 }
 let o1: option = {endings:'native', type: 'MIME'}
 let blob1: buffer.Blob = new buffer.Blob(['a', 'b', 'c'], o1);
diff --git a/zh-cn/application-dev/reference/apis/js-apis-deque.md b/zh-cn/application-dev/reference/apis/js-apis-deque.md
index 78cd11dee5ca7ced1a340937bacc6ad3c3f23818..1d7a42346db7f62a5904eeeeb905cc2dabb959f2 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-deque.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-deque.md
@@ -119,8 +119,8 @@ insertEnd(element: T): void
 
 ```ts
 class C1 {
-  name: string
-  age: string
+  name: string = ""
+  age: string = ""
 }
 
 let deque: Deque<string | number | boolean | Array<number> | C1> = new Deque();
@@ -277,7 +277,7 @@ deque.insertFront(2);
 deque.insertEnd(4);
 deque.insertFront(5);
 deque.insertEnd(4);
-deque.forEach((value: number, index: number) => {
+deque.forEach((value: number, index?: number | undefined, deque?: Deque<number> | undefined):void => {
   console.log("value:" + value, "index:" + index);
 });
 ```
@@ -386,9 +386,9 @@ for (let item of nums) {
 
 // 使用方法二：
 let iter = deque[Symbol.iterator]();
-let temp = iter.next().value;
-while(temp != undefined) {
-  console.log("value:" + temp);
-  temp = iter.next().value;
+let temp:IteratorResult<number> = iter.next();
+while(!temp.done) {
+  console.log("value:" + temp.value);
+  temp = iter.next();
 }
 ```
\ No newline at end of file
diff --git a/zh-cn/application-dev/reference/apis/js-apis-hashmap.md b/zh-cn/application-dev/reference/apis/js-apis-hashmap.md
index 3b7d17589fb1468c435cbf286913c2a3a3b94369..7fdf5741a77349cb602a179a379595cefdee8386 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-hashmap.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-hashmap.md
@@ -363,7 +363,7 @@ let hashMap: HashMap<string, number> = new HashMap();
 hashMap.set("squirrel", 123);
 hashMap.set("sparrow", 356);
 let iter = hashMap.keys();
-let temp = iter.next();
+let temp: IteratorResult<string,number> = iter.next();
 while(!temp.done) {
   console.log("value:" + temp.value);
   temp = iter.next();
@@ -400,7 +400,7 @@ let hashMap: HashMap<string, number> = new HashMap();
 hashMap.set("squirrel", 123);
 hashMap.set("sparrow", 356);
 let iter = hashMap.values();
-let temp = iter.next();
+let temp: IteratorResult<number> = iter.next();
 while(!temp.done) {
   console.log("value:" + temp.value);
   temp = iter.next();
@@ -482,7 +482,7 @@ callbackfn的参数说明：
 let hashMap: HashMap<string, number> = new HashMap();
 hashMap.set("sparrow", 123);
 hashMap.set("gull", 357);
-hashMap.forEach((value: number, key: string) => {
+hashMap.forEach((value?: number, key?: string) => {
   console.log("value:" + value, "key:" + key);
 });
 ```
@@ -517,7 +517,7 @@ let hashMap: HashMap<string, number> = new HashMap();
 hashMap.set("squirrel", 123);
 hashMap.set("sparrow", 356);
 let iter = hashMap.entries();
-let temp = iter.next();
+let temp: IteratorResult<Object[]> = iter.next();
 while(!temp.done) {
   console.log("key:" + temp.value[0]);
   console.log("value:" + temp.value[1]);
@@ -555,14 +555,14 @@ hashMap.set("squirrel", 123);
 hashMap.set("sparrow", 356);
 
 // 使用方法一：
-for (let item of hashMap) { 
-  console.log("key:" + item[0]);
-  console.log("value:" + item[1]);
+for (let key of keys) {
+  console.log("key:" + key);
+  console.log("value:" + hashMap.get(key));
 }
 
 // 使用方法二：
 let iter = hashMap[Symbol.iterator]();
-let temp = iter.next().value;
+let temp: IteratorResult<Object[]> = iter.next().value;
 while(temp != undefined) {
   console.log("key:" + temp[0]);
   console.log("value:" + temp[1]);
diff --git a/zh-cn/application-dev/reference/apis/js-apis-hashset.md b/zh-cn/application-dev/reference/apis/js-apis-hashset.md
index c005c709c1d7622e76a0daa2e5ec4023462a957f..36027747105e05f1a35130fe253e426309b53fba 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-hashset.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-hashset.md
@@ -305,7 +305,7 @@ callbackfn的参数说明：
 let hashSet: HashSet<string> = new HashSet();
 hashSet.add("sparrow");
 hashSet.add("squirrel");
-hashSet.forEach((value: string, key: string) => {
+hashSet.forEach((value?: string, key?: string): void => {
   console.log("value:" + value, "key:" + key);
 });
 ```
@@ -339,7 +339,7 @@ let hashSet: HashSet<string> = new HashSet();
 hashSet.add("squirrel");
 hashSet.add("sparrow");
 let iter = hashSet.entries();
-let temp = iter.next();
+let temp: IteratorResult<string> = iter.next();
 while(!temp.done) {
   console.log("key:" + temp.value[0]);
   console.log("value:" + temp.value[1]);
@@ -385,7 +385,7 @@ for (let item of val) {
 
 // 使用方法二：
 let iter = hashSet[Symbol.iterator]();
-let temp = iter.next();
+let temp: IteratorResult<string> = iter.next();
 while(!temp.done) {
   console.log("value: " + temp.value);
   temp = iter.next();
diff --git a/zh-cn/application-dev/reference/apis/js-apis-lightweightmap.md b/zh-cn/application-dev/reference/apis/js-apis-lightweightmap.md
index 8fba1f137b9d741627a716cf9e151fa42e276469..846ad3a55cd266e7cc112c81a8d970f2813f2dba 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-lightweightmap.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-lightweightmap.md
@@ -666,7 +666,7 @@ let lightWeightMap: LightWeightMap<string, number> = new LightWeightMap();
 lightWeightMap.set("squirrel", 123);
 lightWeightMap.set("sparrow", 356);
 let iter = lightWeightMap.keys();
-let temp = iter.next();
+let temp: IteratorResult<string, number> = iter.next();
 while(!temp.done) {
   console.log("value:" + temp.value);
   temp = iter.next();
@@ -703,7 +703,7 @@ let lightWeightMap: LightWeightMap<string, number> = new LightWeightMap();
 lightWeightMap.set("squirrel", 123);
 lightWeightMap.set("sparrow", 356);
 let iter = lightWeightMap.values();
-let temp = iter.next();
+let temp: IteratorResult<number> = iter.next();
 while(!temp.done) {
   console.log("value:" + temp.value);
   temp = iter.next();
@@ -747,7 +747,7 @@ callbackfn的参数说明：
 let lightWeightMap: LightWeightMap<string, number> = new LightWeightMap();
 lightWeightMap.set("sparrow", 123);
 lightWeightMap.set("gull", 357);
-lightWeightMap.forEach((value: number, key: string) => {
+lightWeightMap.forEach((value?: number, key?: string) => {
   console.log("value:" + value, "key:" + key);
 });
 ```
@@ -782,7 +782,7 @@ let lightWeightMap: LightWeightMap<string, number> = new LightWeightMap();
 lightWeightMap.set("squirrel", 123);
 lightWeightMap.set("sparrow", 356);
 let iter = lightWeightMap.entries();
-let temp = iter.next();
+let temp: IteratorResult<Object[]> = iter.next();
 while(!temp.done) {
   console.log("key:" + temp.value[0]);
   console.log("value:" + temp.value[1]);
@@ -863,7 +863,7 @@ for (let item2 of key) {
 
 // 使用方法二：
 let iter = lightWeightMap[Symbol.iterator]();
-let temp = iter.next();
+let temp: IteratorResult<Object[]> = iter.next();
 while(!temp.done) {
   console.log("key:" + temp.value[0]);
   console.log("value:" + temp.value[1]);
diff --git a/zh-cn/application-dev/reference/apis/js-apis-lightweightset.md b/zh-cn/application-dev/reference/apis/js-apis-lightweightset.md
index a17e0d730b7f1908159818ce6aa73cdd19fdfabf..4b9f2e180bad7670d3dac63bdfbb87ae161858ad 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-lightweightset.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-lightweightset.md
@@ -611,7 +611,7 @@ callbackfn的参数说明：
 let lightWeightSet: LightWeightSet<string> = new LightWeightSet();
 lightWeightSet.add("sparrow");
 lightWeightSet.add("gull");
-lightWeightSet.forEach((value:string, key:string) => {
+lightWeightSet.forEach((value ?: string, key ?: string) => {
   console.log("value:" + value, "key:" + key);
 });
 ```
@@ -691,7 +691,7 @@ for (let item of nums) {
 
 // 使用方法二：
 let iter = lightWeightSet[Symbol.iterator]();
-let temp = iter.next();
+let temp: IteratorResult<string> = iter.next();
 while(!temp.done) {
   console.log("value:" + temp.value);
   temp = iter.next();
diff --git a/zh-cn/application-dev/reference/apis/js-apis-linkedlist.md b/zh-cn/application-dev/reference/apis/js-apis-linkedlist.md
index 366052f94e8c9a8356bc50a6fdbf34d58d92869d..865946c1fd8d29cd7d015bea624638e576774cf9 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-linkedlist.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-linkedlist.md
@@ -641,7 +641,7 @@ linkedList.add(2);
 linkedList.add(4);
 linkedList.add(5);
 linkedList.add(4);
-linkedList.forEach((value:number, index: number) => {
+linkedList.forEach((value: number, index?: number) => {
   console.log("value:" + value, "index:" + index);
 });
 ```
@@ -851,7 +851,7 @@ for (let item of items) {
 
 // 使用方法二：
 let iter = linkedList[Symbol.iterator]();
-let temp = iter.next();
+let temp: IteratorResult<number> = iter.next();
 while(!temp.done) {
   console.log("value:" + temp.value);
   temp = iter.next();
diff --git a/zh-cn/application-dev/reference/apis/js-apis-list.md b/zh-cn/application-dev/reference/apis/js-apis-list.md
index f151ac9e52a76cf398aecc1252e471c35bc54b43..69c2d4312e7f8bd89c11aed9dd299e2c163bb202 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-list.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-list.md
@@ -503,7 +503,7 @@ list.add(2);
 list.add(4);
 list.add(5);
 list.add(4);
-list.forEach((value:number, index:number) => {
+list.forEach((value: number, index?: number) => {
   console.log("value:" + value, "index:" + index);
 });
 ```
@@ -829,7 +829,7 @@ for (let item of items) {
 
 // 使用方法二：
 let iter = list[Symbol.iterator]();
-let temp = iter.next();
+let temp: IteratorResult<number> = iter.next();
 while(!temp.done) {
   console.log("value: " + temp.value);
   temp = iter.next();
diff --git a/zh-cn/application-dev/reference/apis/js-apis-plainarray.md b/zh-cn/application-dev/reference/apis/js-apis-plainarray.md
index 654ca7fffe9973041f3e25973505e5edc5165f38..cee70aef8d6f1810ca4282481d59b4d6dbd694fc 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-plainarray.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-plainarray.md
@@ -620,7 +620,7 @@ callbackfn的参数说明：
 let plainArray: PlainArray<string> = new PlainArray();
 plainArray.add(1, "squirrel");
 plainArray.add(2, "sparrow");
-plainArray.forEach((value:string, index: number) => {
+plainArray.forEach((value: string, index?: number) => {
     console.log("value:" + value, "index:" + index);
 });
 ```
@@ -656,7 +656,7 @@ plainArray.add(1, "squirrel");
 plainArray.add(2, "sparrow");
 
 let iter = plainArray[Symbol.iterator]();
-let temp = iter.next();
+let temp: IteratorResult<Object[]> = iter.next();
 while(!temp.done) {
   console.log("key:" + temp.value[0]);
   console.log("value:" + temp.value[1]);
diff --git a/zh-cn/application-dev/reference/apis/js-apis-queue.md b/zh-cn/application-dev/reference/apis/js-apis-queue.md
index 4d5d035a775eeb6645af22f5ece39aedaed1f955..a4626d65975b9e30f7935d40a72055e29b58a1ea 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-queue.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-queue.md
@@ -206,7 +206,7 @@ queue.add(2);
 queue.add(4);
 queue.add(5);
 queue.add(4);
-queue.forEach((value : number, index : number) : void => {
+queue.forEach((value : number, index ?: number) : void => {
   console.log("value:" + value, "index:" + index);
 });
 ```
@@ -249,7 +249,7 @@ while(queue.length) {
 
 // 使用方法二：
 let iter = queue[Symbol.iterator]();
-let temp = iter.next().value;
+let temp: IteratorResult<number> = iter.next().value;
 while(temp != undefined) {
   console.log("value:" + temp);
   temp = iter.next().value;
diff --git a/zh-cn/application-dev/reference/apis/js-apis-stack.md b/zh-cn/application-dev/reference/apis/js-apis-stack.md
index f8f3db16bc3f2d205c94c0aaca34ae13247e30df..69845d5a8959e7b9b0a70622b6cd933aed51725d 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-stack.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-stack.md
@@ -244,7 +244,7 @@ stack.push(2);
 stack.push(4);
 stack.push(5);
 stack.push(4);
-stack.forEach((value : number, index : number) :void => {
+stack.forEach((value : number, index ?: number) :void => {
   console.log("value:" + value, "index:" + index);
 });
 ```
@@ -321,7 +321,7 @@ while(!stack.isEmpty()) {
 
 // 使用方法二：
 let iter = stack[Symbol.iterator]();
-let temp = iter.next().value;
+let temp: IteratorResult<number> = iter.next().value;
 while(temp != undefined) {
   console.log("value:" + temp);
   temp = iter.next().value;
diff --git a/zh-cn/application-dev/reference/apis/js-apis-treemap.md b/zh-cn/application-dev/reference/apis/js-apis-treemap.md
index b8ebb8f4696687555f293e8e8d2b02660a582d28..22b7aff92b65208d948070dcfd81984bcad6964a 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-treemap.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-treemap.md
@@ -302,7 +302,7 @@ treeMap.set("sparrow", 356);
 let map : TreeMap<string, number> = new TreeMap();
 map.set("demo", 12);
 map.setAll(treeMap); // 将treeMap中的所有元素添加到map中
-map.forEach((value : number, key : string) : void => {
+map.forEach((value ?: number, key ?: string) : void => {
   console.log("value" + value, "key" + key); // 打印结果 12 demo、356 sparrow、123 squirrel
 })
 ```
@@ -553,9 +553,9 @@ let treeMap : TreeMap<string, number> = new TreeMap();
 treeMap.set("squirrel", 123);
 treeMap.set("sparrow", 356);
 let it = treeMap.values();
-let t = it.next();
+let t: IteratorResult<number> = it.next();
 while(!t.done) {
-  console.log(t.value);
+  console.log("TreeMap" + t.value);
   t = it.next()
 }
 ```
@@ -590,9 +590,9 @@ let treeMap : TreeMap<string, number> = new TreeMap();
 treeMap.set("squirrel", 123);
 treeMap.set("sparrow", 356);
 let it = treeMap.values();
-let t = it.next();
+let t: IteratorResult<number> = it.next();
 while(!t.done) {
-  console.log(t.value);
+  console.log("TreeMap" + t.value);
   t = it.next()
 }
 ```
@@ -634,7 +634,7 @@ callbackFn的参数说明：
 let treeMap : TreeMap<string, number> = new TreeMap();
 treeMap.set("sparrow", 123);
 treeMap.set("gull", 357);
-treeMap.forEach((value : number, key : string) : void => {
+treeMap.forEach((value ?: number, key ?: string) : void => {
   console.log("value:" + value, "key:" + key);
 });
 ```
@@ -669,9 +669,9 @@ let treeMap : TreeMap<string, number> = new TreeMap();
 treeMap.set("squirrel", 123);
 treeMap.set("sparrow", 356);
 let it = treeMap.entries();
-let t = it.next();
+let t: IteratorResult<Object[]> = it.next();
 while(!t.done) {
-  console.log(t.value);
+  console.log("TreeMap" + t.value);
   t = it.next()
 }
 ```
@@ -707,14 +707,14 @@ treeMap.set("sparrow", 356);
 
 // 使用方法一：
 let it = treeMap.entries();
-let t = it.next();
+let t: IteratorResult<Object[]> = it.next();
 while(!t.done) {
-  console.log(t.value);
+  console.log("TreeMap" + t.value);
   t = it.next()
 
 // 使用方法二：
 let iter = treeMap[Symbol.iterator]();
-let temp = iter.next().value;
+let temp: IteratorResult<Object[]> = iter.next().value;
 while(temp != undefined) {
   console.log("key:" + temp[0]);
   console.log("value:" + temp[1]);
diff --git a/zh-cn/application-dev/reference/apis/js-apis-treeset.md b/zh-cn/application-dev/reference/apis/js-apis-treeset.md
index 15d2f21484e732428c828e95925b925929f5231c..7737c82bd32efe873fa68bb357baa3ea2434696b 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-treeset.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-treeset.md
@@ -462,9 +462,9 @@ let treeSet : TreeSet<string> = new TreeSet();
 treeSet.add("squirrel");
 treeSet.add("sparrow");
 let it = treeSet.values();
-let t = it.next();
+let t: IteratorResult<string> = it.next();
 while(!t.done) {
-  console.log(t.value);
+  console.log("TreeSet: " + t.value);
   t = it.next()
 }
 ```
@@ -506,7 +506,7 @@ callbackFn的参数说明：
 let treeSet : TreeSet<string> = new TreeSet();
 treeSet.add("sparrow");
 treeSet.add("gull");
-treeSet.forEach((value : string, key : string) :void => {
+treeSet.forEach((value ?: string, key ?: string) :void => {
   console.log("value:" + value, "key:" + key);
 });
 ```
@@ -541,9 +541,9 @@ let treeSet : TreeSet<string> = new TreeSet();
 treeSet.add("squirrel");
 treeSet.add("sparrow");
 let it = treeSet.entries();
-let t = it.next();
+let t: IteratorResult<Object[]> = it.next();
 while(!t.done) {
-  console.log(t.value);
+  console.log("TreeSet: " + t.value);
   t = it.next()
 }
 ```
@@ -585,7 +585,7 @@ for (let item of numbers) {
 }
 // 使用方法二：
 let iter = treeSet[Symbol.iterator]();
-let temp = iter.next().value;
+let temp: IteratorResult<string> = iter.next().value;
 while(temp != undefined) {
   console.log("value:" + temp);
   temp = iter.next().value;
diff --git a/zh-cn/application-dev/reference/apis/js-apis-vector.md b/zh-cn/application-dev/reference/apis/js-apis-vector.md
index a01b694cf650e4f7b57f7b33d549ae00f44975fd..f5ab7b7de09e2b4f11b78cd3d5bc4694d6d869e2 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-vector.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-vector.md
@@ -44,7 +44,7 @@ Vector的构造函数。
 **示例：**
 
 ```ts
-let vector : Vector<string | number | C1 | Array<number>> = new Vector();
+let vector : Vector<string | number | Array<number>> = new Vector();
 ```
 
 
@@ -359,12 +359,12 @@ callbackfn的参数说明：
 **示例：**
 
 ```ts
-let vector : Vector<string | number | Object | Array<number>> = new Vector();
+let vector : Vector<number> = new Vector();
 vector.add(2);
 vector.add(4);
 vector.add(5);
 vector.add(4);
-vector.forEach((value : Vector<string | number | Object | Array<number>> , index : number) : void => {
+vector.forEach((value : number, index ?: number) : void => {
   console.log("value:" + value, "index:" + index);
 });
 ```
@@ -864,7 +864,7 @@ for (let item of nums) {
 
 // 使用方法二：
 let iter = vector[Symbol.iterator]();
-let temp = iter.next().value;
+let temp: IteratorResult<number> = iter.next().value;
 while(temp != undefined) {
   console.log("value:" + temp);
   temp = iter.next().value;