Update docs against 19678

Signed-off-by: wusongqing<wusongqing@huawei.com>

en/application-dev/reference/apis/js-apis-arraylist.md

@@ -379,15 +379,15 @@ Replaces all elements in this container with new elements, and returns the new o
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | callbackFn | function | Yes| Callback invoked for the replacement.|
-| thisArg | Object | No| Value to use when the callback is invoked.|
+| thisArg | Object | No| Value of **this** to use when **callbackFn** is invoked. The default value is this instance.|
 
-callbackfn
+callbackFn
 
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | value | T | Yes| Value of the element that is currently traversed.|
-| index | number | No| Position index of the element that is currently traversed.|
-| arrlist | ArrayList<T> | No| Instance that invokes the **replaceAllElements** method.|
+| index | number | No| Position index of the element that is currently traversed. The default value is **0**.|
+| arrlist | ArrayList<T> | No| Instance that calls the **replaceAllElements** API. The default value is this instance.|
 
 **Error codes**
 
@@ -425,15 +425,15 @@ Uses a callback to traverse the elements in this container and obtain their posi
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | callbackFn | function | Yes| Callback invoked for the replacement.|
-| thisArg | Object | No| Value to use when the callback is invoked.|
+| thisArg | Object | No| Value of **this** to use when **callbackFn** is invoked. The default value is this instance.|
 
-callbackfn
+callbackFn
 
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | value | T | Yes| Value of the element that is currently traversed.|
-| index | number | No| Position index of the element that is currently traversed.|
-| arrlist | ArrayList<T> | No| Instance that invokes the **forEach** method.|
+| index | number | No| Position index of the element that is currently traversed. The default value is 0.|
+| arrlist | ArrayList<T> | No| Instance that calls the **forEach** API. The default value is this instance.|
 
 **Error codes**
 
@@ -468,7 +468,7 @@ Sorts elements in this container.
 
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
-| comparator | function | No| Callback invoked for sorting.|
+| comparator | function | No| Callback invoked for sorting. The default value is the callback function for sorting elements in ascending order.|
 
 comparator
 

en/application-dev/reference/apis/js-apis-buffer.md

@@ -204,7 +204,7 @@ Concatenates an array of **Buffer** instances of the specified length into a new
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | list | Buffer[] \| Uint8Array[] | Yes| Array of instances to concatenate.|
-| totalLength | number | No| Total length of bytes to be copied.|
+| totalLength | number | No| Total length of bytes to be copied. The default value is **0**.|
 
 **Return value**
 
@@ -1915,7 +1915,7 @@ Converts the data at the specified position in this **Buffer** instance into a s
 
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
-| encoding | string | No| Encoding format of the string. The default value is **utf-8**.|
+| encoding | string | No| Encoding format (valid only when **value** is a string). The default value is **utf-8**.|
 | start  | number | No|  Offset to the start position of the data to convert. The default value is **0**.|
 | end  | number | No|  Offset to the end position of the data to convert. The default value is the length of this **Buffer** instance.|
 

en/application-dev/reference/apis/js-apis-deque.md

@@ -242,15 +242,15 @@ Uses a callback to traverse the elements in this container and obtain their posi
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | callbackFn | function | Yes| Callback invoked to traverse the elements in the container.|
-| thisArg | Object | No| Value to use when the callback is invoked.|
+| thisArg | Object | No| Value of **this** to use when **callbackFn** is invoked. The default value is this instance.|
 
-callbackfn
+callbackFn
 
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | value | T | Yes| Value of the element that is currently traversed.|
-| index | number | No| Position index of the element that is currently traversed.|
-| deque | Deque<T> | No| Instance that invokes the **forEach** method.|
+| index | number | No| Position index of the element that is currently traversed. The default value is **0**.|
+| deque | Deque<T> | No| Instance that calls the **forEach** API. The default value is this instance.|
 
 **Error codes**
 

en/application-dev/reference/apis/js-apis-hashmap.md

@@ -459,14 +459,14 @@ Uses a callback to traverse the elements in this container and obtain their posi
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | callbackFn | function | Yes| Callback invoked to traverse the elements in the container.|
-| thisArg | Object | No| Value to use when the callback is invoked.|
+| thisArg | Object | No| Value of **this** to use when **callbackFn** is invoked. The default value is this instance.|
 
-callbackfn
+callbackFn
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
-| value | V | No| Value of the element that is currently traversed.|
-| key | K | No| Key of the element that is currently traversed.|
-| map | HashMap<K, V> | No| Instance that invokes the **forEach** method.|
+| value | V | No| Value of the element that is currently traversed. The default value is the value of the first key-value pair.|
+| key | K | No| Key of the element that is currently traversed. The default value is the key of the first key-value pair.|
+| map | HashMap<K, V> | No| Instance that calls the **forEach** API. The default value is this instance.|
 
 **Error codes**
 

en/application-dev/reference/apis/js-apis-hashset.md

@@ -282,14 +282,14 @@ Uses a callback to traverse the elements in this container and obtain their posi
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | callbackFn | function | Yes| Callback invoked to traverse the elements in the container.|
-| thisArg | Object | No| Value to use when the callback is invoked.|
+| thisArg | Object | No| Value of **this** to use when **callbackFn** is invoked. The default value is this instance.|
 
-callbackfn
+callbackFn
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
-| value | T | No| Value of the element that is currently traversed.|
-| key | T | No| Key of the element that is currently traversed (same as **value**).|
-| set | HashSet<T> | No| Instance that invokes the **forEach** API.|
+| value | T | No| Value of the element that is currently traversed. The default value is the value of the first key-value pair.|
+| key | T | No| Key of the element that is currently traversed (same as **value**). The default value is the key of the first key-value pair.|
+| set | HashSet<T> | No| Instance that calls the **forEach** API. The default value is this instance.|
 
 **Error codes**
 

en/application-dev/reference/apis/js-apis-lightweightmap.md

@@ -724,14 +724,14 @@ Uses a callback to traverse the elements in this container and obtain their posi
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | callbackFn | function | Yes| Callback invoked to traverse the elements in the container.|
-| thisArg | Object | No| Value to use when the callback is invoked.|
+| thisArg | Object | No| Value of **this** to use when **callbackFn** is invoked. The default value is this instance.|
 
-callbackfn
+callbackFn
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
-| value | V | No| Value of the element that is currently traversed.|
-| key | K | No| Key of the element that is currently traversed.|
-| map | LightWeightMap<K, V> | No| Instance that invokes the **forEach** method.|
+| value | V | No| Value of the element that is currently traversed. The default value is the value of the first key-value pair.|
+| key | K | No| Key of the element that is currently traversed. The default value is the key of the first key-value pair.|
+| map | LightWeightMap<K, V> | No| Instance that calls the **forEach** API. The default value is this instance.|
 
 **Error codes**
 

en/application-dev/reference/apis/js-apis-lightweightset.md

@@ -588,14 +588,14 @@ Uses a callback to traverse the elements in this container and obtain their posi
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | callbackFn | function | Yes| Callback invoked to traverse the elements in the container.|
-| thisArg | Object | No| Value to use when the callback is invoked.|
+| thisArg | Object | No| Value of **this** to use when **callbackFn** is invoked. The default value is this instance.|
 
-callbackfn
+callbackFn
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
-| value | T | No| Value of the element that is currently traversed.|
-| key| T | No| Key of the element that is currently traversed (same as **value**).|
-| set | LightWeightSet<T> | No| Instance that invokes the **forEach** method.|
+| value | T | No| Value of the element that is currently traversed. The default value is the value of the first key-value pair.|
+| key| T | No| Key of the element that is currently traversed (same as **value**). The default value is the key of the first key-value pair.|
+| set | LightWeightSet<T> | No| Instance that calls the **forEach** API. The default value is this instance.|
 
 **Error codes**
 

en/application-dev/reference/apis/js-apis-linkedlist.md

@@ -607,15 +607,15 @@ Uses a callback to traverse the elements in this container and obtain their posi
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | callbackFn | function | Yes| Callback invoked to traverse the elements in the container.|
-| thisArg | Object | No| Value to use when the callback is invoked.|
+| thisArg | Object | No| Value of **this** to use when **callbackFn** is invoked. The default value is this instance.|
 
-callbackfn
+callbackFn
 
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | value | T | Yes| Value of the element that is currently traversed.|
-| index | number | No| Position index of the element that is currently traversed.|
-| LinkedList | LinkedList<T> | No| Instance that invokes the **forEach** API.|
+| index | number | No| Position index of the element that is currently traversed. The default value is **0**.|
+| LinkedList | LinkedList<T> | No| Instance that calls the **forEach** API. The default value is this instance.|
 
 **Error codes**
 

en/application-dev/reference/apis/js-apis-list.md

@@ -427,15 +427,15 @@ Replaces all elements in this container with new elements, and returns the new o
 | Name| Value Type | Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | callbackFn | function | Yes| Callback invoked for the replacement.|
-| thisArg | Object | No| Value to use when the callback is invoked.|
+| thisArg | Object | No| Value of **this** to use when **callbackFn** is invoked. The default value is this instance.|
 
-callbackfn
+callbackFn
 
 | Name| Value Type | Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | value | T | Yes| Value of the element that is currently traversed.|
-| index | number | No| Position index of the element that is currently traversed.|
-| list | List<T> | No| Instance that invokes the **replaceAllElements** method.|
+| index | number | No| Position index of the element that is currently traversed. The default value is **0**.|
+| list | List<T> | No| Instance that calls the **replaceAllElements** API. The default value is this instance.|
 
 **Error codes**
 
@@ -473,15 +473,15 @@ Uses a callback to traverse the elements in this container and obtain their posi
 | Name| Value Type | Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | callbackFn | function | Yes| Callback invoked for the replacement.|
-| thisArg | Object | No| Value to use when the callback is invoked.|
+| thisArg | Object | No| Value of **this** to use when **callbackFn** is invoked. The default value is this instance.|
 
-callbackfn
+callbackFn
 
 | Name| Value Type | Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | value | T | Yes| Value of the element that is currently traversed.|
-| index | number | No| Position index of the element that is currently traversed.|
-| List | List<T> | No| Instance that invokes the **forEach** method.|
+| index | number | No| Position index of the element that is currently traversed. The default value is **0**.|
+| List | List<T> | No| Instance that calls the **forEach** API. The default value is this instance.|
 
 **Error codes**
 

en/application-dev/reference/apis/js-apis-plainarray.md

@@ -597,14 +597,14 @@ Uses a callback to traverse the elements in this container and obtain their posi
 | Name| Type | Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | callbackFn | function | Yes| Callback invoked to traverse the elements in the container.|
-| thisArg | Object | No| Value to use when the callback is invoked.|
+| thisArg | Object | No| Value of **this** to use when **callbackFn** is invoked. The default value is this instance.|
 
-callbackfn
+callbackFn
 | Name| Type | Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | value | T | Yes| Value of the element that is currently traversed.|
-| index | number | No| Key of the element that is currently traversed.|
-| PlainArray | PlainArray<T>| No| Instance that invokes the **forEach** API.|
+| index | number | No| Position index of the element that is currently traversed. The default value is **0**.|
+| PlainArray | PlainArray<T>| No| Instance that calls the **forEach** API. The default value is this instance.|
 
 **Error codes**
 

en/application-dev/reference/apis/js-apis-queue.md

@@ -176,15 +176,15 @@ Uses a callback to traverse the elements in this container and obtain their posi
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | callbackFn | function | Yes| Callback invoked to traverse the elements in the container.|
-| thisArg | Object | No| Value to use when the callback is invoked.|
+| thisArg | Object | No| Value of **this** to use when **callbackFn** is invoked. The default value is this instance.|
 
-callbackfn
+callbackFn
 
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | value | T | Yes| Value of the element that is currently traversed.|
-| index | number | No| Position index of the element that is currently traversed.|
-| Queue | Queue<T> | No| Instance that invokes the **forEach** method.|
+| index | number | No| Position index of the element that is currently traversed. The default value is **0**.|
+| Queue | Queue<T> | No| Instance that calls the **forEach** API. The default value is this instance.|
 
 **Error codes**
 

en/application-dev/reference/apis/js-apis-stack.md

@@ -214,15 +214,15 @@ Uses a callback to traverse the elements in this container and obtain their posi
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | callbackFn | function | Yes| Callback invoked to traverse the elements in the container.|
-| thisArg | Object | No| Value to use when the callback is invoked.|
+| thisArg | Object | No| Value of **this** to use when **callbackFn** is invoked. The default value is this instance.|
 
-callbackfn
+callbackFn
 
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | value | T | Yes| Value of the element that is currently traversed.|
-| index | number | No| Position index of the element that is currently traversed.|
-| stack | Stack<T> | No| Instance that invokes the **forEach** method.|
+| index | number | No| Position index of the element that is currently traversed. The default value is **0**.|
+| stack | Stack<T> | No| Instance that calls the **forEach** API. The default value is this instance.|
 
 **Error codes**
 

en/application-dev/reference/apis/js-apis-treemap.md

@@ -48,7 +48,7 @@ A constructor used to create a **TreeMap** instance.
 
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
-| comparator | function | No| Custom comparator.|
+| comparator | function | No| Custom comparator. The default value is **hole** (a blank placeholder), indicating that no comparator. is provided.|
 
 **Error codes**
 
@@ -611,14 +611,14 @@ Uses a callback to traverse the elements in this container and obtain their posi
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | callbackFn | function | Yes| Callback invoked to traverse the elements in the container.|
-| thisArg | Object | No| Value of **this** to use when **callbackFn** is invoked.|
+| thisArg | Object | No| Value of **this** to use when **callbackFn** is invoked. The default value is this instance.|
 
-callbackfn
+callbackFn
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
-| value | V | No| Value of the element that is currently traversed.|
-| key | K | No| Key of the element that is currently traversed.|
-| map | TreeMap<K, V> | No| Instance that invokes the **forEach** method.|
+| value | V | No| Value of the element that is currently traversed. The default value is the value of the first key-value pair.|
+| key | K | No| Key of the element that is currently traversed. The default value is the key of the first key-value pair.|
+| map | TreeMap<K, V> | No| Instance that calls the **forEach** API. The default value is this instance.|
 
 **Error codes**
 

en/application-dev/reference/apis/js-apis-treeset.md

@@ -44,7 +44,7 @@ A constructor used to create a **TreeSet** instance.
 
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
-| comparator | function | No| Custom comparator.|
+| comparator | function | No| Custom comparator. The default value is **hole** (a blank placeholder), indicating that no comparator. is provided.|
 
 **Error codes**
 
@@ -484,14 +484,14 @@ Uses a callback to traverse the elements in this container and obtain their posi
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | callbackFn | function | Yes| Callback invoked to traverse the elements in the container.|
-| thisArg | Object | No| Value of **this** to use when **callbackFn** is invoked.|
+| thisArg | Object | No| Value of **this** to use when **callbackFn** is invoked. The default value is this instance.|
 
-callbackfn
+callbackFn
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
-| value | T | No| Value of the element that is currently traversed.|
-| key | T | No| Key of the element that is currently traversed.|
-| set | TreeSet<T> | No| Instance that invokes the **forEach** method.|
+| value | T | No| Value of the element that is currently traversed. The default value is the value of the first key-value pair.|
+| key | T | No| Key of the element that is currently traversed. The default value is the key of the first key-value pair.|
+| set | TreeSet<T> | No| Instance that calls the **forEach** API. The default value is this instance.|
 
 **Error codes**
 

en/application-dev/reference/apis/js-apis-util.md

@@ -586,7 +586,7 @@ result = textEncoder.encodeInto("\uD800¥¥");
 
 ### encodeIntoUint8Array<sup>9+</sup>
 
-encodeIntoUint8Array(input: string, dest: Uint8Array, ): { read: number; written: number }
+encodeIntoUint8Array(input: string, dest: Uint8Array): { read: number; written: number }
 
 Stores the UTF-8 encoded text.
 
@@ -617,7 +617,7 @@ result = that.encodeIntoUint8Array('abcd', dest)
 
 ### encodeInto<sup>(deprecated)</sup>
 
-encodeInto(input: string, dest: Uint8Array, ): { read: number; written: number }
+encodeInto(input: string, dest: Uint8Array): { read: number; written: number }
 
 Stores the UTF-8 encoded text.
 
@@ -1100,7 +1100,7 @@ A constructor used to create a **LruCache** instance. The default capacity of th
 
 | Name  | Type  | Mandatory| Description                        |
 | -------- | ------ | ---- | ---------------------------- |
-| capacity | number | No  | Capacity of the **LruCache** to create.|
+| capacity | number | No  | Capacity of the **LruCache** to create. The default value is **64**.|
 
 **Example**
 
@@ -3400,7 +3400,7 @@ A constructor used to create a **LruBuffer** instance. The default capacity of t
 
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
-| capacity | number | No| Capacity of the **LruBuffer** to create.|
+| capacity | number | No| Capacity of the **LruBuffer** to create. The default value is **64**.|
 
 **Example**
 

en/application-dev/reference/apis/js-apis-vector.md

@@ -304,15 +304,15 @@ Replaces all elements in this container with new elements, and returns the new o
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | callbackFn | function | Yes| Callback invoked for replacement.|
-| thisArg | Object | No| Value to use when the callback is invoked.|
+| thisArg | Object | No| Value of **this** to use when **callbackFn** is invoked. The default value is this instance.|
 
-callbackfn
+callbackFn
 
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | value | T | Yes| Value of the element that is currently traversed.|
-| index | number | No| Position index of the element that is currently traversed.|
-| vector | Vector<T> | No| Instance that invokes the **replaceAllElements** API.|
+| index | number | No| Position index of the element that is currently traversed. The default value is **0**.|
+| vector | Vector<T> | No| Instance that calls the **replaceAllElements** API. The default value is this instance.|
 
 **Example**
 
@@ -342,15 +342,15 @@ Uses a callback to traverse the elements in this container and obtain their posi
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | callbackFn | function | Yes| Callback invoked for replacement.|
-| thisArg | Object | No| Value to use when the callback is invoked.|
+| thisArg | Object | No| Value of **this** to use when **callbackFn** is invoked. The default value is this instance.|
 
-callbackfn
+callbackFn
 
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | value | T | Yes| Value of the element that is currently traversed.|
-| index | number | No| Position index of the element that is currently traversed.|
-| vector | Vector<T> | No| Instance that invokes the **forEach** API.|
+| index | number | No| Position index of the element that is currently traversed. The default value is **0**.|
+| vector | Vector<T> | No| Instance that calls the **forEach** API. The default value is this instance.|
 
 **Example**
 
@@ -378,7 +378,7 @@ Sorts elements in this container.
 
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
-| comparator | function | No| Callback invoked for sorting.|
+| comparator | function | No| Callback invoked for sorting. The default value is this instance.|
 
 comparator
 

en/application-dev/reference/apis/js-apis-xml.md

@@ -381,6 +381,7 @@ Creates and returns an **XmlPullParser** object.
 **Example**
 
 ```js
+import util from '@ohos.util';
 let strXml =
     '<?xml version="1.0" encoding="utf-8"?>' +
     '<!DOCTYPE note [\n<!ENTITY foo "baa">]>' +
@@ -432,6 +433,7 @@ Parses XML information.
 **Example**
 
 ```js
+import util from '@ohos.util';
 let strXml =
             '<?xml version="1.0" encoding="utf-8"?>' +
             '<note importance="high" logged="true">' +
@@ -499,6 +501,7 @@ Obtains the column line number, starting from 1.
 **Example**
 
 ```js
+import util from '@ohos.util';
 let strXml =
             '<?xml version="1.0" encoding="utf-8"?>' +
             '<note importance="high" logged="true">' +
@@ -542,6 +545,7 @@ Obtains the depth of this element.
 **Example**
 
 ```js
+import util from '@ohos.util';
 let strXml =
             '<?xml version="1.0" encoding="utf-8"?>' +
             '<note importance="high" logged="true">' +
@@ -588,6 +592,7 @@ Obtains the current line number, starting from 1.
 **Example**
 
 ```js
+import util from '@ohos.util';
 let strXml =
             '<?xml version="1.0" encoding="utf-8"?>' +
             '<note importance="high" logged="true">' +
@@ -631,6 +636,7 @@ Obtains the name of this element.
 **Example**
 
 ```js
+import util from '@ohos.util';
 let strXml =
             '<?xml version="1.0" encoding="utf-8"?>' +
             '<note importance="high" logged="true">' +
@@ -673,6 +679,7 @@ Obtains the namespace of this element.
 **Example**
 
 ```js
+import util from '@ohos.util';
 let strXml =
             '<?xml version="1.0" encoding="utf-8"?>' +
             '<note importance="high" logged="true">' +
@@ -715,6 +722,7 @@ Obtains the prefix of this element.
 **Example**
 
 ```js
+import util from '@ohos.util';
 let strXml =
             '<?xml version="1.0" encoding="utf-8"?>' +
             '<note importance="high" logged="true">' +
@@ -758,6 +766,7 @@ Obtains the text of the current event.
 **Example**
 
 ```js
+import util from '@ohos.util';
 let strXml =
             '<?xml version="1.0" encoding="utf-8"?>' +
             '<note importance="high" logged="true">' +
@@ -800,6 +809,7 @@ Checks whether the current element is empty.
 **Example**
 
 ```js
+import util from '@ohos.util';
 let strXml =
             '<?xml version="1.0" encoding="utf-8"?>' +
             '<note importance="high" logged="true">' +
@@ -842,6 +852,7 @@ Checks whether the current text event contains only whitespace characters.
 **Example**
 
 ```js
+import util from '@ohos.util';
 let strXml =
             '<?xml version="1.0" encoding="utf-8"?>' +
             '<note importance="high" logged="true">' +
@@ -883,6 +894,7 @@ Obtains the number of attributes for the current start tag.
 **Example**
 
 ```js
+import util from '@ohos.util';
 let strXml =
             '<?xml version="1.0" encoding="utf-8"?>' +
             '<note importance="high" logged="true">' +