diff --git a/en/application-dev/reference/apis/js-apis-buffer.md b/en/application-dev/reference/apis/js-apis-buffer.md
index 5a014e7cfe5618c7e31741b43d32ce743d86a0b2..737c9f1dbf05e30e2f84e185b89e804642b0c39f 100644
--- a/en/application-dev/reference/apis/js-apis-buffer.md
+++ b/en/application-dev/reference/apis/js-apis-buffer.md
@@ -726,7 +726,7 @@ Checks whether this **Buffer** instance contains the specified value.
 | -------- | -------- | -------- | -------- |
 | value | string \| number \| Buffer \| Uint8Array | Yes| Value to match.|
 | byteOffset | number | No| Number of bytes to skip before starting to check data. If the offset is a negative number, data is checked from the end of the **Buffer** instance. The default value is **0**.|
-| encoding | [BufferEncoding](#bufferencoding) | No| Encoding format used if **value** is a string. The default value is **utf-8**.|
+| encoding | [BufferEncoding](#bufferencoding) | No| Encoding format (valid only when **value** is a string). The default value is **utf-8**.|
 
 **Return value**
 
@@ -758,7 +758,7 @@ Obtains the index of the first occurrence of the specified value in this **Buffe
 | -------- | -------- | -------- | -------- |
 | value | string \| number \| Buffer \| Uint8Array | Yes| Value to match.|
 | byteOffset | number | No| Number of bytes to skip before starting to check data. If the offset is a negative number, data is checked from the end of the **Buffer** instance. The default value is **0**.|
-| encoding | [BufferEncoding](#bufferencoding) | No| Encoding format used if **value** is a string. The default value is **utf-8**.|
+| encoding | [BufferEncoding](#bufferencoding) | No| Encoding format (valid only when **value** is a string). The default value is **utf-8**.|
 
 **Return value**
 
@@ -815,7 +815,7 @@ Obtains the index of the last occurrence of the specified value in this **Buffer
 | -------- | -------- | -------- | -------- |
 | value | string \| number \| Buffer \| Uint8Array | Yes| Value to match.|
 | byteOffset | number | No| Number of bytes to skip before starting to check data. If the offset is a negative number, data is checked from the end of the **Buffer** instance. The default value is **0**.|
-| encoding | [BufferEncoding](#bufferencoding) | No| Encoding format used if **value** is a string. The default value is **utf-8**.|
+| encoding | [BufferEncoding](#bufferencoding) | No| Encoding format (valid only when **value** is a string). The default value is **utf-8**.|
 
 **Return value**
 
@@ -838,7 +838,7 @@ console.log(buf.lastIndexOf('buffer').toString());	// Print: 17
 
 readBigInt64BE(offset?: number): bigint
 
-Reads a signed, big-endian 64-bit big integer from this **Buffer** instance at the specified offset.
+Reads a 64-bit, big-endian, signed big integer from this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -872,14 +872,14 @@ let buf = buffer.from([0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x70,
 console.log(buf.readBigInt64BE(0).toString());
 
 let buf1 = buffer.allocUninitializedFromPool(8);
-let result = buf1.writeBigInt64BE(0x0102030405060708n, 0);
+let result = buf1.writeBigInt64BE(BigInt(0x0102030405060708), 0);
 ```
 
 ### readBigInt64LE
 
 readBigInt64LE(offset?: number): bigint
 
-Reads a signed, little-endian 64-bit big integer from this **Buffer** instance at the specified offset.
+Reads a 64-bit, little-endian, signed big integer from this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -913,14 +913,14 @@ let buf = buffer.from([0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x70,
 console.log(buf.readBigInt64LE(0).toString());
 
 let buf1 = buffer.allocUninitializedFromPool(8);
-let result = buf1.writeBigInt64BE(0x0102030405060708n, 0);
+let result = buf1.writeBigInt64BE(BigInt(0x0102030405060708), 0);
 ```
 
 ### readBigUInt64BE
 
 readBigUInt64BE(offset?: number): bigint
 
-Reads an unsigned, big-endian 64-bit big integer from this **Buffer** instance at the specified offset.
+Reads a 64-bit, big-endian, unsigned big integer from this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -954,14 +954,14 @@ let buf = buffer.from([0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x70,
 console.log(buf.readBigUInt64BE(0).toString());
 
 let buf1 = buffer.allocUninitializedFromPool(8);
-let result = buf1.writeBigUInt64BE(0xdecafafecacefaden, 0);
+let result = buf1.writeBigUInt64BE(BigInt(0xdecafafecacefade), 0);
 ```
 
 ### readBigUInt64LE
 
 readBigUInt64LE(offset?: number): bigint
 
-Reads an unsigned, little-endian 64-bit big integer from this **Buffer** instance at the specified offset.
+Reads a 64-bit, little-endian, unsigned big integer from this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -995,14 +995,14 @@ let buf = buffer.from([0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x70,
 console.log(buf.readBigUInt64LE(0).toString());
 
 let buf1 = buffer.allocUninitializedFromPool(8);
-let result = buf1.writeBigUInt64BE(0xdecafafecacefaden, 0);
+let result = buf1.writeBigUInt64BE(BigInt(0xdecafafecacefade), 0);
 ```
 
 ### readDoubleBE
 
 readDoubleBE(offset?: number): number
 
-Reads a 64-bit, big-endian floating-point number from this **Buffer** instance at the specified offset.
+Reads a 64-bit, big-endian, double-precision floating-point number from this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -1042,7 +1042,7 @@ let result = buf1.writeDoubleBE(123.456, 0);
 
 readDoubleLE(offset?: number): number
 
-Reads a 64-bit, little-endian floating-point number from this **Buffer** instance at the specified offset.
+Reads a 64-bit, little-endian, double-precision floating-point number from this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -1082,7 +1082,7 @@ let result = buf1.writeDoubleLE(123.456, 0);
 
 readFloatBE(offset?: number): number
 
-Reads a 32-bit, big-endian floating-point number from this **Buffer** instance at the specified offset.
+Reads a 32-bit, big-endian, single-precision floating-point number from this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -1122,7 +1122,7 @@ let result = buf1.writeFloatBE(0xcabcbcbc, 0);
 
 readFloatLE(offset?: number): number
 
-Reads a 32-bit, little-endian floating-point number from this **Buffer** instance at the specified offset.
+Reads a 32-bit, little-endian, single-precision floating-point number from this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -1162,7 +1162,7 @@ let result = buf1.writeFloatLE(0xcabcbcbc, 0);
 
 readInt8(offset?: number): number
 
-Reads a signed 8-bit integer from this **Buffer** instance at the specified offset.
+Reads a 8-bit signed integer from this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -1203,7 +1203,7 @@ let result = buf1.writeInt8(0x12);
 
 readInt16BE(offset?: number): number
 
-Reads a signed, big-endian 16-bit integer from this **Buffer** instance at the specified offset.
+Reads a 16-bit, big-endian, signed integer from this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -1243,7 +1243,7 @@ let result = buf1.writeInt16BE(0x1234, 0);
 
 readInt16LE(offset?: number): number
 
-Reads a signed, little-endian 16-bit integer from this **Buffer** instance at the specified offset.
+Reads a 16-bit, little-endian, signed integer from this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -1283,7 +1283,7 @@ let result = buf1.writeInt16BE(0x1234, 0);
 
 readInt32BE(offset?: number): number
 
-Reads a signed, big-endian 32-bit integer from this **Buffer** instance at the specified offset.
+Reads a 32-bit, big-endian, signed integer from this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -1323,7 +1323,7 @@ let result = buf1.writeInt32BE(0x12345678, 0);
 
 readInt32LE(offset?: number): number
 
-Reads a signed, little-endian 32-bit integer from this **Buffer** instance at the specified offset.
+Reads a 32-bit, little-endian, signed integer from this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -1449,7 +1449,7 @@ let result = buf1.writeIntLE(0x123456789011, 0, 6);
 
 readUInt8(offset?: number): number
 
-Reads an unsigned 8-bit integer from this **Buffer** instance at the specified offset.
+Reads a 8-bit unsigned integer from this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -1491,7 +1491,7 @@ let result = buf1.writeUInt8(0x42);
 
 readUInt16BE(offset?: number): number
 
-Reads an unsigned, big-endian 16-bit integer from this **Buffer** instance at the specified offset.
+Reads a 16-bit, big-endian, unsigned integer from this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -1533,7 +1533,7 @@ let result = buf1.writeUInt16BE(0x1234, 0);
 
 readUInt16LE(offset?: number): number
 
-Reads an unsigned, little-endian 16-bit integer from this **Buffer** instance at the specified offset.
+Reads a 16-bit, little-endian, unsigned integer from this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -1575,7 +1575,7 @@ let result = buf1.writeUInt16LE(0x1234, 0);
 
 readUInt32BE(offset?: number): number
 
-Reads an unsigned, big-endian 32-bit integer from this **Buffer** instance at the specified offset.
+Reads a 32-bit, big-endian, unsigned integer from this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -1616,7 +1616,7 @@ let result = buf1.writeUInt32BE(0x12345678, 0);
 
 readUInt32LE(offset?: number): number
 
-Reads an unsigned, little-endian 32-bit integer from this **Buffer** instance at the specified offset.
+Reads a 32-bit, little-endian, unsigned integer from this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -2013,7 +2013,7 @@ let length = buffer1.write('abcd', 8);
 
 writeBigInt64BE(value: bigint, offset?: number): number
 
-Writes a signed, big-endian 64-bit Big integer to this **Buffer** instance at the specified offset.
+Writes a 64-bit, big-endian, signed big integer to this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -2045,14 +2045,14 @@ For details about the error codes, see [Utils Error Codes](../errorcodes/errorco
 import buffer from '@ohos.buffer';
 
 let buf = buffer.allocUninitializedFromPool(8);
-let result = buf.writeBigInt64BE(0x0102030405060708n, 0);
+let result = buf.writeBigInt64BE(BigInt(0x0102030405060708), 0);
 ```
 
 ### writeBigInt64LE
 
 writeBigInt64LE(value: bigint, offset?: number): number
 
-Writes a signed, little-endian 64-bit Big integer to this **Buffer** instance at the specified offset.
+Writes a 64-bit, little-endian, signed big integer to this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -2084,14 +2084,14 @@ For details about the error codes, see [Utils Error Codes](../errorcodes/errorco
 import buffer from '@ohos.buffer';
 
 let buf = buffer.allocUninitializedFromPool(8);
-let result = buf.writeBigInt64LE(0x0102030405060708n, 0);
+let result = buf.writeBigInt64LE(BigInt(0x0102030405060708), 0);
 ```
 
 ### writeBigUInt64BE
 
 writeBigUInt64BE(value: bigint, offset?: number): number
 
-Writes an unsigned, big-endian 64-bit Big integer to this **Buffer** instance at the specified offset.
+Writes a 64-bit, big-endian, unsigned big integer to this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -2123,14 +2123,14 @@ For details about the error codes, see [Utils Error Codes](../errorcodes/errorco
 import buffer from '@ohos.buffer';
 
 let buf = buffer.allocUninitializedFromPool(8);
-let result = buf.writeBigUInt64BE(0xdecafafecacefaden, 0);
+let result = buf.writeBigUInt64BE(BigInt(0xdecafafecacefade), 0);
 ```
 
 ### writeBigUInt64LE
 
 writeBigUInt64LE(value: bigint, offset?: number): number
 
-Writes an unsigned, little-endian 64-bit Big integer to this **Buffer** instance at the specified offset.
+Writes a 64-bit, little-endian, unsigned big integer to this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -2162,14 +2162,14 @@ For details about the error codes, see [Utils Error Codes](../errorcodes/errorco
 import buffer from '@ohos.buffer';
 
 let buf = buffer.allocUninitializedFromPool(8);
-let result = buf.writeBigUInt64LE(0xdecafafecacefaden, 0);
+let result = buf.writeBigUInt64LE(BigInt(0xdecafafecacefade), 0);
 ```
 
 ### writeDoubleBE
 
 writeDoubleBE(value: number, offset?: number): number
 
-Writes a big-endian double-precision floating-point number to this **Buffer** instance at the specified offset.
+Writes a 64-bit, big-endian, double-precision floating-point number to this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -2208,7 +2208,7 @@ let result = buf.writeDoubleBE(123.456, 0);
 
 writeDoubleLE(value: number, offset?: number): number
 
-Writes a little-endian double-precision floating-point number to this **Buffer** instance at the specified offset.
+Writes a 64-bit, little-endian, double-precision floating-point number to this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -2247,7 +2247,7 @@ let result = buf.writeDoubleLE(123.456, 0);
 
 writeFloatBE(value: number, offset?: number): number
 
-Writes a big-endian single-precision floating-point number to this **Buffer** instance at the specified offset.
+Writes a 32-bit, big-endian, single-precision floating-point number to this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -2287,7 +2287,7 @@ let result = buf.writeFloatBE(0xcafebabe, 0);
 
 writeFloatLE(value: number, offset?: number): number
 
-Writes a little-endian single-precision floating-point number to this **Buffer** instance at the specified offset.
+Writes a 32-bit, little-endian, single-precision floating-point number to this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -2326,7 +2326,7 @@ let result = buf.writeFloatLE(0xcafebabe, 0);
 
 writeInt8(value: number, offset?: number): number
 
-Writes a signed 8-bit integer to this **Buffer** instance at the specified offset.
+Writes a 8-bit signed integer to this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -2367,7 +2367,7 @@ let result1 = buf.writeInt8(-2, 1);
 
 writeInt16BE(value: number, offset?: number): number
 
-Writes a signed, big-endian 16-bit integer to this **Buffer** instance at the specified offset.
+Writes a 16-bit, big-endian, signed integer to this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -2407,7 +2407,7 @@ let result = buf.writeInt16BE(0x0102, 0);
 
 writeInt16LE(value: number, offset?: number): number
 
-Writes a signed, little-endian 16-bit integer to this **Buffer** instance at the specified offset.
+Writes a 16-bit, little-endian, signed integer to this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -2446,7 +2446,7 @@ let result = buf.writeInt16LE(0x0304, 0);
 
 writeInt32BE(value: number, offset?: number): number
 
-Writes a signed, big-endian 32-bit integer to this **Buffer** instance at the specified offset.
+Writes a 32-bit, big-endian, signed integer to this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -2486,7 +2486,7 @@ let result = buf.writeInt32BE(0x01020304, 0);
 
 writeInt32LE(value: number, offset?: number): number
 
-Writes a signed, little-endian 32-bit integer to this **Buffer** instance at the specified offset.
+Writes a 32-bit, little-endian, signed integer to this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -2606,7 +2606,7 @@ let result = buf.writeIntLE(0x1234567890ab, 0, 6);
 
 writeUInt8(value: number, offset?: number): number
 
-Writes an unsigned 8-bit integer to this **Buffer** instance at the specified offset.
+Writes a 8-bit unsigned integer to this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -2648,7 +2648,7 @@ let result3 = buf.writeUInt8(0x42, 3);
 
 writeUInt16BE(value: number, offset?: number): number
 
-Writes an unsigned, big-endian 16-bit integer to this **Buffer** instance at the specified offset.
+Writes a 16-bit, big-endian, unsigned integer to this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -2688,7 +2688,7 @@ let result1 = buf.writeUInt16BE(0xbeef, 2);
 
 writeUInt16LE(value: number, offset?: number): number
 
-Writes an unsigned, little-endian 16-bit integer to this **Buffer** instance at the specified offset.
+Writes a 16-bit, little-endian, unsigned integer to this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -2728,7 +2728,7 @@ let result1 = buf.writeUInt16LE(0xbeef, 2);
 
 writeUInt32BE(value: number, offset?: number): number
 
-Writes an unsigned, big-endian 32-bit integer to this **Buffer** instance at the specified offset.
+Writes a 32-bit, big-endian, unsigned integer to this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -2767,7 +2767,7 @@ let result = buf.writeUInt32BE(0xfeedface, 0);
 
 writeUInt32LE(value: number, offset?: number): number
 
-Writes an unsigned, little-endian 32-bit integer to this **Buffer** instance at the specified offset.
+Writes a 32-bit, little-endian, unsigned integer to this **Buffer** instance at the specified offset.
 
 **System capability**: SystemCapability.Utils.Lang
 
diff --git a/en/application-dev/reference/apis/js-apis-convertxml.md b/en/application-dev/reference/apis/js-apis-convertxml.md
index 4c66c928fb7ee6c5482d39db7b39acaa6793691e..8aad8fdf810b9f3246672b8c3d2e21df7733d94e 100644
--- a/en/application-dev/reference/apis/js-apis-convertxml.md
+++ b/en/application-dev/reference/apis/js-apis-convertxml.md
@@ -28,7 +28,7 @@ Converts an XML text into a JavaScript object.
 | Name | Type                             | Mandatory| Description           |
 | ------- | --------------------------------- | ---- | --------------- |
 | xml     | string                            | Yes  | XML text to convert.|
-| options | [ConvertOptions](#convertoptions) | No  | Options for conversion.     |
+| options | [ConvertOptions](#convertoptions) | No  | Options for conversion. The default value is a **ConvertOptions** object, which consists of the default values of the attributes in the object. |
 
 **Return value**
 
@@ -89,7 +89,7 @@ Converts an XML text into a JavaScript object.
 | Name | Type                             | Mandatory| Description           |
 | ------- | --------------------------------- | ---- | --------------- |
 | xml     | string                            | Yes  | XML text to convert.|
-| options | [ConvertOptions](#convertoptions) | No  | Options for conversion.     |
+| options | [ConvertOptions](#convertoptions) | No  | Options for conversion. The default value is a **ConvertOptions** object, which consists of the default values of the attributes in the object. |
 
 **Return value**
 
diff --git a/en/application-dev/reference/apis/js-apis-url.md b/en/application-dev/reference/apis/js-apis-url.md
index baeb122c19fccf1a1005b46e98604cb883976256..407929f734381a155dea2be72b2842a6730ecfc6 100755
--- a/en/application-dev/reference/apis/js-apis-url.md
+++ b/en/application-dev/reference/apis/js-apis-url.md
@@ -23,7 +23,7 @@ A constructor used to create a **URLParams** instance.
 
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
-| init | string[][] \| Record&lt;string, string&gt; \| string \| URLSearchParams | No| Input parameter objects, which include the following:<br>- **string[][]**: two-dimensional string array<br>- **Record&lt;string, string&gt;**: list of objects<br>- **string**: string<br>- **URLSearchParams**: object|
+| init | string[][] \| Record&lt;string, string&gt; \| string \| URLSearchParams | No| Input parameter objects, which include the following:<br>- **string[][]**: two-dimensional string array<br>- **Record&lt;string, string&gt;**: list of objects<br>- **string**: string<br>- **URLSearchParams**: object<br>The default value is **null**.|
 
 **Example**
 
@@ -150,7 +150,7 @@ Traverses the key-value pairs in the **URLSearchParams** instance by using a cal
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | callbackFn | function | Yes| Callback invoked to traverse the key-value pairs in the **URLSearchParams** instance.|
-| 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 object.|
 
 **Table 1** callbackFn parameter description
 
@@ -404,7 +404,7 @@ Creates a URL.
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | url | string | Yes| Input object.|
-| base | string \| URL | No| Input parameter, which can be any of the following:<br>- **string**: string<br>- **URL**: string or object|
+| base | string \| URL | No| Input parameter, which can be any of the following:<br>- **string**: string<br>- **URL**: string or object<br>The default value is an empty string or an empty object.|
 
 **Example**
 
@@ -444,7 +444,7 @@ Parses a URL.
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | url | string | Yes| Input object.|
-| base | string \| URL | No| Input parameter, which can be any of the following:<br>- **string**: string<br>- **URL**: string or object|
+| base | string \| URL | No| Input parameter, which can be any of the following:<br>- **string**: string<br>- **URL**: string or object<br>The default value is an empty string or an empty object.|
 
 **Error codes**
 
@@ -522,7 +522,7 @@ A constructor used to create a **URLSearchParams** instance.
 
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
-| init | string[][] \| Record&lt;string, string&gt; \| string \| URLSearchParams | No| Input parameter objects, which include the following:<br>- **string[][]**: two-dimensional string array<br>- **Record&lt;string, string&gt;**: list of objects<br>- **string**: string<br>- **URLSearchParams**: object|
+| init | string[][] \| Record&lt;string, string&gt; \| string \| URLSearchParams | No| Input parameter objects, which include the following:<br>- **string[][]**: two-dimensional string array<br>- **Record&lt;string, string&gt;**: list of objects<br>- **string**: string<br>- **URLSearchParams**: object<br>The default value is **null**.|
 
 **Example**
 
@@ -665,7 +665,7 @@ Traverses the key-value pairs in the **URLSearchParams** instance by using a cal
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
 | callbackFn | function | Yes| Callback invoked to traverse the key-value pairs in the **URLSearchParams** instance.|
-| 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 object.|
 
 **Table 1** callbackFn parameter description
 
diff --git a/en/application-dev/reference/apis/js-apis-util.md b/en/application-dev/reference/apis/js-apis-util.md
index 1a60dc51ae1404aee3947f799c166180ac13dde2..6600939a007d9ac3abd1ad964f3270445cec3a7e 100755
--- a/en/application-dev/reference/apis/js-apis-util.md
+++ b/en/application-dev/reference/apis/js-apis-util.md
@@ -547,7 +547,7 @@ A constructor used to create a **TextEncoder** object.
 
 | Name| Type| Mandatory| Description|
 | ----- | ---- | ---- | ---- |
-| encoding | string | No| Encoding format.|
+| encoding | string | No| Encoding format. The default format is **'utf-8'**.|
 
 **Example**
 
@@ -567,7 +567,7 @@ Encodes the input content.
 
 | Name| Type  | Mandatory| Description              |
 | ------ | ------ | ---- | ------------------ |
-| input  | string | No  | String to encode.|
+| input  | string | No  | String to encode. The default value is an empty string.|
 
 **Return value**
 
@@ -665,7 +665,7 @@ Encodes the input content.
 
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
-| input | string | No| String to encode.|
+| input | string | No| String to encode. The default value is an empty string.|
 
 **Return value**
 
@@ -1646,18 +1646,18 @@ Create a class to implement the **compareTo** method. The **Temperature** class
 
 ```js
 class Temperature{
-    constructor(value){
-       // If TS is used for development, add the following code:
-       // private readonly _temp: Temperature;
+    // If ArkTS is used for development, add the following code:
+    // private readonly _temp: Temperature;
+    constructor(value) {
        this._temp = value;
     }
-    compareTo(value){
+    compareTo(value) {
        return this._temp >= value.getTemp();
     }
-    getTemp(){
+    getTemp() {
        return this._temp;
     }
-    toString(){
+    toString() {
        return this._temp.toString();
     }
 }
diff --git a/en/application-dev/reference/apis/js-apis-xml.md b/en/application-dev/reference/apis/js-apis-xml.md
index 5259aede120c7b89b0ade477f8fb1bb27490cc1a..f8e8f0fff5917b56be67e1f3ab0b21ac949e7ee3 100644
--- a/en/application-dev/reference/apis/js-apis-xml.md
+++ b/en/application-dev/reference/apis/js-apis-xml.md
@@ -27,13 +27,13 @@ A constructor used to create an **XmlSerializer** instance.
 | Name  | Type                             | Mandatory| Description                                            |
 | -------- | --------------------------------- | ---- | ------------------------------------------------ |
 | buffer   | ArrayBuffer \| DataView | Yes  | **ArrayBuffer** or **DataView** for storing the XML information to write.|
-| encoding | string                            | No  | Encoding format.                                      |
+| encoding | string                            | No  | Encoding format. The default value is **'utf-8'** (the only format currently supported).              |
 
 **Example**
 
 ```js
 let arrayBuffer = new ArrayBuffer(2048);
-let thatSer = new xml.XmlSerializer(arrayBuffer,"utf-8");
+let thatSer = new xml.XmlSerializer(arrayBuffer, "utf-8");
 thatSer.setDeclaration();
 let result = '<?xml version="1.0" encoding="utf-8"?>';
 let view = new Uint8Array(arrayBuffer);
@@ -363,11 +363,11 @@ console.log(view1) //'<!DOCTYPE root SYSTEM "http://www.test.org/test.dtd">'
 ## XmlPullParser
 
 
-### XmlPullParser
+### constructor
 
 constructor(buffer: ArrayBuffer | DataView, encoding?: string)
 
-Creates and returns an **XmlPullParser** object. The **XmlPullParser** object passes two parameters. The first parameter is the memory of the **ArrayBuffer** or **DataView** type, and the second parameter is the file format (UTF-8 by default).
+Creates and returns an **XmlPullParser** object.
 
 **System capability**: SystemCapability.Utils.Lang
 
@@ -375,8 +375,8 @@ Creates and returns an **XmlPullParser** object. The **XmlPullParser** object pa
 
 | Name  | Type                             | Mandatory| Description                                      |
 | -------- | --------------------------------- | ---- | ------------------------------------------ |
-| buffer   | ArrayBuffer \| DataView | Yes  | **ArrayBuffer** or **DataView** that contains XML text information.|
-| encoding | string                            | No  | Encoding format. Only UTF-8 is supported.                 |
+| buffer   | ArrayBuffer \| DataView | Yes  | XML text information to be parsed.|
+| encoding | string                            | No  | Encoding format. The default value is **'utf-8'** (the only format currently supported).        |
 
 **Example**
 
@@ -401,13 +401,9 @@ let strXml =
     '        </h:tr>' +
     '    </h:table>' +
     '</note>';
-let arrayBuffer = new ArrayBuffer(strXml.length);
-let bufView = new Uint8Array(arrayBuffer);
-let strLen = strXml.length;
-for (let i = 0; i < strLen; ++i) {
-    bufView[i] = strXml.charCodeAt(i);
-}
-let that = new xml.XmlPullParser(arrayBuffer, 'UTF-8');
+let textEncoder = new util.TextEncoder();
+let arrbuffer = textEncoder.encodeInto(strXml);
+let that = new xml.XmlPullParser(arrbuffer.buffer, 'UTF-8');
 let str1 = '';
 function func1(name, value){
     str1 += name+':'+value;
@@ -443,13 +439,9 @@ let strXml =
             '    <todo>Work</todo>' +
             '    <todo>Play</todo>' +
             '</note>';
-let arrayBuffer = new ArrayBuffer(strXml.length);
-let bufView = new Uint8Array(arrayBuffer);
-let strLen = strXml.length;
-for (let tmp = 0; tmp < strLen; ++tmp) {
-    bufView[tmp] = strXml.charCodeAt(tmp);
-}
-let that = new xml.XmlPullParser(arrayBuffer);
+let textEncoder = new util.TextEncoder();
+let arrbuffer = textEncoder.encodeInto(strXml);
+let that = new xml.XmlPullParser(arrbuffer.buffer);
 let arrTag = {};
 let str = "";
 let i = 0;
@@ -481,9 +473,9 @@ Defines the XML parsing options.
 | ------------------------------ | ------------------------------------------------------------ | ---- | --------------------------------------- |
 | supportDoctype                 | boolean                                                      | No  | Whether to ignore **Doctype**. The default value is **false**.|
 | ignoreNameSpace                | boolean                                                      | No  | Whether to ignore **Namespace**. The default value is **false**.         |
-| tagValueCallbackFunction       | (name: string, value: string) =&gt; boolean | No  | Callback used to return **tagValue**.                 |
-| attributeValueCallbackFunction | (name: string, value: string) =&gt; boolean | No  | Callback used to return **attributeValue**.           |
-| tokenValueCallbackFunction     | (eventType: [EventType](#eventtype), value: [ParseInfo](#parseinfo)) =&gt; boolean | No  | Callback used to return **tokenValue**.               |
+| tagValueCallbackFunction       | (name: string, value: string) =&gt; boolean | No  | Callback used to return **tagValue**. The default value is **null**.                 |
+| attributeValueCallbackFunction | (name: string, value: string) =&gt; boolean | No  | Callback used to return **attributeValue**. The default value is **null**.           |
+| tokenValueCallbackFunction     | (eventType: [EventType](#eventtype), value: [ParseInfo](#parseinfo)) =&gt; boolean | No  | Callback used to return **tokenValue**. The default value is **null**.    |
 
 ## ParseInfo
 
@@ -514,13 +506,9 @@ let strXml =
             '    <todo>Work</todo>' +
             '    <todo>Play</todo>' +
             '</note>';
-let arrayBuffer = new ArrayBuffer(strXml.length);
-let bufView = new Uint8Array(arrayBuffer);
-let strLen = strXml.length;
-for (let tmp = 0; tmp < strLen; ++tmp) {
-    bufView[tmp] = strXml.charCodeAt(tmp);
-}
-let that = new xml.XmlPullParser(arrayBuffer);
+let textEncoder = new util.TextEncoder();
+let arrbuffer = textEncoder.encodeInto(strXml);
+let that = new xml.XmlPullParser(arrbuffer.buffer);
 let arrTag = {};
 let str = "";
 let i = 0;
@@ -561,13 +549,9 @@ let strXml =
             '    <todo>Work</todo>' +
             '    <todo>Play</todo>' +
             '</note>';
-let arrayBuffer = new ArrayBuffer(strXml.length);
-let bufView = new Uint8Array(arrayBuffer);
-let strLen = strXml.length;
-for (let tmp = 0; tmp < strLen; ++tmp) {
-    bufView[tmp] = strXml.charCodeAt(tmp);
-}
-let that = new xml.XmlPullParser(arrayBuffer);
+let textEncoder = new util.TextEncoder();
+let arrbuffer = textEncoder.encodeInto(strXml);
+let that = new xml.XmlPullParser(arrbuffer.buffer);
 let arrTag = {};
 let str = "";
 let i = 0;
@@ -611,13 +595,9 @@ let strXml =
             '    <todo>Work</todo>' +
             '    <todo>Play</todo>' +
             '</note>';
-let arrayBuffer = new ArrayBuffer(strXml.length);
-let bufView = new Uint8Array(arrayBuffer);
-let strLen = strXml.length;
-for (let tmp = 0; tmp < strLen; ++tmp) {
-    bufView[tmp] = strXml.charCodeAt(tmp);
-}
-let that = new xml.XmlPullParser(arrayBuffer);
+let textEncoder = new util.TextEncoder();
+let arrbuffer = textEncoder.encodeInto(strXml);
+let that = new xml.XmlPullParser(arrbuffer.buffer);
 let arrTag = {};
 let str = "";
 let i = 0;
@@ -658,13 +638,9 @@ let strXml =
             '    <todo>Work</todo>' +
             '    <todo>Play</todo>' +
             '</note>';
-let arrayBuffer = new ArrayBuffer(strXml.length);
-let bufView = new Uint8Array(arrayBuffer);
-let strLen = strXml.length;
-for (let tmp = 0; tmp < strLen; ++tmp) {
-    bufView[tmp] = strXml.charCodeAt(tmp);
-}
-let that = new xml.XmlPullParser(arrayBuffer);
+let textEncoder = new util.TextEncoder();
+let arrbuffer = textEncoder.encodeInto(strXml);
+let that = new xml.XmlPullParser(arrbuffer.buffer);
 let arrTag = {};
 let str = "";
 let i = 0;
@@ -704,13 +680,9 @@ let strXml =
             '    <todo>Work</todo>' +
             '    <todo>Play</todo>' +
             '</note>';
-let arrayBuffer = new ArrayBuffer(strXml.length);
-let bufView = new Uint8Array(arrayBuffer);
-let strLen = strXml.length;
-for (let tmp = 0; tmp < strLen; ++tmp) {
-    bufView[tmp] = strXml.charCodeAt(tmp);
-}
-let that = new xml.XmlPullParser(arrayBuffer);
+let textEncoder = new util.TextEncoder();
+let arrbuffer = textEncoder.encodeInto(strXml);
+let that = new xml.XmlPullParser(arrbuffer.buffer);
 let arrTag = {};
 let str = "";
 let i = 0;
@@ -750,13 +722,9 @@ let strXml =
             '    <todo>Work</todo>' +
             '    <todo>Play</todo>' +
             '</note>';
-let arrayBuffer = new ArrayBuffer(strXml.length);
-let bufView = new Uint8Array(arrayBuffer);
-let strLen = strXml.length;
-for (let tmp = 0; tmp < strLen; ++tmp) {
-    bufView[tmp] = strXml.charCodeAt(tmp);
-}
-let that = new xml.XmlPullParser(arrayBuffer);
+let textEncoder = new util.TextEncoder();
+let arrbuffer = textEncoder.encodeInto(strXml);
+let that = new xml.XmlPullParser(arrbuffer.buffer);
 let arrTag = {};
 let str = "";
 let i = 0;
@@ -797,13 +765,9 @@ let strXml =
             '    <todo>Work</todo>' +
             '    <todo>Play</todo>' +
             '</note>';
-let arrayBuffer = new ArrayBuffer(strXml.length);
-let bufView = new Uint8Array(arrayBuffer);
-let strLen = strXml.length;
-for (let tmp = 0; tmp < strLen; ++tmp) {
-    bufView[tmp] = strXml.charCodeAt(tmp);
-}
-let that = new xml.XmlPullParser(arrayBuffer);
+let textEncoder = new util.TextEncoder();
+let arrbuffer = textEncoder.encodeInto(strXml);
+let that = new xml.XmlPullParser(arrbuffer.buffer);
 let arrTag = {};
 let str = "";
 let i = 0;
@@ -843,13 +807,9 @@ let strXml =
             '    <todo>Work</todo>' +
             '    <todo>Play</todo>' +
             '</note>';
-let arrayBuffer = new ArrayBuffer(strXml.length);
-let bufView = new Uint8Array(arrayBuffer);
-let strLen = strXml.length;
-for (let tmp = 0; tmp < strLen; ++tmp) {
-    bufView[tmp] = strXml.charCodeAt(tmp);
-}
-let that = new xml.XmlPullParser(arrayBuffer);
+let textEncoder = new util.TextEncoder();
+let arrbuffer = textEncoder.encodeInto(strXml);
+let that = new xml.XmlPullParser(arrbuffer.buffer);
 let arrTag = {};
 let str = "";
 let i = 0;
@@ -889,13 +849,9 @@ let strXml =
             '    <todo>Work</todo>' +
             '    <todo>Play</todo>' +
             '</note>';
-let arrayBuffer = new ArrayBuffer(strXml.length);
-let bufView = new Uint8Array(arrayBuffer);
-let strLen = strXml.length;
-for (let tmp = 0; tmp < strLen; ++tmp) {
-    bufView[tmp] = strXml.charCodeAt(tmp);
-}
-let that = new xml.XmlPullParser(arrayBuffer);
+let textEncoder = new util.TextEncoder();
+let arrbuffer = textEncoder.encodeInto(strXml);
+let that = new xml.XmlPullParser(arrbuffer.buffer);
 let arrTag = {};
 let str = "";
 let i = 0;
@@ -934,13 +890,9 @@ let strXml =
             '    <todo>Work</todo>' +
             '    <todo>Play</todo>' +
             '</note>';
-let arrayBuffer = new ArrayBuffer(strXml.length);
-let bufView = new Uint8Array(arrayBuffer);
-let strLen = strXml.length;
-for (let tmp = 0; tmp < strLen; ++tmp) {
-    bufView[tmp] = strXml.charCodeAt(tmp);
-}
-let that = new xml.XmlPullParser(arrayBuffer);
+let textEncoder = new util.TextEncoder();
+let arrbuffer = textEncoder.encodeInto(strXml);
+let that = new xml.XmlPullParser(arrbuffer.buffer);
 let arrTag = {};
 let str = "";
 let i = 0;