@ohos.xml (xml解析与生成)

本模块提供了将XML文本转换为JavaScript对象、以及XML文件生成和解析的一系列接口。

说明：

本模块首批接口从API version 8开始支持。后续版本的新增接口，采用上角标单独标记接口的起始版本。

导入模块

import xml from '@ohos.xml';

XmlSerializer

XmlSerializer接口用于生成XML文件。

constructor

constructor(buffer: ArrayBuffer | DataView, encoding?: string)

XmlSerializer的构造函数。

系统能力： SystemCapability.Utils.Lang

参数：

示例：

let arrayBuffer = new ArrayBuffer(2048);
let thatSer = new xml.XmlSerializer(arrayBuffer, "utf-8");
thatSer.setDeclaration();
let result = '<?xml version="1.0" encoding="utf-8"?>';
let view = new Uint8Array(arrayBuffer);
let view1 = "";
for (let i = 0; i < result.length; ++i) {
    view1 = view1 + String.fromCodePoint(view[i]);
}
console.log(view1) // <?xml version="1.0" encoding="utf-8"?>

setAttributes

setAttributes(name: string, value: string): void

写入元素的属性和属性值。

系统能力： SystemCapability.Utils.Lang

参数：

示例：

const MY_MAX = 2048;
let arrayBuffer = new ArrayBuffer(MY_MAX);
let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.startElement("note");
thatSer.setAttributes("importance1", "high1");
thatSer.endElement();
let result = '<note importance1="high1"/>';
let view = new Uint8Array(arrayBuffer);
let view1 = "";
for (let i = 0; i < result.length; ++i) {
    view1 = view1 + String.fromCodePoint(view[i]);
}
console.log(view1) // <note importance1="high1"/>

addEmptyElement

addEmptyElement(name: string): void

写入一个空元素。

系统能力： SystemCapability.Utils.Lang

参数：

示例：

const MY_MAX = 2048;
let arrayBuffer = new ArrayBuffer(MY_MAX);
let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.addEmptyElement("d");
let result = '<d/>';
let view = new Uint8Array(arrayBuffer);
let view1 = "";
for (let i = 0; i < result.length; ++i) {
    view1 = view1 + String.fromCodePoint(view[i]);
}
console.log(view1) // <d/>

setDeclaration

setDeclaration(): void

编写带有编码的文件声明。

系统能力： SystemCapability.Utils.Lang

示例：

const MY_MAX = 2048;
let arrayBuffer = new ArrayBuffer(MY_MAX);
let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.setDeclaration();
thatSer.setNamespace("h", "http://www.w3.org/TR/html4/");
thatSer.startElement("note");
thatSer.endElement();
let result = '<?xml version="1.0" encoding="utf-8"?>\r\n<h:note xmlns:h="http://www.w3.org/TR/html4/"/>';
let view = new Uint8Array(arrayBuffer);
let view1 = "";
for (let i = 0; i < result.length; ++i) {
    view1 = view1 + String.fromCodePoint(view[i]);
}
console.log(view1)
// <?xml version="1.0" encoding="utf-8"?>
// <h:note xmlns:h="http://www.w3.org/TR/html4/"/>

startElement

startElement(name: string): void

根据给定名称写入元素开始标记。

系统能力： SystemCapability.Utils.Lang

参数：

示例：

const MY_MAX = 2048;
let arrayBuffer = new ArrayBuffer(MY_MAX);
let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.setDeclaration();
thatSer.setNamespace("h", "http://www.w3.org/TR/html4/");
thatSer.startElement("note");
thatSer.endElement();
let result = '<?xml version="1.0" encoding="utf-8"?>\r\n<h:note xmlns:h="http://www.w3.org/TR/html4/"/>';
let view = new Uint8Array(arrayBuffer);
let view1 = "";
for (let i = 0; i < result.length; ++i) {
    view1 = view1 + String.fromCodePoint(view[i]);
}
console.log(JSON.stringify(view1)) // <?xml version="1.0" encoding="utf-8"?>\r\n<h:note xmlns:h="http://www.w3.org/TR/html4/"/>

endElement

endElement(): void

写入元素结束标记。

系统能力： SystemCapability.Utils.Lang

示例：

const MY_MAX = 2048;
let arrayBuffer = new ArrayBuffer(MY_MAX);
let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.setDeclaration();
thatSer.setNamespace("h", "http://www.w3.org/TR/html4/");
thatSer.startElement("note");
thatSer.endElement();
let result = '<?xml version="1.0" encoding="utf-8"?>\r\n<h:note xmlns:h="http://www.w3.org/TR/html4/"/>';
let view = new Uint8Array(arrayBuffer);
let view1 = "";
for (let i = 0; i < result.length; ++i) {
    view1 = view1 + String.fromCodePoint(view[i]);
}
console.log(JSON.stringify(view1)) // <?xml version="1.0" encoding="utf-8"?>\r\n<h:note xmlns:h="http://www.w3.org/TR/html4/"/>

setNamespace

setNamespace(prefix: string, namespace: string): void

写入当前元素标记的命名空间。

系统能力： SystemCapability.Utils.Lang

参数：

示例：

const MY_MAX = 2048;
let arrayBuffer = new ArrayBuffer(MY_MAX);
let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.setDeclaration();
thatSer.setNamespace("h", "http://www.w3.org/TR/html4/");
thatSer.startElement("note");
thatSer.endElement();
let result = '<?xml version="1.0" encoding="utf-8"?>\r\n<h:note xmlns:h="http://www.w3.org/TR/html4/"/>';
let view = new Uint8Array(arrayBuffer);
let view1 = "";
for (let i = 0; i < result.length; ++i) {
    view1 = view1 + String.fromCodePoint(view[i]);
}
console.log(JSON.stringify(view1)) // <?xml version="1.0" encoding="utf-8"?>\r\n<h:note xmlns:h="http://www.w3.org/TR/html4/"/>

setComment

setComment(text: string): void

写入注释内容。

系统能力： SystemCapability.Utils.Lang

参数：

示例：

const MY_MAX = 2048;
let arrayBuffer = new ArrayBuffer(MY_MAX);
let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.setComment("Hello, World!");
let result = '<!--Hello, World!-->';
let view = new Uint8Array(arrayBuffer);
let view1 = "";
for (let i = 0; i < result.length; ++i) {
    view1 = view1 + String.fromCodePoint(view[i]);
}
console.log(view1) // <!--Hello, World!-->

setCDATA

setCDATA(text: string): void

写入CDATA数据。

系统能力： SystemCapability.Utils.Lang

参数：

示例：

const MY_MAX = 2048;
let arrayBuffer = new ArrayBuffer(MY_MAX);
let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.setCDATA('root SYSTEM')
let result = '<![CDATA[root SYSTEM]]>';
let view = new Uint8Array(arrayBuffer);
let view1 = "";
for (let i = 0; i < result.length; ++i) {
    view1 = view1 + String.fromCodePoint(view[i]);
}
console.log(view1) // <![CDATA[root SYSTEM]]>

setText

setText(text: string): void

写入标签值。

系统能力： SystemCapability.Utils.Lang

参数：

示例：

const MY_MAX = 2048;
let arrayBuffer = new ArrayBuffer(MY_MAX);
let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.startElement("note");
thatSer.setAttributes("importance", "high");
thatSer.setText("Happy1");
thatSer.endElement();
let result = '<note importance="high">Happy1</note>';
let view = new Uint8Array(arrayBuffer);
let view1 = "";
for (let i = 0; i < result.length; ++i) {
    view1 = view1 + String.fromCodePoint(view[i]);
}
console.log(view1) // <note importance="high">Happy1</note>

setDocType

setDocType(text: string): void

写入文档类型。

系统能力： SystemCapability.Utils.Lang

参数：

示例：

const MY_MAX = 2048;
let arrayBuffer = new ArrayBuffer(MY_MAX);
let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.setDocType('root SYSTEM "http://www.test.org/test.dtd"');
let result = '<!DOCTYPE root SYSTEM "http://www.test.org/test.dtd">';
let view = new Uint8Array(arrayBuffer);
let view1 = "";
for (let i = 0; i < result.length; ++i) {
    view1 = view1 + String.fromCodePoint(view[i]);
}
console.log(view1) // <!DOCTYPE root SYSTEM "http://www.test.org/test.dtd">

XmlPullParser

XmlPullParser接口用于解析现有的XML文件。

constructor

constructor(buffer: ArrayBuffer | DataView, encoding?: string)

构造并返回一个XmlPullParser对象。

系统能力： SystemCapability.Utils.Lang

参数：

示例：

import util from '@ohos.util';

let strXml =
  '<?xml version="1.0" encoding="utf-8"?>' +
    '<!DOCTYPE note [\n<!ENTITY foo "baa">]>' +
    '<note importance="high" logged="true">' +
    '    <![CDATA[\r\nfuncrion matchwo(a,6)\r\n{\r\nreturn 1;\r\n}\r\n]]>' +
    '    <!--Hello, World!-->' +
    '    <company>John &amp; Hans</company>' +
    '    <title>Happy</title>' +
    '    <title>Happy</title>' +
    '    <lens>Work</lens>' +
    '    <lens>Play</lens>' +
    '    <?go there?>' +
    '    <a><b/></a>' +
    '    <h:table xmlns:h="http://www.w3.org/TR/html4/">' +
    '        <h:tr>' +
    '            <h:td>Apples</h:td>' +
    '            <h:td>Bananas</h:td>' +
    '        </h:tr>' +
    '    </h:table>' +
    '</note>';
let textEncoder = new util.TextEncoder();
let arrbuffer = textEncoder.encodeInto(strXml);
let that = new xml.XmlPullParser(arrbuffer.buffer, 'UTF-8');
let str1 = '';
function func1(name: string, value: string) {
  str1 += name + value;
  return true;
}
let options: xml.ParseOptions = {supportDoctype:true, ignoreNameSpace:true, tagValueCallbackFunction:func1}
that.parse(options);
console.log(str1)
//   note [<!ENTITY foo "baa">]note    funcrion matchwo(a,6){return 1;}    Hello, World!    companyJohn amp;amp; Hanscompany    titleHappytitle    titleHappytitle    lensWorklens    lensPlaylens    go there    abba    h:table        h:tr            h:tdApplesh:td            h:tdBananash:td        h:tr    h:tablenote

parse

parse(option: ParseOptions): void

该接口用于解析xml。

系统能力： SystemCapability.Utils.Lang

参数：

示例：

import util from '@ohos.util';

let strXml =
  '<?xml version="1.0" encoding="utf-8"?>' +
    '<note importance="high" logged="true">' +
    '    <title>Happy</title>' +
    '    <todo>Work</todo>' +
    '    <todo>Play</todo>' +
    '</note>';
let textEncoder = new util.TextEncoder();
let arrbuffer = textEncoder.encodeInto(strXml);
let that = new xml.XmlPullParser(arrbuffer.buffer);
let str = "";
function func(key: xml.EventType, value: xml.ParseInfo) {
  str += 'key:' + key + ' value:' + value.getDepth() + ' ';
  return true; // Determines whether to continually parse, which is used to continue or terminate parsing.
}
let options: xml.ParseOptions = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);
console.log(str);
// 输出:
// key:0 value:0 key:2 value:1 key:10 value:1 key:2 value:2 key:4 value:2 key:3 value:2 key:10 value:1 key:2 value:2 key:4 value:2 key:3 value:2 key:10 value:1 key:2 value:2 key:4 value:2 key:3 value:2 key:3 value:1 key:1 value:0
// 解析:
// key代表了当前事件类型，value为当前解析的深度。你可以根据EVENTTYPE来知道具体的解析事件。例如本示例结果key: value代表含义为:
// 0(START_DOCUMENT):0(起始深度为0), 2(START_TAG):1(解析到开始标签node, 对应深度为1), 10(WHITESPACE):1(解析到空白标签空格, 对应深度为1), 2(START_TAG):2(解析到开始标签title, 对应深度为2), ...

ParseOptions

xml解析选项。

系统能力： 以下各项对应的系统能力均为SystemCapability.Utils.Lang

ParseInfo

当前xml解析信息。

getColumnNumber

getColumnNumber(): number

获取当前列号，从1开始。

系统能力： SystemCapability.Utils.Lang

返回值：

示例：

import util from '@ohos.util';

let strXml =
  '<?xml version="1.0" encoding="utf-8"?>' +
    '<note importance="high" logged="true">' +
    '    <title>Happy</title>' +
    '    <todo>Work</todo>' +
    '    <todo>Play</todo>' +
    '</note>';
let textEncoder = new util.TextEncoder();
let arrbuffer = textEncoder.encodeInto(strXml);
let that = new xml.XmlPullParser(arrbuffer.buffer);
let str = "";
function func(key: xml.EventType, value: xml.ParseInfo) {
  str += 'key:' + key + ' value:' + value.getColumnNumber() + ' ';
  return true; // Determines whether to continually parse, which is used to continue or terminate parsing.
}
let options: xml.ParseOptions = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);
console.log(str);
// 输出:
// key:0 value:1 key:2 value:77 key:10 value:81 key:2 value:88 key:4 value:93 key:3 value:101 key:10 value:105 key:2 value:111 key:4 value:115 key:3 value:122 key:10 value:126 key:2 value:132 key:4 value:136 key:3 value:143 key:3 value:150 key:1 value:299

getDepth

getDepth(): number

获取元素的当前深度。

系统能力： SystemCapability.Utils.Lang

返回值：

示例：

import util from '@ohos.util';

let strXml =
  '<?xml version="1.0" encoding="utf-8"?>' +
    '<note importance="high" logged="true">' +
    '    <title>Happy</title>' +
    '    <todo>Work</todo>' +
    '    <todo>Play</todo>' +
    '</note>';
let textEncoder = new util.TextEncoder();
let arrbuffer = textEncoder.encodeInto(strXml);
let that = new xml.XmlPullParser(arrbuffer.buffer);
let str = "";
function func(key: xml.EventType, value: xml.ParseInfo) {
  str += 'key:' + key + ' value:' + value.getDepth() + ' ';
  return true; // Determines whether to continually parse, which is used to continue or terminate parsing.
}
let options: xml.ParseOptions = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);
console.log(str);
// 输出:
// key:0 value:0 key:2 value:1 key:10 value:1 key:2 value:2 key:4 value:2 key:3 value:2 key:10 value:1 key:2 value:2 key:4 value:2 key:3 value:2 key:10 value:1 key:2 value:2 key:4 value:2 key:3 value:2 key:3 value:1 key:1 value:0
// 解析:
// key代表了当前事件类型，value为当前解析的深度。你可以根据EVENTTYPE来知道具体的解析事件。例如本示例结果key: value代表含义为:
// 0(START_DOCUMENT):0(起始深度为0), 2(START_TAG):1(解析到开始标签node, 对应深度为1), 10(WHITESPACE):1(解析到空白标签空格, 对应深度为1), 2(START_TAG):2(解析到开始标签title, 对应深度为2), ...

getLineNumber

getLineNumber(): number

获取当前行号，从1开始。

系统能力： SystemCapability.Utils.Lang

返回值：

示例：

import util from '@ohos.util';

let strXml =
  '<?xml version="1.0" encoding="utf-8"?>' +
    '<note importance="high" logged="true">' +
    '    <title>Happy</title>' +
    '    <todo>Work</todo>' +
    '    <todo>Play</todo>' +
    '</note>';
let textEncoder = new util.TextEncoder();
let arrbuffer = textEncoder.encodeInto(strXml);
let that = new xml.XmlPullParser(arrbuffer.buffer);
let str = "";
function func(key: xml.EventType, value: xml.ParseInfo) {
  str += 'key:' + key + ' value:' + value.getLineNumber() + ' ';
  return true; // Determines whether to continually parse, which is used to continue or terminate parsing.
}
let options: xml.ParseOptions = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);
console.log(str);
// 输出:
// key:0 value:1 key:2 value:1 key:10 value:1 key:2 value:1 key:4 value:1 key:3 value:1 key:10 value:1 key:2 value:1 key:4 value:1 key:3 value:1 key:10 value:1 key:2 value:1 key:4 value:1 key:3 value:1 key:3 value:1 key:1 value:1

getName

getName(): string

获取当前元素名称。

系统能力： SystemCapability.Utils.Lang

返回值：

示例：

import util from '@ohos.util';

let strXml =
  '<?xml version="1.0" encoding="utf-8"?>' +
    '<note importance="high" logged="true">' +
    '    <title>Happy</title>' +
    '    <todo>Work</todo>' +
    '    <todo>Play</todo>' +
    '</note>';
let textEncoder = new util.TextEncoder();
let arrbuffer = textEncoder.encodeInto(strXml);
let that = new xml.XmlPullParser(arrbuffer.buffer);
let str = "";
function func(key: xml.EventType, value: xml.ParseInfo) {
  str += 'key:' + key + ' value:' + value.getName() + ' ';
  return true; // Determines whether to continually parse, which is used to continue or terminate parsing.
}
let options: xml.ParseOptions = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);
console.log(str);
// 输出:
// key:0 value: key:2 value:note key:10 value: key:2 value:title key:4 value: key:3 value:title key:10 value: key:2 value:todo key:4 value: key:3 value:todo key:10 value: key:2 value:todo key:4 value: key:3 value:todo key:3 value:note key:1 value:

getNamespace

getNamespace(): string

获取当前元素的命名空间。

系统能力： SystemCapability.Utils.Lang

返回值：

示例：

import util from '@ohos.util';

let strXml =
  '<?xml version="1.0" encoding="utf-8"?>' +
    '<note importance="high" logged="true">' +
    '    <title>Happy</title>' +
    '    <todo>Work</todo>' +
    '    <todo>Play</todo>' +
    '</note>';
let textEncoder = new util.TextEncoder();
let arrbuffer = textEncoder.encodeInto(strXml);
let that = new xml.XmlPullParser(arrbuffer.buffer);
let str = "";
function func(key: xml.EventType, value: xml.ParseInfo) {
  str += 'key:' + key + ' value:' + value.getNamespace() + ' ';
  return true; // Determines whether to continually parse, which is used to continue or terminate parsing.
}
let options: xml.ParseOptions = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);
console.log(str);
// 输出:
// key:0 value: key:2 value: key:10 value: key:2 value: key:4 value: key:3 value: key:10 value: key:2 value: key:4 value: key:3 value: key:10 value: key:2 value: key:4 value: key:3 value: key:3 value: key:1 value:

getPrefix

getPrefix(): string

获取当前元素前缀。

系统能力： SystemCapability.Utils.Lang

返回值：

示例：

import util from '@ohos.util';

let strXml =
  '<?xml version="1.0" encoding="utf-8"?>' +
    '<note importance="high" logged="true">' +
    '    <title>Happy</title>' +
    '    <todo>Work</todo>' +
    '    <todo>Play</todo>' +
    '</note>';
let textEncoder = new util.TextEncoder();
let arrbuffer = textEncoder.encodeInto(strXml);
let that = new xml.XmlPullParser(arrbuffer.buffer);
let str = "";
function func(key: xml.EventType, value: xml.ParseInfo) {
  str += 'key:' + key + ' value:' + value.getPrefix() + ' ';
  return true; // Determines whether to continually parse, which is used to continue or terminate parsing.
}
let options: xml.ParseOptions = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);
console.log(str);
// 输出:
// key:0 value: key:2 value: key:10 value: key:2 value: key:4 value: key:3 value: key:10 value: key:2 value: key:4 value: key:3 value: key:10 value: key:2 value: key:4 value: key:3 value: key:3 value: key:1 value:

getText

getText(): string

获取当前事件的文本内容。

系统能力： SystemCapability.Utils.Lang

返回值：

示例：

import util from '@ohos.util';

let strXml =
  '<?xml version="1.0" encoding="utf-8"?>' +
    '<note importance="high" logged="true">' +
    '    <title>Happy</title>' +
    '    <todo>Work</todo>' +
    '    <todo>Play</todo>' +
    '</note>';
let textEncoder = new util.TextEncoder();
let arrbuffer = textEncoder.encodeInto(strXml);
let that = new xml.XmlPullParser(arrbuffer.buffer);
let str = "";
function func(key: xml.EventType, value: xml.ParseInfo) {
  str += ' key:' + key + ' value:' + value.getText() + ' ';
  return true; // Determines whether to continually parse, which is used to continue or terminate parsing.
}
let options: xml.ParseOptions = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);
console.log(str);
// 输出:
// key:0 value:  key:2 value:  key:10 value:      key:2 value:  key:4 value:Happy  key:3 value:  key:10 value:      key:2 value:  key:4 value:Work  key:3 value:  key:10 value:      key:2 value:  key:4 value:Play  key:3 value:  key:3 value:  key:1 value:

isEmptyElementTag

isEmptyElementTag(): boolean

判断当前元素是否为空元素。

系统能力： SystemCapability.Utils.Lang

返回值：

示例：

import util from '@ohos.util';

let strXml =
  '<?xml version="1.0" encoding="utf-8"?>' +
    '<note importance="high" logged="true">' +
    '    <title>Happy</title>' +
    '    <todo>Work</todo>' +
    '    <todo>Play</todo>' +
    '</note>';
let textEncoder = new util.TextEncoder();
let arrbuffer = textEncoder.encodeInto(strXml);
let that = new xml.XmlPullParser(arrbuffer.buffer);
let str = "";
function func(key: xml.EventType, value: xml.ParseInfo) {
  str += 'key:' + key + ' value:' + value.isEmptyElementTag() + ' ';
  return true; // Determines whether to continually parse, which is used to continue or terminate parsing.
}
let options: xml.ParseOptions = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);
console.log(str);
// 输出:
// key:0 value:false key:2 value:false key:10 value:false key:2 value:false key:4 value:false key:3 value:false key:10 value:false key:2 value:false key:4 value:false key:3 value:false key:10 value:false key:2 value:false key:4 value:false key:3 value:false key:3 value:false key:1 value:false

isWhitespace

isWhitespace(): boolean

判断当前文本事件是否仅包含空格字符。

系统能力： SystemCapability.Utils.Lang

返回值：

示例：

import util from '@ohos.util';

let strXml =
  '<?xml version="1.0" encoding="utf-8"?>' +
    '<note importance="high" logged="true">' +
    '    <title>Happy</title>' +
    '    <todo>Work</todo>' +
    '    <todo>Play</todo>' +
    '</note>';
let textEncoder = new util.TextEncoder();
let arrbuffer = textEncoder.encodeInto(strXml);
let that = new xml.XmlPullParser(arrbuffer.buffer);
let str = "";
function func(key: xml.EventType, value: xml.ParseInfo) {
  str += 'key:' + key + ' value:' + value.isWhitespace() + ' ';
  return true; // Determines whether to continually parse, which is used to continue or terminate parsing.
}
let options: xml.ParseOptions = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);
console.log(str);
// 输出:
// key:0 value:true key:2 value:false key:10 value:true key:2 value:true key:4 value:false key:3 value:true key:10 value:true key:2 value:true key:4 value:false key:3 value:true key:10 value:true key:2 value:true key:4 value:false key:3 value:true key:3 value:true key:1 value:true

getAttributeCount

getAttributeCount(): number

获取当前开始标记的属性数。

系统能力： SystemCapability.Utils.Lang

返回值：

示例：

import util from '@ohos.util';

let strXml =
  '<?xml version="1.0" encoding="utf-8"?>' +
    '<note importance="high" logged="true">' +
    '    <title>Happy</title>' +
    '    <todo>Work</todo>' +
    '    <todo>Play</todo>' +
    '</note>';
let textEncoder = new util.TextEncoder();
let arrbuffer = textEncoder.encodeInto(strXml);
let that = new xml.XmlPullParser(arrbuffer.buffer);
let str = "";
function func(key: xml.EventType, value: xml.ParseInfo) {
  str += 'key:' + key + ' value:' + value.getAttributeCount() + ' ';
  return true; // Determines whether to continually parse, which is used to continue or terminate parsing.
}
let options: xml.ParseOptions = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);
console.log(str);
// 输出:
// key:0 value:0 key:2 value:2 key:10 value:0 key:2 value:0 key:4 value:0 key:3 value:0 key:10 value:0 key:2 value:0 key:4 value:0 key:3 value:0 key:10 value:0 key:2 value:0 key:4 value:0 key:3 value:0 key:3 value:0 key:1 value:0

EventType

事件类型枚举。

系统能力： 以下各项对应的系统能力均为SystemCapability.Utils.Lang