Fix bug convertxml cannot work

issue:https://gitee.com/openharmony/js_api_module/issues/I51SDASigned-off-by: Nlihucheng <lihucheng1@huawei.com>

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

@@ -35,21 +35,26 @@ Converts an XML text into a JavaScript object.
 
   | Type| Description|
   | ------ | ---------------------------- |
-  | string | JavaScript object.|
+  | Object | JavaScript object.|
 
 - Example
 
   ```
-  var xml =
+  let xml =
       '<?xml version="1.0" encoding="utf-8"?>' +
       '<note importance="high" logged="true">' +
       '    <title>Happy</title>' +
       '    <todo>Work</todo>' +
       '    <todo>Play</todo>' +
       '</note>';
-  var conv = new convertxml.ConvertXML();
-  var result1 = conv.convert(xml, {trim: false, ignoreDeclaration: false});
-  console.log(result1)
+  let conv = new convertxml.ConvertXML();
+  let options = {trim : false, declarationKey:"_declaration",
+                 instructionKey : "_instruction", attributesKey : "_attributes",
+                 textKey : "_text", cdataKey:"_cdata", doctypeKey : "_doctype",
+                 commentKey : "_comment", parentKey : "_parent", typeKey : "_type",
+                 nameKey : "_name", elementsKey : "_elements"}
+  let result = JSON.stringify(conv.convert(xml, options));
+  console.log(result)
   ```
 
 
@@ -57,7 +62,7 @@ Converts an XML text into a JavaScript object.
 
 | Name| Type| Mandatory| Description|
 | ----------------- | -------- | ---- | ----------------------------------------------------------- |
-| trim              | boolean  | No| Whether to trim the whitespace characters before and after the text. The default value is **false**.|
+| trim              | boolean  | Yes| Whether to trim the whitespace characters before and after the text. The default value is **false**.|
 | ignoreDeclaration | boolean  | No| Whether to ignore the XML declaration. The default value is **false**.|
 | ignoreInstruction | boolean  | No| Whether to ignore the XML processing instruction. The default value is **false**.|
 | ignoreAttributes  | boolean  | No| Whether to print attributes across multiple lines and indent attributes. The default value is **false**.|
@@ -65,14 +70,14 @@ Converts an XML text into a JavaScript object.
 | ignoreCDATA       | boolean  | No| Whether to ignore the element's CDATA information. The default value is **false**.|
 | ignoreDoctype     | boolean  | No| Whether to ignore the element's Doctype information. The default value is **false**.|
 | ignoreText        | boolean  | No| Whether to ignore the element's text information. The default value is **false**.|
-| declarationKey    | string   | No| Name of the attribute key for **declaration** in the output object. The default value is **_declaration**.|
-| instructionKey    | string   | No| Name of the attribute key for **instruction** in the output object. The default value is **_instruction**.|
-| attributesKey     | string   | No| Name of the attribute key for **attributes** in the output object. The default value is **_attributes**.|
-| textKey           | string   | No| Name of the attribute key for **text** in the output object. The default value is **_text**.|
-| cdataKey          | string   | No| Name of the attribute key for **CDATA** in the output object. The default value is **_cdata**.|
-| doctypeKey        | string   | No| Name of the attribute key for **Doctype** in the output object. The default value is **_doctype**.|
-| commentKey        | string   | No| Name of the attribute key for **comment** in the output object. The default value is **_comment**.|
-| parentKey         | string   | No| Name of the attribute key for **parent** in the output object. The default value is **_parent**.|
-| typeKey           | string   | No| Name of the attribute key for **type** in the output object. The default value is **_type**.|
-| nameKey           | string   | No| Name of the attribute key for **name** in the output object. The default value is **_name**.|
-| elementsKey       | string   | No| Name of the attribute key for **elements** in the output object. The default value is **_elements**.|
+| declarationKey    | string   | Yes| Name of the attribute key for **declaration** in the output object. The default value is **_declaration**.|
+| instructionKey    | string   | Yes| Name of the attribute key for **instruction** in the output object. The default value is **_instruction**.|
+| attributesKey     | string   | Yes| Name of the attribute key for **attributes** in the output object. The default value is **_attributes**.|
+| textKey           | string   | Yes| Name of the attribute key for **text** in the output object. The default value is **_text**.|
+| cdataKey          | string   | Yes| Name of the attribute key for **CDATA** in the output object. The default value is **_cdata**.|
+| doctypeKey        | string   | Yes| Name of the attribute key for **Doctype** in the output object. The default value is **_doctype**.|
+| commentKey        | string   | Yes| Name of the attribute key for **comment** in the output object. The default value is **_comment**.|
+| parentKey         | string   | Yes| Name of the attribute key for **parent** in the output object. The default value is **_parent**.|
+| typeKey           | string   | Yes| Name of the attribute key for **type** in the output object. The default value is **_type**.|
+| nameKey           | string   | Yes| Name of the attribute key for **name** in the output object. The default value is **_name**.|
+| elementsKey       | string   | Yes| Name of the attribute key for **elements** in the output object. The default value is **_elements**.|

zh-cn/application-dev/reference/apis/js-apis-convertxml.md

@@ -35,21 +35,26 @@ convert(xml: string, options?: ConvertOptions) : Object
 
   | 类型   | 说明                         |
   | ------ | ---------------------------- |
-  | string | 处理后返回的JavaScript对象。 |
+  | Object | 处理后返回的JavaScript对象。 |
 
 - 示例：
 
   ```
-  var xml =
+  let xml =
       '<?xml version="1.0" encoding="utf-8"?>' +
       '<note importance="high" logged="true">' +
       '    <title>Happy</title>' +
       '    <todo>Work</todo>' +
       '    <todo>Play</todo>' +
       '</note>';
-  var conv = new convertxml.ConvertXML();
-  var result1 = conv.convert(xml, {trim: false, ignoreDeclaration: false});
-  console.log(result1)
+  let conv = new convertxml.ConvertXML();
+  let options = {trim : false, declarationKey:"_declaration",
+                 instructionKey : "_instruction", attributesKey : "_attributes",
+                 textKey : "_text", cdataKey:"_cdata", doctypeKey : "_doctype",
+                 commentKey : "_comment", parentKey : "_parent", typeKey : "_type",
+                 nameKey : "_name", elementsKey : "_elements"}
+  let result = JSON.stringify(conv.convert(xml, options));
+  console.log(result)
   ```
 
 
@@ -57,7 +62,7 @@ convert(xml: string, options?: ConvertOptions) : Object
 
 | 名称              | 参数类型 | 必填 | 说明                                                        |
 | ----------------- | -------- | ---- | ----------------------------------------------------------- |
-| trim              | boolean  | 否   | 是否修剪位于文本前后的空白字符，默认false。                 |
+| trim              | boolean  | 是   | 是否修剪位于文本前后的空白字符，默认false。                 |
 | ignoreDeclaration | boolean  | 否   | 是否忽略xml写入声明指示，默认false。                        |
 | ignoreInstruction | boolean  | 否   | 是否忽略xml的写入处理指令，默认false。                      |
 | ignoreAttributes  | boolean  | 否   | 是否跨多行打印属性并缩进属性，默认false。                   |
@@ -65,14 +70,14 @@ convert(xml: string, options?: ConvertOptions) : Object
 | ignoreCDATA       | boolean  | 否   | 是否忽略元素的CDATA信息，默认false。                        |
 | ignoreDoctype     | boolean  | 否   | 是否忽略元素的Doctype信息，默认false。                      |
 | ignoreText        | boolean  | 否   | 是否忽略元素的文本信息，默认false。                         |
-| declarationKey    | string   | 否   | 用于输出对象中declaration的属性键的名称，默认_declaration。 |
-| instructionKey    | string   | 否   | 用于输出对象中instruction的属性键的名称，默认_instruction。 |
-| attributesKey     | string   | 否   | 用于输出对象中attributes的属性键的名称，默认_attributes。   |
-| textKey           | string   | 否   | 用于输出对象中text的属性键的名称，默认_text。               |
-| cdataKey          | string   | 否   | 用于输出对象中cdata的属性键的名称，默认_cdata。             |
-| doctypeKey        | string   | 否   | 用于输出对象中doctype的属性键的名称，默认_doctype。         |
-| commentKey        | string   | 否   | 用于输出对象中comment的属性键的名称，默认_comment。         |
-| parentKey         | string   | 否   | 用于输出对象中parent的属性键的名称，默认_parent。           |
-| typeKey           | string   | 否   | 用于输出对象中type的属性键的名称，默认_type。               |
-| nameKey           | string   | 否   | 用于输出对象中name的属性键的名称，默认_name。               |
-| elementsKey       | string   | 否   | 用于输出对象中elements的属性键的名称，默认_elements。       |
+| declarationKey    | string   | 是   | 用于输出对象中declaration的属性键的名称，默认_declaration。 |
+| instructionKey    | string   | 是   | 用于输出对象中instruction的属性键的名称，默认_instruction。 |
+| attributesKey     | string   | 是   | 用于输出对象中attributes的属性键的名称，默认_attributes。   |
+| textKey           | string   | 是   | 用于输出对象中text的属性键的名称，默认_text。               |
+| cdataKey          | string   | 是   | 用于输出对象中cdata的属性键的名称，默认_cdata。             |
+| doctypeKey        | string   | 是   | 用于输出对象中doctype的属性键的名称，默认_doctype。         |
+| commentKey        | string   | 是   | 用于输出对象中comment的属性键的名称，默认_comment。         |
+| parentKey         | string   | 是   | 用于输出对象中parent的属性键的名称，默认_parent。           |
+| typeKey           | string   | 是   | 用于输出对象中type的属性键的名称，默认_type。               |
+| nameKey           | string   | 是   | 用于输出对象中name的属性键的名称，默认_name。               |
+| elementsKey       | string   | 是   | 用于输出对象中elements的属性键的名称，默认_elements。       |
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