update zh-cn/application-dev/faqs/faqs-ui-js.md.

Signed-off-by: Nzengyawen <zengyawen1@huawei.com>

zh-cn/application-dev/faqs/faqs-ui-js.md

@@ -13,25 +13,33 @@ convertxml中convert方法提供了转换xml文本为JavaScript对象的能力
   
 ```
 import convertxml from '@ohos.convertxml';
-// 代码片段
-xml =
+// xml格式的字符串
+let xml =
   '<?xml version="1.0" encoding="utf-8"?>' +
   '<note importance="high" logged="true">' +
   '    <title>Happy</title>' +
   '    <todo>Work</todo>' +
   '    <todo>Play</todo>' +
   '</note>';
-let conv = new convertxml.ConvertXML(); 
+let conv = new convertxml.ConvertXML();
 // 转换选项, 参考文档使用
-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:any = conv.convert(xml, options) // 将xml文本转为JS对象
+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: any = conv.convert(xml, options) // 将xml文本转为JS对象
 console.log('Test: ' + JSON.stringify(result))
-console.log('Test: ' + result._declaration._attributes.version) // xml代码片段version字段信息
-console.log('Test: ' + result._elements[0]._elements[0]._elements[0]._text) // xml代码片段title字段内容
+console.log('Test: ' + result._declaration._attributes.version) // xml字符串中version字段信息console.log('Test: ' + result._elements[0]._elements[0]._elements[0]._text) // xml字符串中title字段内容
 ```
 
 参考文档：[xml转换JavaScript](https://gitee.com/openharmony/docs/blob/master/zh-cn/application-dev/reference/apis/js-apis-convertxml.md)