Modify the var in the util, uri, url, xml, process module use cases in the docs document to let

Signed-off-by: Nbi-hu <bihu@huawei.com>
https://gitee.com/openharmony/docs/issues/I5RSP6

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

@@ -63,8 +63,8 @@ wait(): Promise<number>
 **示例：**
 
 ```js
-var child = process.runCmd('ls');
-var result = child.wait();
+let child = process.runCmd('ls');
+let result = child.wait();
 result.then(val=>{
     console.log("result = " + val);
 })
@@ -90,8 +90,8 @@ getOutput(): Promise<Uint8Array>
 **示例：**
 
 ```js
-var child = process.runCmd('ls');
-var result = child.wait();
+let child = process.runCmd('ls');
+let result = child.wait();
 child.getOutput().then(val=>{
     console.log("child.getOutput = " + val);
 })
@@ -117,8 +117,8 @@ getErrorOutput(): Promise<Uint8Array>
 **示例：**
 
 ```js
-var child = process.runCmd('madir test.text');
-var result = child.wait();
+let child = process.runCmd('madir test.text');
+let result = child.wait();
 child.getErrorOutput().then(val=>{
     console.log("child.getErrorOutput= " + val);
 })
@@ -138,7 +138,7 @@ close(): void
 **示例：**
 
 ```js
-var child = process.runCmd('sleep 5; ls');
+let child = process.runCmd('sleep 5; ls');
 child.close();
 ```
 
@@ -162,7 +162,7 @@ kill(signal: number | string): void
 **示例：**
 
 ```js
-var child = process.runCmd('sleep 5; ls');
+let child = process.runCmd('sleep 5; ls');
 child.kill(9);
 ```
 
@@ -184,7 +184,7 @@ isIsolatedProcess(): boolean
 **示例：**
 
 ```js
-var result = process.isIsolatedProcess();
+let result = process.isIsolatedProcess();
 ```
 
 
@@ -211,7 +211,7 @@ isAppUid(v: number): boolean
 **示例：**
 
 ```js
-var result = process.isAppUid(688);
+let result = process.isAppUid(688);
 ```
 
 
@@ -232,7 +232,7 @@ is64Bit(): boolean
 **示例：**
 
 ```js
-var result = process.is64Bit();
+let result = process.is64Bit();
 ```
 
 
@@ -259,7 +259,7 @@ getUidForName(v: string): number
 **示例：**
 
 ```js
-var pres = process.getUidForName("tool")
+let pres = process.getUidForName("tool")
 ```
 
 
@@ -286,8 +286,8 @@ getThreadPriority(v: number): number
 **示例：**
 
 ```js
-var tid = process.tid;
-var pres = process.getThreadPriority(tid);
+let tid = process.tid;
+let pres = process.getThreadPriority(tid);
 ```
 
 
@@ -308,7 +308,7 @@ getStartRealtime(): number
 **示例：**
 
 ```js
-var realtime = process.getStartRealtime();
+let realtime = process.getStartRealtime();
 ```
 
 ## process.getPastCpuTime<sup>8+</sup>
@@ -328,7 +328,7 @@ getPastCpuTime(): number
 **示例：**
 
 ```js
-var result = process.getPastCpuTime() ;
+let result = process.getPastCpuTime() ;
 ```
 
 
@@ -355,8 +355,8 @@ getSystemConfig(name: number): number
 **示例：**
 
 ```js
-var _SC_ARG_MAX = 0
-var pres = process.getSystemConfig(_SC_ARG_MAX)
+let _SC_ARG_MAX = 0
+let pres = process.getSystemConfig(_SC_ARG_MAX)
 ```
 
 
@@ -383,7 +383,7 @@ getEnvironmentVar(name: string): string
 **示例：**
 
 ```js
-var pres = process.getEnvironmentVar("PATH")
+let pres = process.getEnvironmentVar("PATH")
 ```
 
 
@@ -421,8 +421,8 @@ runCmd(command: string, options?: { timeout?: number, killSignal?: number | stri
 **示例：**
 
 ```js
-var child = process.runCmd('ls', { maxBuffer : 2 });
-var result = child.wait();
+let child = process.runCmd('ls', { maxBuffer : 2 });
+let result = child.wait();
 child.getOutput.then(val=>{
     console.log("child.getOutput = " + val);
 })
@@ -504,7 +504,7 @@ off(type: string): boolean
 process.on("data", (e)=>{
     console.log("data callback");
 })
-var result = process.off("data");
+let result = process.off("data");
 ```
 
 
@@ -544,7 +544,7 @@ cwd(): string
 **示例：**
 
 ```js
-var path = process.cwd();
+let path = process.cwd();
 ```
 
 
@@ -588,7 +588,7 @@ uptime(): number
 **示例：**
 
 ```js
-var time = process.uptime();
+let time = process.uptime();
 ```
 
 
@@ -616,6 +616,6 @@ kill(signal: number, pid: number): boolean
 **示例：**
 
 ```js
-var pres = process.pid
-var result = process.kill(28, pres)
+let pres = process.pid
+let result = process.kill(28, pres)
 ```

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

@@ -46,7 +46,7 @@ constructor是URI的构造函数。
 **示例：**
 
 ```js
-var mm = 'http://username:password@host:8080/directory/file?foo=1&bar=2#fragment';
+let mm = 'http://username:password@host:8080/directory/file?foo=1&bar=2#fragment';
 new uri.URI(mm); // Output 'http://username:password@host:8080/directory/file?foo=1&bar=2#fragment';
 ```
 ```js

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

@@ -30,11 +30,11 @@ URLSearchParams的构造函数。
 **示例：**
 
 ```js
-var objectParams = new Url.URLSearchParams([ ['user1', 'abc1'], ['query2', 'first2'], ['query3', 'second3'] ]);
-var objectParams1 = new Url.URLSearchParams({"fod" : '1' , "bard" : '2'});
-var objectParams2 = new Url.URLSearchParams('?fod=1&bard=2');
-var urlObject = new Url.URL('https://developer.mozilla.org/?fod=1&bard=2');
-var params = new Url.URLSearchParams(urlObject.search);
+let objectParams = new Url.URLSearchParams([ ['user1', 'abc1'], ['query2', 'first2'], ['query3', 'second3'] ]);
+let objectParams1 = new Url.URLSearchParams({"fod" : '1' , "bard" : '2'});
+let objectParams2 = new Url.URLSearchParams('?fod=1&bard=2');
+let urlObject = new Url.URL('https://developer.mozilla.org/?fod=1&bard=2');
+let params = new Url.URLSearchParams(urlObject.search);
 ```
 
 
@@ -132,7 +132,7 @@ entries(): IterableIterator<[string, string]>
 **示例：**
 
 ```js
-var searchParamsObject = new Url.URLSearchParams("keyName1=valueName1&keyName2=valueName2"); 
+let searchParamsObject = new Url.URLSearchParams("keyName1=valueName1&keyName2=valueName2"); 
 for (var pair of searchParamsObject .entries()) { // Show keyName/valueName pairs
     console.log(pair[0]+ ', '+ pair[1]);
 }
@@ -196,9 +196,9 @@ get(name: string): string | null
 **示例：**
 
 ```js
-var paramsOject = new Url.URLSearchParams('name=Jonathan&age=18'); 
-var name = paramsOject.get("name"); // is the string "Jonathan" 
-var age = parseInt(paramsOject.get("age"), 10); // is the number 18
+let paramsOject = new Url.URLSearchParams('name=Jonathan&age=18'); 
+let name = paramsOject.get("name"); // is the string "Jonathan" 
+let age = parseInt(paramsOject.get("age"), 10); // is the number 18
 ```
 
 
@@ -266,7 +266,7 @@ sort(): void
 **示例：**
 
 ```js
-var searchParamsObject = new Url.URLSearchParams("c=3&a=9&b=4&d=2"); // Create a test URLSearchParams object
+let searchParamsObject = new Url.URLSearchParams("c=3&a=9&b=4&d=2"); // Create a test URLSearchParams object
 searchParamsObject.sort(); // Sort the key/value pairs
 console.log(searchParamsObject.toString()); // Display the sorted query string // Output a=9&b=2&c=3&d=4
 ```
@@ -289,7 +289,7 @@ keys(): IterableIterator&lt;string&gt;
 **示例：**
 
 ```js
-var searchParamsObject = new Url.URLSearchParams("key1=value1&key2=value2"); // Create a URLSearchParamsObject object for testing
+let searchParamsObject = new Url.URLSearchParams("key1=value1&key2=value2"); // Create a URLSearchParamsObject object for testing
 for (var key of searchParamsObject .keys()) { // Output key-value pairs
     console.log(key);
 }
@@ -313,8 +313,8 @@ values(): IterableIterator&lt;string&gt;
 **示例：**
 
 ```js
-var searchParams = new Url.URLSearchParams("key1=value1&key2=value2"); // Create a URLSearchParamsObject object for testing
-for (var value of searchParams.values()) { 
+let searchParams = new Url.URLSearchParams("key1=value1&key2=value2"); // Create a URLSearchParamsObject object for testing
+for (var value of searchParams.values()) {
     console.log(value);
 }
 ```
@@ -338,7 +338,7 @@ for (var value of searchParams.values()) {
 
 ```js
 const paramsObject = new Url.URLSearchParams('fod=bay&edg=bap');
-for (const [name, value] of paramsObject) { 
+for (const [name, value] of paramsObject) {
     console.log(name, value); 
 } 
 ```
@@ -408,11 +408,11 @@ URL的构造函数。
 **示例：**
 
 ```js
-var mm = 'http://username:password@host:8080';
-var a = new Url.URL("/", mm); // Output 'http://username:password@host:8080/';
-var b = new Url.URL(mm); // Output 'http://username:password@host:8080/';
+let mm = 'http://username:password@host:8080';
+let a = new Url.URL("/", mm); // Output 'http://username:password@host:8080/';
+let b = new Url.URL(mm); // Output 'http://username:password@host:8080/';
 new Url.URL('path/path1', b); // Output 'http://username:password@host:8080/path/path1';
-var c = new Url.URL('/path/path1', b);  // Output 'http://username:password@host:8080/path/path1'; 
+let c = new Url.URL('/path/path1', b);  // Output 'http://username:password@host:8080/path/path1'; 
 new Url.URL('/path/path1', c); // Output 'http://username:password@host:8080/path/path1';
 new Url.URL('/path/path1', a); // Output 'http://username:password@host:8080/path/path1';
 new Url.URL('/path/path1', "https://www.exampleUrl/fr-FR/toto"); // Output https://www.exampleUrl/path/path1

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

@@ -31,9 +31,9 @@ XmlSerializer的构造函数。
 **示例：**
 
 ```js
-var arrayBuffer = new ArrayBuffer(1024);
-var bufView = new DataView(arrayBuffer);
-var thatSer = new xml.XmlSerializer(bufView);
+let arrayBuffer = new ArrayBuffer(1024);
+let bufView = new DataView(arrayBuffer);
+let thatSer = new xml.XmlSerializer(bufView);
 ```
 
 
@@ -55,9 +55,9 @@ setAttributes(name: string, value: string): void
 **示例：**
 
 ```js
-var arrayBuffer = new ArrayBuffer(1024);
-var bufView = new DataView(arrayBuffer);
-var thatSer = new xml.XmlSerializer(bufView);
+let arrayBuffer = new ArrayBuffer(1024);
+let bufView = new DataView(arrayBuffer);
+let thatSer = new xml.XmlSerializer(bufView);
 thatSer.setAttributes("importance", "high");  
 ```
 
@@ -79,9 +79,9 @@ addEmptyElement(name: string): void
 **示例：**
 
 ```js
-var arrayBuffer = new ArrayBuffer(1024);
-var bufView = new DataView(arrayBuffer);
-var thatSer = new xml.XmlSerializer(bufView);
+let arrayBuffer = new ArrayBuffer(1024);
+let bufView = new DataView(arrayBuffer);
+let thatSer = new xml.XmlSerializer(bufView);
 thatSer.addEmptyElement("b"); // => <b/>
 ```
 
@@ -97,9 +97,9 @@ setDeclaration(): void
 **示例：**
 
 ```js
-var arrayBuffer = new ArrayBuffer(1024);
-var bufView = new DataView(arrayBuffer);
-var thatSer = new xml.XmlSerializer(bufView);
+let arrayBuffer = new ArrayBuffer(1024);
+let bufView = new DataView(arrayBuffer);
+let thatSer = new xml.XmlSerializer(bufView);
 thatSer.setDeclaration() // => <?xml version="1.0" encoding="utf-8"?>;
 ```
 
@@ -121,8 +121,8 @@ startElement(name: string): void
 **示例：**
 
 ```js
-var arrayBuffer = new ArrayBuffer(1024);
-var thatSer = new xml.XmlSerializer(arrayBuffer);
+let arrayBuffer = new ArrayBuffer(1024);
+let thatSer = new xml.XmlSerializer(arrayBuffer);
 thatSer.startElement("notel");
 thatSer.endElement();// => '<notel/>';
 ```
@@ -139,9 +139,9 @@ endElement(): void
 **示例：**
 
 ```js
-var arrayBuffer = new ArrayBuffer(1024);
-var bufView = new DataView(arrayBuffer);
-var thatSer = new xml.XmlSerializer(bufView);
+let arrayBuffer = new ArrayBuffer(1024);
+let bufView = new DataView(arrayBuffer);
+let thatSer = new xml.XmlSerializer(bufView);
 thatSer.setNamespace("h", "http://www.w3.org/TR/html4/");
 thatSer.startElement("table");
 thatSer.setAttributes("importance", "high");
@@ -168,8 +168,8 @@ setNamespace(prefix: string, namespace: string): void
 **示例：**
 
 ```js
-var arrayBuffer = new ArrayBuffer(1024);
-var thatSer = new xml.XmlSerializer(arrayBuffer);
+let arrayBuffer = new ArrayBuffer(1024);
+let thatSer = new xml.XmlSerializer(arrayBuffer);
 thatSer.setDeclaration();
 thatSer.setNamespace("h", "http://www.w3.org/TR/html4/");
 thatSer.startElement("note");
@@ -193,8 +193,8 @@ setComment(text: string): void
 **示例：**
 
 ```js
-var arrayBuffer = new ArrayBuffer(1024);
-var thatSer = new xml.XmlSerializer(arrayBuffer);
+let arrayBuffer = new ArrayBuffer(1024);
+let thatSer = new xml.XmlSerializer(arrayBuffer);
 thatSer.startElement("note");
 thatSer.setComment("Hi!");
 thatSer.endElement(); // => '<note>\r\n  <!--Hi!-->\r\n</note>';
@@ -218,8 +218,8 @@ setCDATA(text: string): void
 **示例：**
 
 ```js
-var arrayBuffer = new ArrayBuffer(1028);
-var thatSer = new xml.XmlSerializer(arrayBuffer);
+let arrayBuffer = new ArrayBuffer(1028);
+let thatSer = new xml.XmlSerializer(arrayBuffer);
 thatSer.setCDATA('root SYSTEM') // => '<![CDATA[root SYSTEM]]>';
 ```
 
@@ -241,8 +241,8 @@ setText(text: string): void
 **示例：**
 
 ```js
-var arrayBuffer = new ArrayBuffer(1024);
-var thatSer = new xml.XmlSerializer(arrayBuffer);
+let arrayBuffer = new ArrayBuffer(1024);
+let thatSer = new xml.XmlSerializer(arrayBuffer);
 thatSer.startElement("note");
 thatSer.setAttributes("importance", "high");
 thatSer.setText("Happy1");
@@ -267,8 +267,8 @@ setDocType(text: string): void
 **示例：**
 
 ```js
-var arrayBuffer = new ArrayBuffer(1024);
-var thatSer = new xml.XmlSerializer(arrayBuffer);
+let arrayBuffer = new ArrayBuffer(1024);
+let thatSer = new xml.XmlSerializer(arrayBuffer);
 thatSer.setDocType('root SYSTEM'); // => '<!DOCTYPE root SYSTEM>';
 ```
 
@@ -294,20 +294,20 @@ constructor(buffer: ArrayBuffer | DataView, encoding?: string)
 **示例：**
 
 ```js
-var strXml =
+let strXml =
             '<?xml version="1.0" encoding="utf-8"?>' +
             '<note importance="high" logged="true">' +
             '    <title>Happy</title>' +
             '    <todo>Work</todo>' +
             '    <todo>Play</todo>' +
             '</note>';
-var arrayBuffer = new ArrayBuffer(strXml.length);
-var bufView = new Uint8Array(arrayBuffer);
-var strLen = strXml.length;
+let arrayBuffer = new ArrayBuffer(strXml.length);
+let bufView = new Uint8Array(arrayBuffer);
+let strLen = strXml.length;
 for (var i = 0; i < strLen; ++i) {
     bufView[i] = strXml.charCodeAt(i);//设置arraybuffer方式
 }
-var that = new xml.XmlPullParser(arrayBuffer);
+let that = new xml.XmlPullParser(arrayBuffer);
 ```
 
 
@@ -328,30 +328,30 @@ parse(option: ParseOptions): void
 **示例：**
 
 ```js
-var strXml =
+let strXml =
             '<?xml version="1.0" encoding="utf-8"?>' +
             '<note importance="high" logged="true">' +
             '    <title>Happy</title>' +
             '    <todo>Work</todo>' +
             '    <todo>Play</todo>' +
             '</note>';
-var arrayBuffer = new ArrayBuffer(strXml.length);
-var bufView = new Uint8Array(arrayBuffer);
-var strLen = strXml.length;
+let arrayBuffer = new ArrayBuffer(strXml.length);
+let bufView = new Uint8Array(arrayBuffer);
+let strLen = strXml.length;
 for (var i = 0; i < strLen; ++i) {
     bufView[i] = strXml.charCodeAt(i);
 }
-var that = new xml.XmlPullParser(arrayBuffer);
-var arrTag = {};
-var str = "";
-var i = 0;
+let that = new xml.XmlPullParser(arrayBuffer);
+let arrTag = {};
+let str = "";
+let i = 0;
 function func(key, value){
     arrTag[i] = 'key:'+key+' value:'+ value.getDepth();
     str += arrTag[i];
     i++;
     return true; // Determines whether to continuely parse, which is used to continue or terminate parsing.
 }
-var options = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
+let options = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
 that.parse(options);
 console.log(str);
 // 输出: