!9795 Modify the xml module xts example

Merge pull request !9795 from 小马奔腾/master

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

@@ -338,8 +338,8 @@ let strXml =
 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);
+for (var tmp = 0; tmp < strLen; ++tmp) {
+    bufView[tmp] = strXml.charCodeAt(tmp);
 }
 let that = new xml.XmlPullParser(arrayBuffer);
 let arrTag = {};