diff --git a/en/application-dev/reference/apis/js-apis-xml.md b/en/application-dev/reference/apis/js-apis-xml.md
index c7d28fe1bf86073c4453ea9e2cf9cbcb3698062e..b41067a747b8904b1ecd707d8731c7a5668e00fb 100644
--- a/en/application-dev/reference/apis/js-apis-xml.md
+++ b/en/application-dev/reference/apis/js-apis-xml.md
@@ -302,7 +302,7 @@ var strXml =
             '    <todo>Work</todo>' +
             '    <todo>Play</todo>' +
             '</note>';
-var arrayBuffer = new ArrayBuffer(strXml.length*2);
+var arrayBuffer = new ArrayBuffer(strXml.length);
 var bufView = new Uint8Array(arrayBuffer);
 var strLen = strXml.length;
 for (var i = 0; i < strLen; ++i) {
@@ -336,7 +336,7 @@ var strXml =
             '    <todo>Work</todo>' +
             '    <todo>Play</todo>' +
             '</note>';
-var arrayBuffer = new ArrayBuffer(strXml.length*2);
+var arrayBuffer = new ArrayBuffer(strXml.length);
 var bufView = new Uint8Array(arrayBuffer);
 var strLen = strXml.length;
 for (var i = 0; i < strLen; ++i) {
diff --git a/zh-cn/application-dev/reference/apis/js-apis-xml.md b/zh-cn/application-dev/reference/apis/js-apis-xml.md
index eb3c17079cef9a016156179ee6b3f97e13dc26e6..7d573cf82dd1203054dc4aaec9465ebfd003971f 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-xml.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-xml.md
@@ -301,7 +301,7 @@ var strXml =
             '    <todo>Work</todo>' +
             '    <todo>Play</todo>' +
             '</note>';
-var arrayBuffer = new ArrayBuffer(strXml.length*2);
+var arrayBuffer = new ArrayBuffer(strXml.length);
 var bufView = new Uint8Array(arrayBuffer);
 var strLen = strXml.length;
 for (var i = 0; i < strLen; ++i) {
@@ -335,7 +335,7 @@ var strXml =
             '    <todo>Work</todo>' +
             '    <todo>Play</todo>' +
             '</note>';
-var arrayBuffer = new ArrayBuffer(strXml.length*2);
+var arrayBuffer = new ArrayBuffer(strXml.length);
 var bufView = new Uint8Array(arrayBuffer);
 var strLen = strXml.length;
 for (var i = 0; i < strLen; ++i) {