diff --git a/zh-cn/application-dev/reference/apis/js-apis-distributed-data.md b/zh-cn/application-dev/reference/apis/js-apis-distributed-data.md
index 76c59c43b8992ed7271d6f26475e7f365cfa0836..3af1de476fd749b7d21f5dd1e5f466318175b1e7 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-distributed-data.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-distributed-data.md
@@ -282,7 +282,7 @@ put(key: string, value: Uint8Array | string | number | boolean, callback: AsyncC
   const KEY_TEST_STRING_ELEMENT = 'key_test_string';
   const VALUE_TEST_STRING_ELEMENT = 'value-test-string';
   try {
-      kvStore.put(KEY_TEST_STRING_ELEMENT, VALUE_TEST_STRING_ELEMENT, function (err,data) {
+      kvStore.put(KEY_TEST_STRING_ELEMENT, VALUE_TEST_STRING_ELEMENT, function (err, data) {
           if (err != undefined) {
               console.log("put err: " + JSON.stringify(err));
               return;
@@ -347,13 +347,13 @@ delete(key: string, callback: AsyncCallback<void>): void
   const KEY_TEST_STRING_ELEMENT = 'key_test_string';
   const VALUE_TEST_STRING_ELEMENT = 'value-test-string';
   try {
-      kvStore.put(KEY_TEST_STRING_ELEMENT, VALUE_TEST_STRING_ELEMENT, function (err,data) {
+      kvStore.put(KEY_TEST_STRING_ELEMENT, VALUE_TEST_STRING_ELEMENT, function (err, data) {
           if (err != undefined) {
               console.log("put err: " + JSON.stringify(err));
               return;
           }
           console.log("put success");
-          kvStore.delete(KEY_TEST_STRING_ELEMENT, function (err,data) {
+          kvStore.delete(KEY_TEST_STRING_ELEMENT, function (err, data) {
               if (err != undefined) {
                   console.log("delete err: " + JSON.stringify(err));
                   return;
@@ -526,13 +526,13 @@ get(key: string, callback: AsyncCallback<Uint8Array | string | boolean | numb
   const KEY_TEST_STRING_ELEMENT = 'key_test_string';
   const VALUE_TEST_STRING_ELEMENT = 'value-test-string';
   try {
-      kvStore.put(KEY_TEST_STRING_ELEMENT, VALUE_TEST_STRING_ELEMENT, function (err,data) {
+      kvStore.put(KEY_TEST_STRING_ELEMENT, VALUE_TEST_STRING_ELEMENT, function (err, data) {
           if (err != undefined) {
               console.log("put err: " + JSON.stringify(err));
               return;
           }
           console.log("put success");
-          kvStore.get(KEY_TEST_STRING_ELEMENT, function (err,data) {
+          kvStore.get(KEY_TEST_STRING_ELEMENT, function (err, data) {
               console.log("get success data: " + data);
           });
       });