diff --git a/README.md b/README.md
index 0f4f5b0b9..203860350 100644
--- a/README.md
+++ b/README.md
@@ -1880,7 +1880,7 @@ object:
   - headers {Object} response headers
   - size {Number} response size
   - rt {Number} request total use time (ms)
-- nextAppendPosition {String} the next position
+- nextAppendPosition {String} the next position（The browser needs to set cross domain and expose the x-oss-next-append-position header）
 
 example:
 
diff --git a/test/browser/browser.test.js b/test/browser/browser.test.js
index c4e53d83d..3a9886d52 100644
--- a/test/browser/browser.test.js
+++ b/test/browser/browser.test.js
@@ -2449,4 +2449,39 @@ describe('browser', () => {
       assert.equal(header['x-oss-server-side-encryption'], undefined);
     });
   });
+
+  describe('append()', () => {
+    const name = `/${prefix}ali-sdk/oss/apend${Date.now()}`;
+    let store;
+    before(() => {
+      store = oss(ossConfig);
+    });
+
+    afterEach(async () => {
+      await store.delete(name);
+    });
+
+    it('should apend object with content blob', async () => {
+      let object = await store.append(name, new Blob(['foo']));
+      const { nextAppendPosition } = object;
+      assert.strictEqual(object.res.status, 200);
+      assert.strictEqual(nextAppendPosition, '3');
+      assert.strictEqual(object.res.headers['x-oss-next-append-position'], '3');
+
+      let res = await store.get(name);
+      assert.strictEqual(res.content.toString(), 'foo');
+      assert.strictEqual(res.res.headers['x-oss-next-append-position'], '3');
+
+      object = await store.append(name, new Blob(['bar']), {
+        position: nextAppendPosition
+      });
+      assert.strictEqual(object.res.status, 200);
+      assert.strictEqual(object.nextAppendPosition, '6');
+      assert.strictEqual(object.res.headers['x-oss-next-append-position'], '6');
+
+      res = await store.get(name, { subres: { 'response-cache-control': 'no-store' } });
+      assert.strictEqual(res.content.toString(), 'foobar');
+      assert.strictEqual(res.res.headers['x-oss-next-append-position'], '6');
+    });
+  });
 });
diff --git a/test/node/object.test.js b/test/node/object.test.js
index 31a2a4fc7..baed1a88e 100644
--- a/test/node/object.test.js
+++ b/test/node/object.test.js
@@ -2115,24 +2115,24 @@ describe('test/object.test.js', () => {
 
     it('should apend object with content buffer', async () => {
       let object = await store.append(name, Buffer.from('foo'));
-      assert(object.res.status === 200);
-      assert(object.nextAppendPosition === '3');
-      assert(object.res.headers['x-oss-next-append-position'] === '3');
+      assert.strictEqual(object.res.status, 200);
+      assert.strictEqual(object.nextAppendPosition, '3');
+      assert.strictEqual(object.res.headers['x-oss-next-append-position'], '3');
 
       let res = await store.get(name);
-      assert(res.content.toString() === 'foo');
-      assert(res.res.headers['x-oss-next-append-position'] === '3');
+      assert.strictEqual(res.content.toString(), 'foo');
+      assert.strictEqual(res.res.headers['x-oss-next-append-position'], '3');
 
       object = await store.append(name, Buffer.from('bar'), {
         position: 3
       });
-      assert(object.res.status === 200);
-      assert(object.nextAppendPosition === '6');
-      assert(object.res.headers['x-oss-next-append-position'] === '6');
+      assert.strictEqual(object.res.status, 200);
+      assert.strictEqual(object.nextAppendPosition, '6');
+      assert.strictEqual(object.res.headers['x-oss-next-append-position'], '6');
 
       res = await store.get(name);
-      assert(res.content.toString() === 'foobar');
-      assert(res.res.headers['x-oss-next-append-position'] === '6');
+      assert.strictEqual(res.content.toString(), 'foobar');
+      assert.strictEqual(res.res.headers['x-oss-next-append-position'], '6');
     });
 
     it('should apend object with local file path', async () => {