diff --git a/demo-album/lib/cos-wx-sdk-v5.js b/demo-album/lib/cos-wx-sdk-v5.js
index c7ba392..4580e5d 100644
--- a/demo-album/lib/cos-wx-sdk-v5.js
+++ b/demo-album/lib/cos-wx-sdk-v5.js
@@ -97,6 +97,34 @@ function camSafeUrlEncode(str) {
         .replace(/\*/g, '%2A');
 }
 
+function getObjectKeys(obj, forKey) {
+  var list = [];
+  for (var key in obj) {
+      if (obj.hasOwnProperty(key)) {
+          list.push(forKey ? camSafeUrlEncode(key).toLowerCase() : key);
+      }
+  }
+  return list.sort(function (a, b) {
+      a = a.toLowerCase();
+      b = b.toLowerCase();
+      return a === b ? 0 : (a > b ? 1 : -1);
+  });
+};
+
+var obj2str = function (obj) {
+  var i, key, val;
+  var list = [];
+  var keyList = getObjectKeys(obj);
+  for (i = 0; i < keyList.length; i++) {
+      key = keyList[i];
+      val = (obj[key] === undefined || obj[key] === null) ? '' : ('' + obj[key]);
+      key = camSafeUrlEncode(key).toLowerCase();
+      val = camSafeUrlEncode(val) || '';
+      list.push(key + '=' + val)
+  }
+  return list.join('&');
+};
+
 //测试用的key后面可以去掉
 var getAuth = function (opt) {
     opt = opt || {};
@@ -120,34 +148,6 @@ var getAuth = function (opt) {
     if (!SecretId) return console.error('missing param SecretId');
     if (!SecretKey) return console.error('missing param SecretKey');
 
-    var getObjectKeys = function (obj, forKey) {
-        var list = [];
-        for (var key in obj) {
-            if (obj.hasOwnProperty(key)) {
-                list.push(forKey ? camSafeUrlEncode(key).toLowerCase() : key);
-            }
-        }
-        return list.sort(function (a, b) {
-            a = a.toLowerCase();
-            b = b.toLowerCase();
-            return a === b ? 0 : (a > b ? 1 : -1);
-        });
-    };
-
-    var obj2str = function (obj) {
-        var i, key, val;
-        var list = [];
-        var keyList = getObjectKeys(obj);
-        for (i = 0; i < keyList.length; i++) {
-            key = keyList[i];
-            val = (obj[key] === undefined || obj[key] === null) ? '' : ('' + obj[key]);
-            key = camSafeUrlEncode(key).toLowerCase();
-            val = camSafeUrlEncode(val) || '';
-            list.push(key + '=' + val)
-        }
-        return list.join('&');
-    };
-
     // 签名有效起止时间
     var now = Math.round(getSkewTime(opt.SystemClockOffset) / 1000) - 1;
     var exp = now;
@@ -172,7 +172,7 @@ var getAuth = function (opt) {
     var signKey = CryptoJS.HmacSHA1(qKeyTime, SecretKey).toString();
 
     // 步骤二：构成 FormatString
-    var formatString = [method, pathname, obj2str(queryParams), obj2str(headers), ''].join('\n');
+    var formatString = [method, pathname, util.obj2str(queryParams), util.obj2str(headers), ''].join('\n');
 
     // 步骤三：计算 StringToSign
     var stringToSign = ['sha1', qSignTime, CryptoJS.SHA1(formatString).toString(), ''].join('\n');
@@ -655,6 +655,7 @@ var util = {
     throttleOnProgress: throttleOnProgress,
     getFileSize: getFileSize,
     getSkewTime: getSkewTime,
+    obj2str: obj2str,
     getAuth: getAuth,
     compareVersion: compareVersion,
     canFileSlice: canFileSlice,
@@ -2338,7 +2339,7 @@ base.init(COS, task);
 advance.init(COS, task);
 
 COS.getAuthorization = util.getAuth;
-COS.version = '1.0.10';
+COS.version = '1.0.11';
 
 module.exports = COS;
 
diff --git a/demo/lib/cos-wx-sdk-v5.js b/demo/lib/cos-wx-sdk-v5.js
index c7ba392..4580e5d 100644
--- a/demo/lib/cos-wx-sdk-v5.js
+++ b/demo/lib/cos-wx-sdk-v5.js
@@ -97,6 +97,34 @@ function camSafeUrlEncode(str) {
         .replace(/\*/g, '%2A');
 }
 
+function getObjectKeys(obj, forKey) {
+  var list = [];
+  for (var key in obj) {
+      if (obj.hasOwnProperty(key)) {
+          list.push(forKey ? camSafeUrlEncode(key).toLowerCase() : key);
+      }
+  }
+  return list.sort(function (a, b) {
+      a = a.toLowerCase();
+      b = b.toLowerCase();
+      return a === b ? 0 : (a > b ? 1 : -1);
+  });
+};
+
+var obj2str = function (obj) {
+  var i, key, val;
+  var list = [];
+  var keyList = getObjectKeys(obj);
+  for (i = 0; i < keyList.length; i++) {
+      key = keyList[i];
+      val = (obj[key] === undefined || obj[key] === null) ? '' : ('' + obj[key]);
+      key = camSafeUrlEncode(key).toLowerCase();
+      val = camSafeUrlEncode(val) || '';
+      list.push(key + '=' + val)
+  }
+  return list.join('&');
+};
+
 //测试用的key后面可以去掉
 var getAuth = function (opt) {
     opt = opt || {};
@@ -120,34 +148,6 @@ var getAuth = function (opt) {
     if (!SecretId) return console.error('missing param SecretId');
     if (!SecretKey) return console.error('missing param SecretKey');
 
-    var getObjectKeys = function (obj, forKey) {
-        var list = [];
-        for (var key in obj) {
-            if (obj.hasOwnProperty(key)) {
-                list.push(forKey ? camSafeUrlEncode(key).toLowerCase() : key);
-            }
-        }
-        return list.sort(function (a, b) {
-            a = a.toLowerCase();
-            b = b.toLowerCase();
-            return a === b ? 0 : (a > b ? 1 : -1);
-        });
-    };
-
-    var obj2str = function (obj) {
-        var i, key, val;
-        var list = [];
-        var keyList = getObjectKeys(obj);
-        for (i = 0; i < keyList.length; i++) {
-            key = keyList[i];
-            val = (obj[key] === undefined || obj[key] === null) ? '' : ('' + obj[key]);
-            key = camSafeUrlEncode(key).toLowerCase();
-            val = camSafeUrlEncode(val) || '';
-            list.push(key + '=' + val)
-        }
-        return list.join('&');
-    };
-
     // 签名有效起止时间
     var now = Math.round(getSkewTime(opt.SystemClockOffset) / 1000) - 1;
     var exp = now;
@@ -172,7 +172,7 @@ var getAuth = function (opt) {
     var signKey = CryptoJS.HmacSHA1(qKeyTime, SecretKey).toString();
 
     // 步骤二：构成 FormatString
-    var formatString = [method, pathname, obj2str(queryParams), obj2str(headers), ''].join('\n');
+    var formatString = [method, pathname, util.obj2str(queryParams), util.obj2str(headers), ''].join('\n');
 
     // 步骤三：计算 StringToSign
     var stringToSign = ['sha1', qSignTime, CryptoJS.SHA1(formatString).toString(), ''].join('\n');
@@ -655,6 +655,7 @@ var util = {
     throttleOnProgress: throttleOnProgress,
     getFileSize: getFileSize,
     getSkewTime: getSkewTime,
+    obj2str: obj2str,
     getAuth: getAuth,
     compareVersion: compareVersion,
     canFileSlice: canFileSlice,
@@ -2338,7 +2339,7 @@ base.init(COS, task);
 advance.init(COS, task);
 
 COS.getAuthorization = util.getAuth;
-COS.version = '1.0.10';
+COS.version = '1.0.11';
 
 module.exports = COS;
 
diff --git a/package.json b/package.json
index 377a550..488b87d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "cos-wx-sdk-v5",
-  "version": "1.0.10",
+  "version": "1.0.11",
   "description": "小程序 SDK for [腾讯云对象存储服务](https://cloud.tencent.com/product/cos)",
   "main": "demo/lib/cos-wx-sdk-v5.js",
   "scripts": {
diff --git a/src/cos.js b/src/cos.js
index b4d8f9b..b20b341 100644
--- a/src/cos.js
+++ b/src/cos.js
@@ -57,6 +57,6 @@ base.init(COS, task);
 advance.init(COS, task);
 
 COS.getAuthorization = util.getAuth;
-COS.version = '1.0.10';
+COS.version = '1.0.11';
 
 module.exports = COS;
diff --git a/src/util.js b/src/util.js
index 666693c..e874f85 100644
--- a/src/util.js
+++ b/src/util.js
@@ -17,6 +17,34 @@ function camSafeUrlEncode(str) {
         .replace(/\*/g, '%2A');
 }
 
+function getObjectKeys(obj, forKey) {
+  var list = [];
+  for (var key in obj) {
+      if (obj.hasOwnProperty(key)) {
+          list.push(forKey ? camSafeUrlEncode(key).toLowerCase() : key);
+      }
+  }
+  return list.sort(function (a, b) {
+      a = a.toLowerCase();
+      b = b.toLowerCase();
+      return a === b ? 0 : (a > b ? 1 : -1);
+  });
+};
+
+var obj2str = function (obj) {
+  var i, key, val;
+  var list = [];
+  var keyList = getObjectKeys(obj);
+  for (i = 0; i < keyList.length; i++) {
+      key = keyList[i];
+      val = (obj[key] === undefined || obj[key] === null) ? '' : ('' + obj[key]);
+      key = camSafeUrlEncode(key).toLowerCase();
+      val = camSafeUrlEncode(val) || '';
+      list.push(key + '=' + val)
+  }
+  return list.join('&');
+};
+
 //测试用的key后面可以去掉
 var getAuth = function (opt) {
     opt = opt || {};
@@ -40,34 +68,6 @@ var getAuth = function (opt) {
     if (!SecretId) return console.error('missing param SecretId');
     if (!SecretKey) return console.error('missing param SecretKey');
 
-    var getObjectKeys = function (obj, forKey) {
-        var list = [];
-        for (var key in obj) {
-            if (obj.hasOwnProperty(key)) {
-                list.push(forKey ? camSafeUrlEncode(key).toLowerCase() : key);
-            }
-        }
-        return list.sort(function (a, b) {
-            a = a.toLowerCase();
-            b = b.toLowerCase();
-            return a === b ? 0 : (a > b ? 1 : -1);
-        });
-    };
-
-    var obj2str = function (obj) {
-        var i, key, val;
-        var list = [];
-        var keyList = getObjectKeys(obj);
-        for (i = 0; i < keyList.length; i++) {
-            key = keyList[i];
-            val = (obj[key] === undefined || obj[key] === null) ? '' : ('' + obj[key]);
-            key = camSafeUrlEncode(key).toLowerCase();
-            val = camSafeUrlEncode(val) || '';
-            list.push(key + '=' + val)
-        }
-        return list.join('&');
-    };
-
     // 签名有效起止时间
     var now = Math.round(getSkewTime(opt.SystemClockOffset) / 1000) - 1;
     var exp = now;
@@ -92,7 +92,7 @@ var getAuth = function (opt) {
     var signKey = CryptoJS.HmacSHA1(qKeyTime, SecretKey).toString();
 
     // 步骤二：构成 FormatString
-    var formatString = [method, pathname, obj2str(queryParams), obj2str(headers), ''].join('\n');
+    var formatString = [method, pathname, util.obj2str(queryParams), util.obj2str(headers), ''].join('\n');
 
     // 步骤三：计算 StringToSign
     var stringToSign = ['sha1', qSignTime, CryptoJS.SHA1(formatString).toString(), ''].join('\n');
@@ -575,6 +575,7 @@ var util = {
     throttleOnProgress: throttleOnProgress,
     getFileSize: getFileSize,
     getSkewTime: getSkewTime,
+    obj2str: obj2str,
     getAuth: getAuth,
     compareVersion: compareVersion,
     canFileSlice: canFileSlice,