diff --git a/dist/store.common.js b/dist/store.common.js
index 8bff957..f49c149 100644
--- a/dist/store.common.js
+++ b/dist/store.common.js
@@ -128,7 +128,7 @@ Store.prototype = {
     return d;
   },
   forEach: function forEach(callback) {
-    for (var i = 0; i < storage.length; i++) {
+    for (var i = 0, len = storage.length; i < len; i++) {
       var key = storage.key(i);
       callback(key, this.get(key));
     }
@@ -139,7 +139,7 @@ Store.prototype = {
     var arr = this.keys(),
         dt = {};
 
-    for (var i = 0; i < arr.length; i++) {
+    for (var i = 0, len = arr.length; i < len; i++) {
       if (arr[i].indexOf(str) > -1) dt[arr[i]] = this.get(arr[i]);
     }
 
@@ -171,7 +171,7 @@ function store(key, data) {
   }
 
   if (argm.length === 2 && isArray(key) && isFunction(data)) {
-    for (var i = 0; i < key.length; i++) {
+    for (var i = 0, len = key.length; i < len; i++) {
       dt = data(key[i], _Store.get(key[i]));
       store.set(key[i], dt);
     }
diff --git a/dist/store.common.min.js b/dist/store.common.min.js
index 3a9e578..a51c443 100644
--- a/dist/store.common.min.js
+++ b/dist/store.common.min.js
@@ -1,2 +1,2 @@
 /*! storejs v1.0.24 | MIT (c) 2018 kenny wang <wowohoo@qq.com> | https://github.com/jaywcjlove/store.js */
-"use strict";var storage=window.localStorage;function isJSON(t){return t=JSON.stringify(t),/^\{[\s\S]*\}$/.test(t)}function stringify(t){return void 0===t||"function"==typeof t?t+"":JSON.stringify(t)}function deserialize(e){if("string"==typeof e)try{return JSON.parse(e)}catch(t){return e}}function isFunction(t){return"[object Function]"==={}.toString.call(t)}function isArray(t){return"[object Array]"===Object.prototype.toString.call(t)}function dealIncognito(e){var t="_Is_Incognit";try{e.setItem(t,"yes")}catch(t){if("QuotaExceededError"===t.name){var r=function(){};e.__proto__={setItem:r,getItem:r,removeItem:r,clear:r}}}finally{"yes"===e.getItem(t)&&e.removeItem(t)}return e}function Store(){if(!(this instanceof Store))return new Store}storage=dealIncognito(storage),Store.prototype={set:function(t,e){if(t&&!isJSON(t))storage.setItem(t,stringify(e));else if(isJSON(t))for(var r in t)this.set(r,t[r]);return this},get:function(t){if(t)return"?"===t.charAt(0)?this.has(t.substr(1)):deserialize(storage.getItem(t));var r={};return this.forEach(function(t,e){return r[t]=e}),r},clear:function(){return storage.clear(),this},remove:function(t){var e=this.get(t);return storage.removeItem(t),e},has:function(t){return{}.hasOwnProperty.call(this.get(),t)},keys:function(){var e=[];return this.forEach(function(t){e.push(t)}),e},forEach:function(t){for(var e=0;e<storage.length;e++){var r=storage.key(e);t(r,this.get(r))}return this},search:function(t){for(var e=this.keys(),r={},n=0;n<e.length;n++)-1<e[n].indexOf(t)&&(r[e[n]]=this.get(e[n]));return r}};var _Store=null;function store(t,e){var r=arguments,n=null;if(_Store||(_Store=Store()),0===r.length)return _Store.get();if(1===r.length){if("string"==typeof t)return _Store.get(t);if(isJSON(t))return _Store.set(t)}if(2===r.length&&"string"==typeof t){if(!e)return _Store.remove(t);if(e&&"string"==typeof e)return _Store.set(t,e);e&&isFunction(e)&&(n=null,n=e(t,_Store.get(t)),store.set(t,n))}if(2===r.length&&isArray(t)&&isFunction(e))for(var o=0;o<t.length;o++)n=e(t[o],_Store.get(t[o])),store.set(t[o],n);return store}for(var a in Store.prototype)store[a]=Store.prototype[a];module.exports=store;
\ No newline at end of file
+"use strict";var storage=window.localStorage;function isJSON(t){return t=JSON.stringify(t),/^\{[\s\S]*\}$/.test(t)}function stringify(t){return void 0===t||"function"==typeof t?t+"":JSON.stringify(t)}function deserialize(e){if("string"==typeof e)try{return JSON.parse(e)}catch(t){return e}}function isFunction(t){return"[object Function]"==={}.toString.call(t)}function isArray(t){return"[object Array]"===Object.prototype.toString.call(t)}function dealIncognito(e){var t="_Is_Incognit";try{e.setItem(t,"yes")}catch(t){if("QuotaExceededError"===t.name){var r=function(){};e.__proto__={setItem:r,getItem:r,removeItem:r,clear:r}}}finally{"yes"===e.getItem(t)&&e.removeItem(t)}return e}function Store(){if(!(this instanceof Store))return new Store}storage=dealIncognito(storage),Store.prototype={set:function(t,e){if(t&&!isJSON(t))storage.setItem(t,stringify(e));else if(isJSON(t))for(var r in t)this.set(r,t[r]);return this},get:function(t){if(t)return"?"===t.charAt(0)?this.has(t.substr(1)):deserialize(storage.getItem(t));var r={};return this.forEach(function(t,e){return r[t]=e}),r},clear:function(){return storage.clear(),this},remove:function(t){var e=this.get(t);return storage.removeItem(t),e},has:function(t){return{}.hasOwnProperty.call(this.get(),t)},keys:function(){var e=[];return this.forEach(function(t){e.push(t)}),e},forEach:function(t){for(var e=0,r=storage.length;e<r;e++){var n=storage.key(e);t(n,this.get(n))}return this},search:function(t){for(var e=this.keys(),r={},n=0,o=e.length;n<o;n++)-1<e[n].indexOf(t)&&(r[e[n]]=this.get(e[n]));return r}};var _Store=null;function store(t,e){var r=arguments,n=null;if(_Store||(_Store=Store()),0===r.length)return _Store.get();if(1===r.length){if("string"==typeof t)return _Store.get(t);if(isJSON(t))return _Store.set(t)}if(2===r.length&&"string"==typeof t){if(!e)return _Store.remove(t);if(e&&"string"==typeof e)return _Store.set(t,e);e&&isFunction(e)&&(n=null,n=e(t,_Store.get(t)),store.set(t,n))}if(2===r.length&&isArray(t)&&isFunction(e))for(var o=0,i=t.length;o<i;o++)n=e(t[o],_Store.get(t[o])),store.set(t[o],n);return store}for(var a in Store.prototype)store[a]=Store.prototype[a];module.exports=store;
\ No newline at end of file
diff --git a/dist/store.esm.js b/dist/store.esm.js
index 39e1336..793e42e 100644
--- a/dist/store.esm.js
+++ b/dist/store.esm.js
@@ -126,7 +126,7 @@ Store.prototype = {
     return d;
   },
   forEach: function forEach(callback) {
-    for (var i = 0; i < storage.length; i++) {
+    for (var i = 0, len = storage.length; i < len; i++) {
       var key = storage.key(i);
       callback(key, this.get(key));
     }
@@ -137,7 +137,7 @@ Store.prototype = {
     var arr = this.keys(),
         dt = {};
 
-    for (var i = 0; i < arr.length; i++) {
+    for (var i = 0, len = arr.length; i < len; i++) {
       if (arr[i].indexOf(str) > -1) dt[arr[i]] = this.get(arr[i]);
     }
 
@@ -169,7 +169,7 @@ function store(key, data) {
   }
 
   if (argm.length === 2 && isArray(key) && isFunction(data)) {
-    for (var i = 0; i < key.length; i++) {
+    for (var i = 0, len = key.length; i < len; i++) {
       dt = data(key[i], _Store.get(key[i]));
       store.set(key[i], dt);
     }
diff --git a/dist/store.js b/dist/store.js
index 364392b..414443b 100644
--- a/dist/store.js
+++ b/dist/store.js
@@ -132,7 +132,7 @@
       return d;
     },
     forEach: function forEach(callback) {
-      for (var i = 0; i < storage.length; i++) {
+      for (var i = 0, len = storage.length; i < len; i++) {
         var key = storage.key(i);
         callback(key, this.get(key));
       }
@@ -143,7 +143,7 @@
       var arr = this.keys(),
           dt = {};
 
-      for (var i = 0; i < arr.length; i++) {
+      for (var i = 0, len = arr.length; i < len; i++) {
         if (arr[i].indexOf(str) > -1) dt[arr[i]] = this.get(arr[i]);
       }
 
@@ -175,7 +175,7 @@
     }
 
     if (argm.length === 2 && isArray(key) && isFunction(data)) {
-      for (var i = 0; i < key.length; i++) {
+      for (var i = 0, len = key.length; i < len; i++) {
         dt = data(key[i], _Store.get(key[i]));
         store.set(key[i], dt);
       }
diff --git a/dist/store.min.js b/dist/store.min.js
index f6f2361..7daaebb 100644
--- a/dist/store.min.js
+++ b/dist/store.min.js
@@ -1,2 +1,2 @@
 /*! storejs v1.0.24 | MIT (c) 2018 kenny wang <wowohoo@qq.com> | https://github.com/jaywcjlove/store.js */
-!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):t.store=e()}(this,function(){"use strict";var i=window.localStorage;function o(t){return t=JSON.stringify(t),/^\{[\s\S]*\}$/.test(t)}function f(t){return"[object Function]"==={}.toString.call(t)}function u(){if(!(this instanceof u))return new u}i=function(e){var t="_Is_Incognit";try{e.setItem(t,"yes")}catch(t){if("QuotaExceededError"===t.name){var r=function(){};e.__proto__={setItem:r,getItem:r,removeItem:r,clear:r}}}finally{"yes"===e.getItem(t)&&e.removeItem(t)}return e}(i),u.prototype={set:function(t,e){if(t&&!o(t))i.setItem(t,void 0===(n=e)||"function"==typeof n?n+"":JSON.stringify(n));else if(o(t))for(var r in t)this.set(r,t[r]);var n;return this},get:function(t){if(t)return"?"===t.charAt(0)?this.has(t.substr(1)):function(e){if("string"==typeof e)try{return JSON.parse(e)}catch(t){return e}}(i.getItem(t));var r={};return this.forEach(function(t,e){return r[t]=e}),r},clear:function(){return i.clear(),this},remove:function(t){var e=this.get(t);return i.removeItem(t),e},has:function(t){return{}.hasOwnProperty.call(this.get(),t)},keys:function(){var e=[];return this.forEach(function(t){e.push(t)}),e},forEach:function(t){for(var e=0;e<i.length;e++){var r=i.key(e);t(r,this.get(r))}return this},search:function(t){for(var e=this.keys(),r={},n=0;n<e.length;n++)-1<e[n].indexOf(t)&&(r[e[n]]=this.get(e[n]));return r}};var s=null;function c(t,e){var r=arguments,n=null;if(s||(s=u()),0===r.length)return s.get();if(1===r.length){if("string"==typeof t)return s.get(t);if(o(t))return s.set(t)}if(2===r.length&&"string"==typeof t){if(!e)return s.remove(t);if(e&&"string"==typeof e)return s.set(t,e);e&&f(e)&&(n=null,n=e(t,s.get(t)),c.set(t,n))}if(2===r.length&&"[object Array]"===Object.prototype.toString.call(t)&&f(e))for(var i=0;i<t.length;i++)n=e(t[i],s.get(t[i])),c.set(t[i],n);return c}for(var t in u.prototype)c[t]=u.prototype[t];return c});
\ No newline at end of file
+!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):t.store=e()}(this,function(){"use strict";var i=window.localStorage;function f(t){return t=JSON.stringify(t),/^\{[\s\S]*\}$/.test(t)}function u(t){return"[object Function]"==={}.toString.call(t)}function s(){if(!(this instanceof s))return new s}i=function(e){var t="_Is_Incognit";try{e.setItem(t,"yes")}catch(t){if("QuotaExceededError"===t.name){var r=function(){};e.__proto__={setItem:r,getItem:r,removeItem:r,clear:r}}}finally{"yes"===e.getItem(t)&&e.removeItem(t)}return e}(i),s.prototype={set:function(t,e){if(t&&!f(t))i.setItem(t,void 0===(n=e)||"function"==typeof n?n+"":JSON.stringify(n));else if(f(t))for(var r in t)this.set(r,t[r]);var n;return this},get:function(t){if(t)return"?"===t.charAt(0)?this.has(t.substr(1)):function(e){if("string"==typeof e)try{return JSON.parse(e)}catch(t){return e}}(i.getItem(t));var r={};return this.forEach(function(t,e){return r[t]=e}),r},clear:function(){return i.clear(),this},remove:function(t){var e=this.get(t);return i.removeItem(t),e},has:function(t){return{}.hasOwnProperty.call(this.get(),t)},keys:function(){var e=[];return this.forEach(function(t){e.push(t)}),e},forEach:function(t){for(var e=0,r=i.length;e<r;e++){var n=i.key(e);t(n,this.get(n))}return this},search:function(t){for(var e=this.keys(),r={},n=0,i=e.length;n<i;n++)-1<e[n].indexOf(t)&&(r[e[n]]=this.get(e[n]));return r}};var c=null;function a(t,e){var r=arguments,n=null;if(c||(c=s()),0===r.length)return c.get();if(1===r.length){if("string"==typeof t)return c.get(t);if(f(t))return c.set(t)}if(2===r.length&&"string"==typeof t){if(!e)return c.remove(t);if(e&&"string"==typeof e)return c.set(t,e);e&&u(e)&&(n=null,n=e(t,c.get(t)),a.set(t,n))}if(2===r.length&&"[object Array]"===Object.prototype.toString.call(t)&&u(e))for(var i=0,o=t.length;i<o;i++)n=e(t[i],c.get(t[i])),a.set(t[i],n);return a}for(var t in s.prototype)a[t]=s.prototype[t];return a});
\ No newline at end of file