diff --git a/dist/hotkeys.common.js b/dist/hotkeys.common.js
index ede7471..061caac 100644
--- a/dist/hotkeys.common.js
+++ b/dist/hotkeys.common.js
@@ -1,5 +1,5 @@
 /*!
- * hotkeys-js v3.4.0
+ * hotkeys-js v3.4.1
  * A simple micro-library for defining and dispatching keyboard shortcuts. It has no dependencies.
  * 
  * Copyright (c) 2018 kenny wong <wowohoo@qq.com>
diff --git a/dist/hotkeys.common.min.js b/dist/hotkeys.common.min.js
index c021168..6e9f1f0 100644
--- a/dist/hotkeys.common.min.js
+++ b/dist/hotkeys.common.min.js
@@ -1,2 +1,2 @@
-/*! hotkeys-js v3.4.0 | MIT (c) 2018 kenny wong <wowohoo@qq.com> | http://jaywcjlove.github.io/hotkeys */
+/*! hotkeys-js v3.4.1 | MIT (c) 2018 kenny wong <wowohoo@qq.com> | http://jaywcjlove.github.io/hotkeys */
 "use strict";var isff="undefined"!=typeof navigator&&0<navigator.userAgent.toLowerCase().indexOf("firefox");function addEvent(e,o,t){e.addEventListener?e.addEventListener(o,t,!1):e.attachEvent&&e.attachEvent("on"+o,function(){t(window.event)})}function getMods(e,o){for(var t=o.slice(0,o.length-1),n=0;n<t.length;n++)t[n]=e[t[n].toLowerCase()];return t}function getKeys(e){e||(e="");for(var o=(e=e.replace(/\s/g,"")).split(","),t=o.lastIndexOf("");0<=t;)o[t-1]+=",",o.splice(t,1),t=o.lastIndexOf("");return o}function compareArray(e,o){for(var t=e.length<o.length?o:e,n=e.length<o.length?e:o,r=!0,s=0;s<t.length;s++)-1===n.indexOf(t[s])&&(r=!1);return r}for(var _keyMap={backspace:8,tab:9,clear:12,enter:13,return:13,esc:27,escape:27,space:32,left:37,up:38,right:39,down:40,del:46,delete:46,ins:45,insert:45,home:36,end:35,pageup:33,pagedown:34,capslock:20,"\u21ea":20,",":188,".":190,"/":191,"`":192,"-":isff?173:189,"=":isff?61:187,";":isff?59:186,"'":222,"[":219,"]":221,"\\":220},_modifier={"\u21e7":16,shift:16,"\u2325":18,alt:18,option:18,"\u2303":17,ctrl:17,control:17,"\u2318":isff?224:91,cmd:isff?224:91,command:isff?224:91},_downKeys=[],modifierMap={16:"shiftKey",18:"altKey",17:"ctrlKey"},_mods={16:!1,18:!1,17:!1},_handlers={},k=1;k<20;k++)_keyMap["f"+k]=111+k;var _scope="all",isBindElement=_mods[isff?224:91]=!(modifierMap[isff?224:91]="metaKey"),code=function(e){return _keyMap[e.toLowerCase()]||_modifier[e.toLowerCase()]||e.toUpperCase().charCodeAt(0)};function setScope(e){_scope=e||"all"}function getScope(){return _scope||"all"}function getPressedKeyCodes(){return _downKeys.slice(0)}function filter(e){var o=e.target||e.srcElement,t=o.tagName;return!("INPUT"===t||"SELECT"===t||"TEXTAREA"===t||o.isContentEditable)}function isPressed(e){return"string"==typeof e&&(e=code(e)),-1!==_downKeys.indexOf(e)}function deleteScope(e,o){var t=void 0,n=void 0;for(var r in e||(e=getScope()),_handlers)if(Object.prototype.hasOwnProperty.call(_handlers,r))for(t=_handlers[r],n=0;n<t.length;)t[n].scope===e?t.splice(n,1):n++;getScope()===e&&setScope(o||"all")}function clearModifier(e){var o=e.keyCode||e.which||e.charCode,t=_downKeys.indexOf(o);if(t<0||_downKeys.splice(t,1),93!==o&&224!==o||(o=91),o in _mods)for(var n in _mods[o]=!1,_modifier)_modifier[n]===o&&(hotkeys[n]=!1)}function unbind(e,o,t){var n=getKeys(e),r=void 0,s=[],i=void 0;"function"==typeof o&&(t=o,o="all");for(var d=0;d<n.length;d++){if(1<(r=n[d].split("+")).length&&(s=getMods(_modifier,r)),e="*"===(e=r[r.length-1])?"*":code(e),o||(o=getScope()),!_handlers[e])return;for(var a=0;a<_handlers[e].length;a++){if(i=_handlers[e][a],t&&i.method!==t)return;i.scope===o&&compareArray(i.mods,s)&&(_handlers[e][a]={})}}}function eventHandler(e,o,t){var n=void 0;if(o.scope===t||"all"===o.scope){for(var r in n=0<o.mods.length,_mods)Object.prototype.hasOwnProperty.call(_mods,r)&&(!_mods[r]&&-1<o.mods.indexOf(+r)||_mods[r]&&-1===o.mods.indexOf(+r))&&(n=!1);(0!==o.mods.length||_mods[16]||_mods[18]||_mods[17]||_mods[91])&&!n&&"*"!==o.shortcut||!1===o.method(e,o)&&(e.preventDefault?e.preventDefault():e.returnValue=!1,e.stopPropagation&&e.stopPropagation(),e.cancelBubble&&(e.cancelBubble=!0))}}function dispatch(e){var o=_handlers["*"],t=e.keyCode||e.which||e.charCode;if(-1===_downKeys.indexOf(t)&&_downKeys.push(t),93!==t&&224!==t||(t=91),t in _mods){for(var n in _mods[t]=!0,_modifier)_modifier[n]===t&&(hotkeys[n]=!0);if(!o)return}for(var r in _mods)Object.prototype.hasOwnProperty.call(_mods,r)&&(_mods[r]=e[modifierMap[r]]);if(hotkeys.filter.call(this,e)){var s=getScope();if(o)for(var i=0;i<o.length;i++)o[i].scope===s&&eventHandler(e,o[i],s);if(t in _handlers)for(var d=0;d<_handlers[t].length;d++)eventHandler(e,_handlers[t][d],s)}}function hotkeys(e,o,t){var n=getKeys(e),r=[],s="all",i=document,d=0;for(void 0===t&&"function"==typeof o&&(t=o),"[object Object]"===Object.prototype.toString.call(o)&&(o.scope&&(s=o.scope),o.element&&(i=o.element)),"string"==typeof o&&(s=o);d<n.length;d++)r=[],1<(e=n[d].split("+")).length&&(r=getMods(_modifier,e)),(e="*"===(e=e[e.length-1])?"*":code(e))in _handlers||(_handlers[e]=[]),_handlers[e].push({scope:s,mods:r,shortcut:n[d],method:t,key:n[d]});void 0===i||isBindElement||(isBindElement=!0,addEvent(i,"keydown",function(e){dispatch(e)}),addEvent(i,"keyup",function(e){clearModifier(e)}))}var _api={setScope:setScope,getScope:getScope,deleteScope:deleteScope,getPressedKeyCodes:getPressedKeyCodes,isPressed:isPressed,filter:filter,unbind:unbind};for(var a in _api)Object.prototype.hasOwnProperty.call(_api,a)&&(hotkeys[a]=_api[a]);if("undefined"!=typeof window){var _hotkeys=window.hotkeys;hotkeys.noConflict=function(e){return e&&window.hotkeys===hotkeys&&(window.hotkeys=_hotkeys),hotkeys},window.hotkeys=hotkeys}module.exports=hotkeys;
\ No newline at end of file
diff --git a/dist/hotkeys.esm.js b/dist/hotkeys.esm.js
index 7fb504c..7ba9543 100644
--- a/dist/hotkeys.esm.js
+++ b/dist/hotkeys.esm.js
@@ -1,5 +1,5 @@
 /*!
- * hotkeys-js v3.4.0
+ * hotkeys-js v3.4.1
  * A simple micro-library for defining and dispatching keyboard shortcuts. It has no dependencies.
  * 
  * Copyright (c) 2018 kenny wong <wowohoo@qq.com>
diff --git a/dist/hotkeys.js b/dist/hotkeys.js
index 7ca6a6a..6c25781 100644
--- a/dist/hotkeys.js
+++ b/dist/hotkeys.js
@@ -1,5 +1,5 @@
 /*!
- * hotkeys-js v3.4.0
+ * hotkeys-js v3.4.1
  * A simple micro-library for defining and dispatching keyboard shortcuts. It has no dependencies.
  * 
  * Copyright (c) 2018 kenny wong <wowohoo@qq.com>
diff --git a/dist/hotkeys.min.js b/dist/hotkeys.min.js
index 321d79d..eb646ed 100644
--- a/dist/hotkeys.min.js
+++ b/dist/hotkeys.min.js
@@ -1,2 +1,2 @@
-/*! hotkeys-js v3.4.0 | MIT (c) 2018 kenny wong <wowohoo@qq.com> | http://jaywcjlove.github.io/hotkeys */
+/*! hotkeys-js v3.4.1 | MIT (c) 2018 kenny wong <wowohoo@qq.com> | http://jaywcjlove.github.io/hotkeys */
 !function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):e.hotkeys=t()}(this,function(){"use strict";var e="undefined"!=typeof navigator&&0<navigator.userAgent.toLowerCase().indexOf("firefox");function c(e,t,n){e.addEventListener?e.addEventListener(t,n,!1):e.attachEvent&&e.attachEvent("on"+t,function(){n(window.event)})}function l(e,t){for(var n=t.slice(0,t.length-1),o=0;o<n.length;o++)n[o]=e[n[o].toLowerCase()];return n}function s(e){e||(e="");for(var t=(e=e.replace(/\s/g,"")).split(","),n=t.lastIndexOf("");0<=n;)t[n-1]+=",",t.splice(n,1),n=t.lastIndexOf("");return t}function d(e,t){for(var n=e.length<t.length?t:e,o=e.length<t.length?e:t,r=!0,i=0;i<n.length;i++)-1===o.indexOf(n[i])&&(r=!1);return r}for(var t={backspace:8,tab:9,clear:12,enter:13,return:13,esc:27,escape:27,space:32,left:37,up:38,right:39,down:40,del:46,delete:46,ins:45,insert:45,home:36,end:35,pageup:33,pagedown:34,capslock:20,"\u21ea":20,",":188,".":190,"/":191,"`":192,"-":e?173:189,"=":e?61:187,";":e?59:186,"'":222,"[":219,"]":221,"\\":220},p={"\u21e7":16,shift:16,"\u2325":18,alt:18,option:18,"\u2303":17,ctrl:17,control:17,"\u2318":e?224:91,cmd:e?224:91,command:e?224:91},u=[],h={16:"shiftKey",18:"altKey",17:"ctrlKey"},v={16:!1,18:!1,17:!1},g={},n=1;n<20;n++)t["f"+n]=111+n;var o="all",y=v[e?224:91]=!(h[e?224:91]="metaKey"),w=function(e){return t[e.toLowerCase()]||p[e.toLowerCase()]||e.toUpperCase().charCodeAt(0)};function i(e){o=e||"all"}function m(){return o||"all"}function O(e,t,n){var o=void 0;if(t.scope===n||"all"===t.scope){for(var r in o=0<t.mods.length,v)Object.prototype.hasOwnProperty.call(v,r)&&(!v[r]&&-1<t.mods.indexOf(+r)||v[r]&&-1===t.mods.indexOf(+r))&&(o=!1);(0!==t.mods.length||v[16]||v[18]||v[17]||v[91])&&!o&&"*"!==t.shortcut||!1===t.method(e,t)&&(e.preventDefault?e.preventDefault():e.returnValue=!1,e.stopPropagation&&e.stopPropagation(),e.cancelBubble&&(e.cancelBubble=!0))}}function b(e,t,n){var o=s(e),r=[],i="all",a=document,f=0;for(void 0===n&&"function"==typeof t&&(n=t),"[object Object]"===Object.prototype.toString.call(t)&&(t.scope&&(i=t.scope),t.element&&(a=t.element)),"string"==typeof t&&(i=t);f<o.length;f++)r=[],1<(e=o[f].split("+")).length&&(r=l(p,e)),(e="*"===(e=e[e.length-1])?"*":w(e))in g||(g[e]=[]),g[e].push({scope:i,mods:r,shortcut:o[f],method:n,key:o[f]});void 0===a||y||(y=!0,c(a,"keydown",function(e){!function(e){var t=g["*"],n=e.keyCode||e.which||e.charCode;if(-1===u.indexOf(n)&&u.push(n),93!==n&&224!==n||(n=91),n in v){for(var o in v[n]=!0,p)p[o]===n&&(b[o]=!0);if(!t)return}for(var r in v)Object.prototype.hasOwnProperty.call(v,r)&&(v[r]=e[h[r]]);if(b.filter.call(this,e)){var i=m();if(t)for(var a=0;a<t.length;a++)t[a].scope===i&&O(e,t[a],i);if(n in g)for(var f=0;f<g[n].length;f++)O(e,g[n][f],i)}}(e)}),c(a,"keyup",function(e){!function(e){var t=e.keyCode||e.which||e.charCode,n=u.indexOf(t);if(n<0||u.splice(n,1),93!==t&&224!==t||(t=91),t in v)for(var o in v[t]=!1,p)p[o]===t&&(b[o]=!1)}(e)}))}var r={setScope:i,getScope:m,deleteScope:function(e,t){var n=void 0,o=void 0;for(var r in e||(e=m()),g)if(Object.prototype.hasOwnProperty.call(g,r))for(n=g[r],o=0;o<n.length;)n[o].scope===e?n.splice(o,1):o++;m()===e&&i(t||"all")},getPressedKeyCodes:function(){return u.slice(0)},isPressed:function(e){return"string"==typeof e&&(e=w(e)),-1!==u.indexOf(e)},filter:function(e){var t=e.target||e.srcElement,n=t.tagName;return!("INPUT"===n||"SELECT"===n||"TEXTAREA"===n||t.isContentEditable)},unbind:function(e,t,n){var o=s(e),r=void 0,i=[],a=void 0;"function"==typeof t&&(n=t,t="all");for(var f=0;f<o.length;f++){if(1<(r=o[f].split("+")).length&&(i=l(p,r)),e="*"===(e=r[r.length-1])?"*":w(e),t||(t=m()),!g[e])return;for(var c=0;c<g[e].length;c++){if(a=g[e][c],n&&a.method!==n)return;a.scope===t&&d(a.mods,i)&&(g[e][c]={})}}}};for(var a in r)Object.prototype.hasOwnProperty.call(r,a)&&(b[a]=r[a]);if("undefined"!=typeof window){var f=window.hotkeys;b.noConflict=function(e){return e&&window.hotkeys===b&&(window.hotkeys=f),b},window.hotkeys=b}return b});
\ No newline at end of file
diff --git a/package.json b/package.json
index c98e7b9..b52f3b6 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "hotkeys-js",
   "description": "A simple micro-library for defining and dispatching keyboard shortcuts. It has no dependencies.",
-  "version": "3.4.0",
+  "version": "3.4.1",
   "main": "index.js",
   "module": "dist/hotkeys.esm.js",
   "scripts": {