From b9cde08e0ef5f41a9b12821165c278c2944599ab Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=9C=88=E8=BF=B7=E6=B4=A5=E6=B8=A1?= <CodeDaraW@gmail.com>
Date: Sat, 18 May 2019 20:03:02 +0800
Subject: [PATCH] fix: unbind keys issue (#82)

---
 dist/hotkeys.common.js     | 7 ++++++-
 dist/hotkeys.common.min.js | 2 +-
 dist/hotkeys.esm.js        | 7 ++++++-
 dist/hotkeys.js            | 7 ++++++-
 dist/hotkeys.min.js        | 2 +-
 src/main.js                | 6 +++++-
 6 files changed, 25 insertions(+), 6 deletions(-)

diff --git a/dist/hotkeys.common.js b/dist/hotkeys.common.js
index 43945dc..117a542 100644
--- a/dist/hotkeys.common.js
+++ b/dist/hotkeys.common.js
@@ -249,7 +249,12 @@ function unbind(key, scope, method) {
     // 将组合快捷键拆分为数组
     keys = multipleKeys[i].split('+'); // 记录每个组合键中的修饰键的键码 返回数组
 
-    if (keys.length > 1) mods = getMods(_modifier, keys); // 获取除修饰键外的键值key
+    if (keys.length > 1) {
+      mods = getMods(_modifier, keys);
+    } else {
+      mods = [];
+    } // 获取除修饰键外的键值key
+
 
     key = keys[keys.length - 1];
     key = key === '*' ? '*' : code(key); // 判断是否传入范围，没有就获取范围
diff --git a/dist/hotkeys.common.min.js b/dist/hotkeys.common.min.js
index d1f6ec9..dee1a20 100644
--- a/dist/hotkeys.common.min.js
+++ b/dist/hotkeys.common.min.js
@@ -1,2 +1,2 @@
 /*! hotkeys-js v3.6.8 | MIT (c) 2019 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".concat(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++)~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".concat(k)]=111+k;_mods[isff?224:91]=!(modifierMap[isff?224:91]="metaKey");var _scope="all",elementHasBindEvent=[],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,n=!0;return!o.isContentEditable&&"TEXTAREA"!==t&&("INPUT"!==t&&"TEXTAREA"!==t||o.readOnly)||(n=!1),n}function isPressed(e){return"string"==typeof e&&(e=code(e)),!!~_downKeys.indexOf(e)}function deleteScope(e,o){var t,n;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),e.key&&"meta"==e.key.toLowerCase()&&_downKeys.splice(0,_downKeys.length),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,r,s=getKeys(e),d=[];"function"==typeof o&&(t=o,o="all");for(var i=0;i<s.length;i++){if(1<(n=s[i].split("+")).length&&(d=getMods(_modifier,n)),e="*"===(e=n[n.length-1])?"*":code(e),o||(o=getScope()),!_handlers[e])return;for(var a=0;a<_handlers[e].length;a++){r=_handlers[e][a],t&&r.method!==t||r.scope!==o||!compareArray(r.mods,d)||(_handlers[e][a]={})}}}function eventHandler(e,o,t){var n;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]&&!~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(hotkeys.filter.call(this,e)){if(~_downKeys.indexOf(t)||229===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]]);var s=getScope();if(o)for(var d=0;d<o.length;d++)o[d].scope===s&&("keydown"===e.type&&o[d].keydown||"keyup"===e.type&&o[d].keyup)&&eventHandler(e,o[d],s);if(t in _handlers)for(var i=0;i<_handlers[t].length;i++)if(("keydown"===e.type&&_handlers[t][i].keydown||"keyup"===e.type&&_handlers[t][i].keyup)&&_handlers[t][i].key){for(var a=_handlers[t][i].key.split("+"),l=[],c=0;c<a.length;c++)l.push(code(a[c]));(l=l.sort()).join("")===_downKeys.sort().join("")&&eventHandler(e,_handlers[t][i],s)}}}function isElementBind(e){return-1<elementHasBindEvent.indexOf(e)}function hotkeys(e,o,t){var n=getKeys(e),r=[],s="all",d=document,i=0,a=!1,l=!0;for(void 0===t&&"function"==typeof o&&(t=o),"[object Object]"===Object.prototype.toString.call(o)&&(o.scope&&(s=o.scope),o.element&&(d=o.element),o.keyup&&(a=o.keyup),o.keydown&&(l=o.keydown)),"string"==typeof o&&(s=o);i<n.length;i++)r=[],1<(e=n[i].split("+")).length&&(r=getMods(_modifier,e)),(e="*"===(e=e[e.length-1])?"*":code(e))in _handlers||(_handlers[e]=[]),_handlers[e].push({keyup:a,keydown:l,scope:s,mods:r,shortcut:n[i],method:t,key:n[i]});void 0===d||isElementBind(d)||(elementHasBindEvent.push(d),addEvent(d,"keydown",function(e){dispatch(e)}),addEvent(d,"keyup",function(e){dispatch(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
+"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".concat(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++)~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".concat(k)]=111+k;_mods[isff?224:91]=!(modifierMap[isff?224:91]="metaKey");var _scope="all",elementHasBindEvent=[],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,n=!0;return!o.isContentEditable&&"TEXTAREA"!==t&&("INPUT"!==t&&"TEXTAREA"!==t||o.readOnly)||(n=!1),n}function isPressed(e){return"string"==typeof e&&(e=code(e)),!!~_downKeys.indexOf(e)}function deleteScope(e,o){var t,n;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),e.key&&"meta"==e.key.toLowerCase()&&_downKeys.splice(0,_downKeys.length),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,r,s=getKeys(e),d=[];"function"==typeof o&&(t=o,o="all");for(var i=0;i<s.length;i++){if(d=1<(n=s[i].split("+")).length?getMods(_modifier,n):[],e="*"===(e=n[n.length-1])?"*":code(e),o||(o=getScope()),!_handlers[e])return;for(var a=0;a<_handlers[e].length;a++){r=_handlers[e][a],t&&r.method!==t||r.scope!==o||!compareArray(r.mods,d)||(_handlers[e][a]={})}}}function eventHandler(e,o,t){var n;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]&&!~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(hotkeys.filter.call(this,e)){if(~_downKeys.indexOf(t)||229===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]]);var s=getScope();if(o)for(var d=0;d<o.length;d++)o[d].scope===s&&("keydown"===e.type&&o[d].keydown||"keyup"===e.type&&o[d].keyup)&&eventHandler(e,o[d],s);if(t in _handlers)for(var i=0;i<_handlers[t].length;i++)if(("keydown"===e.type&&_handlers[t][i].keydown||"keyup"===e.type&&_handlers[t][i].keyup)&&_handlers[t][i].key){for(var a=_handlers[t][i].key.split("+"),l=[],c=0;c<a.length;c++)l.push(code(a[c]));(l=l.sort()).join("")===_downKeys.sort().join("")&&eventHandler(e,_handlers[t][i],s)}}}function isElementBind(e){return-1<elementHasBindEvent.indexOf(e)}function hotkeys(e,o,t){var n=getKeys(e),r=[],s="all",d=document,i=0,a=!1,l=!0;for(void 0===t&&"function"==typeof o&&(t=o),"[object Object]"===Object.prototype.toString.call(o)&&(o.scope&&(s=o.scope),o.element&&(d=o.element),o.keyup&&(a=o.keyup),o.keydown&&(l=o.keydown)),"string"==typeof o&&(s=o);i<n.length;i++)r=[],1<(e=n[i].split("+")).length&&(r=getMods(_modifier,e)),(e="*"===(e=e[e.length-1])?"*":code(e))in _handlers||(_handlers[e]=[]),_handlers[e].push({keyup:a,keydown:l,scope:s,mods:r,shortcut:n[i],method:t,key:n[i]});void 0===d||isElementBind(d)||(elementHasBindEvent.push(d),addEvent(d,"keydown",function(e){dispatch(e)}),addEvent(d,"keyup",function(e){dispatch(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 f041b97..bc691a9 100644
--- a/dist/hotkeys.esm.js
+++ b/dist/hotkeys.esm.js
@@ -247,7 +247,12 @@ function unbind(key, scope, method) {
     // 将组合快捷键拆分为数组
     keys = multipleKeys[i].split('+'); // 记录每个组合键中的修饰键的键码 返回数组
 
-    if (keys.length > 1) mods = getMods(_modifier, keys); // 获取除修饰键外的键值key
+    if (keys.length > 1) {
+      mods = getMods(_modifier, keys);
+    } else {
+      mods = [];
+    } // 获取除修饰键外的键值key
+
 
     key = keys[keys.length - 1];
     key = key === '*' ? '*' : code(key); // 判断是否传入范围，没有就获取范围
diff --git a/dist/hotkeys.js b/dist/hotkeys.js
index f11bbdf..6d091e9 100644
--- a/dist/hotkeys.js
+++ b/dist/hotkeys.js
@@ -253,7 +253,12 @@
       // 将组合快捷键拆分为数组
       keys = multipleKeys[i].split('+'); // 记录每个组合键中的修饰键的键码 返回数组
 
-      if (keys.length > 1) mods = getMods(_modifier, keys); // 获取除修饰键外的键值key
+      if (keys.length > 1) {
+        mods = getMods(_modifier, keys);
+      } else {
+        mods = [];
+      } // 获取除修饰键外的键值key
+
 
       key = keys[keys.length - 1];
       key = key === '*' ? '*' : code(key); // 判断是否传入范围，没有就获取范围
diff --git a/dist/hotkeys.min.js b/dist/hotkeys.min.js
index 6750fe7..ac0f51c 100644
--- a/dist/hotkeys.min.js
+++ b/dist/hotkeys.min.js
@@ -1,2 +1,2 @@
 /*! hotkeys-js v3.6.8 | MIT (c) 2019 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=e||self).hotkeys=t()}(this,function(){"use strict";var e="undefined"!=typeof navigator&&0<navigator.userAgent.toLowerCase().indexOf("firefox");function s(e,t,n){e.addEventListener?e.addEventListener(t,n,!1):e.attachEvent&&e.attachEvent("on".concat(t),function(){n(window.event)})}function p(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 d(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 l(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++)~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},u={"\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},y=[],h={16:"shiftKey",18:"altKey",17:"ctrlKey"},v={16:!1,18:!1,17:!1},g={},n=1;n<20;n++)t["f".concat(n)]=111+n;v[e?224:91]=!(h[e?224:91]="metaKey");var o="all",w=[],k=function(e){return t[e.toLowerCase()]||u[e.toLowerCase()]||e.toUpperCase().charCodeAt(0)};function i(e){o=e||"all"}function m(){return o||"all"}function O(e,t,n){var o;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]&&!~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){var t=g["*"],n=e.keyCode||e.which||e.charCode;if(C.filter.call(this,e)){if(~y.indexOf(n)||229===n||y.push(n),93!==n&&224!==n||(n=91),n in v){for(var o in v[n]=!0,u)u[o]===n&&(C[o]=!0);if(!t)return}for(var r in v)Object.prototype.hasOwnProperty.call(v,r)&&(v[r]=e[h[r]]);var i=m();if(t)for(var a=0;a<t.length;a++)t[a].scope===i&&("keydown"===e.type&&t[a].keydown||"keyup"===e.type&&t[a].keyup)&&O(e,t[a],i);if(n in g)for(var c=0;c<g[n].length;c++)if(("keydown"===e.type&&g[n][c].keydown||"keyup"===e.type&&g[n][c].keyup)&&g[n][c].key){for(var f=g[n][c].key.split("+"),l=[],s=0;s<f.length;s++)l.push(k(f[s]));(l=l.sort()).join("")===y.sort().join("")&&O(e,g[n][c],i)}}}function C(e,t,n){var o=d(e),r=[],i="all",a=document,c=0,f=!1,l=!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),t.keyup&&(f=t.keyup),t.keydown&&(l=t.keydown)),"string"==typeof t&&(i=t);c<o.length;c++)r=[],1<(e=o[c].split("+")).length&&(r=p(u,e)),(e="*"===(e=e[e.length-1])?"*":k(e))in g||(g[e]=[]),g[e].push({keyup:f,keydown:l,scope:i,mods:r,shortcut:o[c],method:n,key:o[c]});void 0===a||function(e){return-1<w.indexOf(e)}(a)||(w.push(a),s(a,"keydown",function(e){b(e)}),s(a,"keyup",function(e){b(e),function(e){var t=e.keyCode||e.which||e.charCode,n=y.indexOf(t);if(n<0||y.splice(n,1),e.key&&"meta"==e.key.toLowerCase()&&y.splice(0,y.length),93!==t&&224!==t||(t=91),t in v)for(var o in v[t]=!1,u)u[o]===t&&(C[o]=!1)}(e)}))}var r={setScope:i,getScope:m,deleteScope:function(e,t){var n,o;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 y.slice(0)},isPressed:function(e){return"string"==typeof e&&(e=k(e)),!!~y.indexOf(e)},filter:function(e){var t=e.target||e.srcElement,n=t.tagName,o=!0;return!t.isContentEditable&&"TEXTAREA"!==n&&("INPUT"!==n&&"TEXTAREA"!==n||t.readOnly)||(o=!1),o},unbind:function(e,t,n){var o,r,i=d(e),a=[];"function"==typeof t&&(n=t,t="all");for(var c=0;c<i.length;c++){if(1<(o=i[c].split("+")).length&&(a=p(u,o)),e="*"===(e=o[o.length-1])?"*":k(e),t||(t=m()),!g[e])return;for(var f=0;f<g[e].length;f++)r=g[e][f],n&&r.method!==n||r.scope!==t||!l(r.mods,a)||(g[e][f]={})}}};for(var a in r)Object.prototype.hasOwnProperty.call(r,a)&&(C[a]=r[a]);if("undefined"!=typeof window){var c=window.hotkeys;C.noConflict=function(e){return e&&window.hotkeys===C&&(window.hotkeys=c),C},window.hotkeys=C}return C});
\ No newline at end of file
+!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e=e||self).hotkeys=t()}(this,function(){"use strict";var e="undefined"!=typeof navigator&&0<navigator.userAgent.toLowerCase().indexOf("firefox");function s(e,t,n){e.addEventListener?e.addEventListener(t,n,!1):e.attachEvent&&e.attachEvent("on".concat(t),function(){n(window.event)})}function p(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 d(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 l(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++)~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},u={"\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},y=[],h={16:"shiftKey",18:"altKey",17:"ctrlKey"},v={16:!1,18:!1,17:!1},g={},n=1;n<20;n++)t["f".concat(n)]=111+n;v[e?224:91]=!(h[e?224:91]="metaKey");var o="all",w=[],k=function(e){return t[e.toLowerCase()]||u[e.toLowerCase()]||e.toUpperCase().charCodeAt(0)};function i(e){o=e||"all"}function m(){return o||"all"}function O(e,t,n){var o;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]&&!~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){var t=g["*"],n=e.keyCode||e.which||e.charCode;if(C.filter.call(this,e)){if(~y.indexOf(n)||229===n||y.push(n),93!==n&&224!==n||(n=91),n in v){for(var o in v[n]=!0,u)u[o]===n&&(C[o]=!0);if(!t)return}for(var r in v)Object.prototype.hasOwnProperty.call(v,r)&&(v[r]=e[h[r]]);var i=m();if(t)for(var a=0;a<t.length;a++)t[a].scope===i&&("keydown"===e.type&&t[a].keydown||"keyup"===e.type&&t[a].keyup)&&O(e,t[a],i);if(n in g)for(var c=0;c<g[n].length;c++)if(("keydown"===e.type&&g[n][c].keydown||"keyup"===e.type&&g[n][c].keyup)&&g[n][c].key){for(var f=g[n][c].key.split("+"),l=[],s=0;s<f.length;s++)l.push(k(f[s]));(l=l.sort()).join("")===y.sort().join("")&&O(e,g[n][c],i)}}}function C(e,t,n){var o=d(e),r=[],i="all",a=document,c=0,f=!1,l=!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),t.keyup&&(f=t.keyup),t.keydown&&(l=t.keydown)),"string"==typeof t&&(i=t);c<o.length;c++)r=[],1<(e=o[c].split("+")).length&&(r=p(u,e)),(e="*"===(e=e[e.length-1])?"*":k(e))in g||(g[e]=[]),g[e].push({keyup:f,keydown:l,scope:i,mods:r,shortcut:o[c],method:n,key:o[c]});void 0===a||function(e){return-1<w.indexOf(e)}(a)||(w.push(a),s(a,"keydown",function(e){b(e)}),s(a,"keyup",function(e){b(e),function(e){var t=e.keyCode||e.which||e.charCode,n=y.indexOf(t);if(n<0||y.splice(n,1),e.key&&"meta"==e.key.toLowerCase()&&y.splice(0,y.length),93!==t&&224!==t||(t=91),t in v)for(var o in v[t]=!1,u)u[o]===t&&(C[o]=!1)}(e)}))}var r={setScope:i,getScope:m,deleteScope:function(e,t){var n,o;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 y.slice(0)},isPressed:function(e){return"string"==typeof e&&(e=k(e)),!!~y.indexOf(e)},filter:function(e){var t=e.target||e.srcElement,n=t.tagName,o=!0;return!t.isContentEditable&&"TEXTAREA"!==n&&("INPUT"!==n&&"TEXTAREA"!==n||t.readOnly)||(o=!1),o},unbind:function(e,t,n){var o,r,i=d(e),a=[];"function"==typeof t&&(n=t,t="all");for(var c=0;c<i.length;c++){if(a=1<(o=i[c].split("+")).length?p(u,o):[],e="*"===(e=o[o.length-1])?"*":k(e),t||(t=m()),!g[e])return;for(var f=0;f<g[e].length;f++)r=g[e][f],n&&r.method!==n||r.scope!==t||!l(r.mods,a)||(g[e][f]={})}}};for(var a in r)Object.prototype.hasOwnProperty.call(r,a)&&(C[a]=r[a]);if("undefined"!=typeof window){var c=window.hotkeys;C.noConflict=function(e){return e&&window.hotkeys===C&&(window.hotkeys=c),C},window.hotkeys=C}return C});
\ No newline at end of file
diff --git a/src/main.js b/src/main.js
index 5ad4259..9a0718d 100644
--- a/src/main.js
+++ b/src/main.js
@@ -105,7 +105,11 @@ function unbind(key, scope, method) {
     keys = multipleKeys[i].split('+');
 
     // 记录每个组合键中的修饰键的键码 返回数组
-    if (keys.length > 1) mods = getMods(_modifier, keys);
+    if (keys.length > 1) {
+      mods = getMods(_modifier, keys);
+    } else {
+      mods = [];
+    }
 
     // 获取除修饰键外的键值key
     key = keys[keys.length - 1];