網友提供了一個好用的快捷鍵庫,沒有任何依賴,這是一個強健的 Javascript 庫用於捕獲鍵盤輸入和輸入的組合鍵,它沒有依賴,壓縮只有只有(~3kb)。javascript
這裏也要特別感謝園友kacper的提醒與提供參考。html
下面我把源碼貼出來,僅供本身和你們學習參考。java
下面給出hotkeys.js文件內容:api
//IE對indexOf方法的支持 if(!Array.indexOf){ Array.prototype.indexOf = function(obj){ for(var i=0; i<this.length; i++) if(this[i]===obj) return i; return -1; }; } ;(function(root, factory) { var hotkeys = factory(root); if (typeof define === 'function' && define.amd) { // AMD define('hotkeys', function() { return hotkeys; }); } else if (typeof exports === 'object') { // Node.js module.exports = hotkeys; } else { // Browser globals // previousKey存儲先前定義的關鍵字 var previousKey = root.hotkeys; hotkeys.noConflict = function() { var k = root.hotkeys; root.hotkeys = previousKey; return k; }; root.hotkeys = hotkeys; } }(this, function(root, undefined) { var _api,//對外API _keyMap = {//特殊鍵 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, home: 36, end: 35, pageup: 33, pagedown: 34, ',': 188, '.': 190, '/': 191, '`': 192, '-': 189, '=': 187, ';': 186, '\'': 222, '[': 219, ']': 221, '\\': 220 }, _scope = 'all',//默認熱鍵範圍 _modifier = {//修飾鍵 '⇧': 16, shift: 16, '⌥': 18, alt: 18, option: 18, '⌃': 17, ctrl: 17, control: 17, '⌘': 91, command: 91 }, _downKeys=[],//記錄摁下的綁定鍵 modifierMap = { 16:'shiftKey', 18:'altKey', 17:'ctrlKey', 91:'metaKey' }, _mods = { 16: false, 18: false, 17: false, 91: false }, //返回鍵碼 code = function(x){ console.log(); return _keyMap[x] || x.toUpperCase().charCodeAt(0); }, _handlers={}; // F1~F12 特殊鍵 for(k=1;k<20;k++) { _keyMap['f'+k] = 111+k; } //設置獲取當前範圍(默認爲'全部') function setScope(scope){ _scope = scope || 'all';} function getScope(){ return _scope || 'all';} //綁定事件 function addEvent(object, event, method) { if (object.addEventListener){ object.addEventListener(event, method, false); }else if(object.attachEvent){ object.attachEvent('on'+event, function(){ method(window.event); }); } } //判斷摁下的鍵是否爲某個鍵,返回true或者false function isPressed(keyCode) { if(typeof(keyCode) === 'string'){ keyCode = code(keyCode);//轉換成鍵碼 } return _downKeys.indexOf(keyCode) !==-1; } //獲取摁下綁定鍵的鍵值 function getPressedKeyCodes (argument) { return _downKeys.slice(0);} //處理keydown事件 function dispatch (event) { var key = event.keyCode,scope,asterisk = _handlers['*']; //蒐集綁定的鍵 if(_downKeys.indexOf(key)===-1) _downKeys.push(key); //Gecko(Friefox)的command鍵值224,在Webkit(Chrome)中保持一致 //Webkit左右command鍵值不同 if(key === 93 || key === 224) key = 91; if(key in _mods) { _mods[key] = true; // 將特殊字符的key註冊到 hotkeys 上 for(var k in _modifier)if(_modifier[k] === key) hotkeys[k] = true; if(!asterisk) return; } //將modifierMap裏面的修飾鍵綁定到event中 for(var e in _mods) _mods[e] = event[modifierMap[e]]; //表單控件控件過濾 默認表單控件不觸發快捷鍵 if(!hotkeys.filter.call(this,event)) return; //獲取範圍 默認爲all scope = getScope(); //對任何按鍵作處理 if(asterisk) for (i = 0; i < asterisk.length; i++) { if(asterisk[i].scope === scope) eventHandler(event,asterisk[i],scope); } // key 不在_handlers中返回 if (!(key in _handlers)) return; for (i = 0; i < _handlers[key].length; i++) { //找處處理內容 eventHandler(event,_handlers[key][i],scope); } } function eventHandler(event,handler,scope){ var modifiersMatch; //看它是否在當前範圍 if(handler.scope === scope || handler.scope === 'all'){ //檢查是否匹配修飾符(若是有返回true) modifiersMatch = handler.mods.length > 0; for(var y in _mods){ if((!_mods[y] && handler.mods.indexOf(+y) > -1) || (_mods[y] && handler.mods.indexOf(+y) === -1)) modifiersMatch = false; } // 調用處理程序,若是是修飾鍵不作處理 if((handler.mods.length === 0 && !_mods[16] && !_mods[18] && !_mods[17] && !_mods[91]) || modifiersMatch || handler.shortcut === '*'){ if(handler.method(event, handler)===false){ if(event.preventDefault) event.preventDefault(); else event.returnValue = false; if(event.stopPropagation) event.stopPropagation(); if(event.cancelBubble) event.cancelBubble = true; } } } } //解除綁定某個範圍的快捷鍵 function unbind (key,scope) { var multipleKeys = getKeys(key),keys,mods = [],obj; for (var i = 0; i < multipleKeys.length; i++) { //將組合快捷鍵拆分爲數組 keys =multipleKeys[i].split('+'); //記錄每一個組合鍵中的修飾鍵的鍵碼 返回數組 if(keys.length > 1) mods=getMods(keys); //獲取除修飾鍵外的鍵值key key = keys[keys.length - 1]; key = code(key); //判斷是否傳入範圍,沒有就獲取範圍 if(scope === undefined) scope = getScope(); //如何key不在 _handlers 中返回不作處理 if (!_handlers[key]) return; //清空 handlers 中數據, //讓觸發快捷鍵鍵以後沒有事件執行到達解除快捷鍵綁定的目的 for (var r = 0; r < _handlers[key].length; r++) { obj = _handlers[key][r]; //判斷是否在範圍內而且鍵值相同 if (obj.scope === scope && compareArray(obj.mods, mods)) { _handlers[key][r] = {}; } } } } //循環刪除handlers中的全部 scope(範圍) function deleteScope(scope){ var key, handlers, i; for (key in _handlers) { handlers = _handlers[key]; for (i = 0; i < handlers.length; ) { if (handlers[i].scope === scope) handlers.splice(i, 1); else i++; } } } //比較修飾鍵的數組 function compareArray(a1, a2) { if (a1.length !== a2.length) return false; for (var i = 0; i < a1.length; i++) { if (a1[i] !== a2[i]) return false; } return true; } //表單控件控件判斷 返回 Boolean function filter(event){ var tagName = (event.target || event.srcElement).tagName; //忽略這些標籤狀況下快捷鍵無效 return !(tagName === 'INPUT' || tagName === 'SELECT' || tagName === 'TEXTAREA'); } //修飾鍵轉換成對應的鍵碼 function getMods (key) { var mods = key.slice(0, key.length - 1); for (var i = 0; i < mods.length; i++) mods[i] = _modifier[mods[i]]; return mods; } //處理傳的key字符串轉換成數組 function getKeys(key) { var keys; key = key.replace(/\s/g, '');//匹配任何空白字符,包括空格、製表符、換頁符等等 keys = key.split(','); if ((keys[keys.length - 1]) === '') keys[keys.length - 2] += ','; return keys; } //在全局document上設置快捷鍵 addEvent(document, 'keydown', function(event) { dispatch(event); }); addEvent(document, 'keyup',function(event){ clearModifier(event); }); //清除修飾鍵 function clearModifier(event){ var key = event.keyCode, i = _downKeys.indexOf(key); if(i>=0) _downKeys.splice(i,1); //修飾鍵 shiftKey altKey ctrlKey (command||metaKey) 清除 if(key === 93 || key === 224) key = 91; if(key in _mods) { _mods[key] = false; for(var k in _modifier) if(_modifier[k] === key) hotkeys[k] = false; } } //主體hotkeys函數 function hotkeys(key,scope,method){ var keys = getKeys(key), mods=[],i=0; //對爲設定範圍的判斷 if (method === undefined) { method = scope; scope = 'all'; } //對於每一個快捷鍵處理 for(;i < keys.length; i++){ key = keys[i].split('+'); mods = []; //若是是組合快捷鍵取得組合快捷鍵 if (key.length > 1){ mods = getMods(key); key = [key[key.length-1]]; } //轉換成鍵碼 key = key[0]; key = key === '*' ? '*' : code(key); //判斷key是否在_handlers中,不在就賦一個空數組 if (!(key in _handlers)) _handlers[key] = []; _handlers[key].push({shortcut: keys[i], scope: scope, method: method, key: keys[i], mods: mods}); } } _api = { setScope:setScope, getScope:getScope, deleteScope:deleteScope, getPressedKeyCodes:getPressedKeyCodes, isPressed:isPressed, filter:filter, unbind:unbind }; for (var a in _api) hotkeys[a] = _api[a]; return hotkeys; }));
而後就能夠在您的HTML頁面上進行引用了,以下的test.html頁面:數組
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>hotkeys</title> <script type="text/javascript" src="../src/hotkeys.js"></script> </head> <body> <div style="height: 60px;width: 600px;border: 1px solid red;">按alt+c鍵會在console中輸出信息,分別把光標定位在body中、div中、textarea中 而後再按alt+c分別會激發不一樣的開關,可使用alt+o和o兩種鍵組合,分別執行不一樣的功能,本例是都在console中輸出信息。</div> <br /> <textarea></textarea> <div id=ddd contentEditable="true" style="height: 100px;width: 400px;border: 1px solid red;"></div> <script type="text/javascript"> hotkeys.filter = function(event){ //console.log("message123123123",event.target); return true; } // 定義a快捷鍵 hotkeys('alt+c',function(event,handler){ //event.srcElement: input //event.target: input console.log("message22323:",event.target); // 設定範圍scope if(event.target.tagName=="TEXTAREA") hotkeys.setScope('issues'); if(event.target.tagName=="DIV") hotkeys.setScope('files'); }); // 一個快捷鍵,有可能幹的活兒不同哦 hotkeys('alt+o, ctrl+alt+enter', 'issues', function(){ console.log('乾點活兒'); }); hotkeys('o, enter', 'files', function(){ console.log('另外一種活兒'); }); </script> </body> </html>
以上代碼我已經打包,你能夠下載使用,下載地址:hotkeys-jaywcjlove-4e99489函數
另外,你也能夠到hotkeys的官方網站上下載最新的JS庫代碼以及使用手冊說明,網址:http://jslite.io/hotkeys/學習
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