[tsigel]

Я как то себе писал, можете под себя доработать. Вообще таких штук много.

<script>
var KeyBoard = (function () {
        function KeyBoard() {
            this.activeKeys = [];
            this.events = {};
            this.onKeyDown = this.onKeyDown.bind(this);
            this.onKeyUp = this.onKeyUp.bind(this);
            this.dropKeys = this.dropKeys.bind(this);
            this.initialize();
        }
        KeyBoard.prototype.on = function (command, handler, context) {
            var keys = KeyBoard.getKeys(command);
            var eventName = KeyBoard.getEventName(keys);
            if (!this.hasEvent(eventName)) {
                this.events[eventName] = [];
            }
            this.events[eventName].push({
                originCommand: command,
                eventName: eventName,
                handler: handler,
                context: context || window,
                keys: keys
            });
            return this;
        };
        KeyBoard.prototype.off = function (command, handler) {
            if (!command) {
                this.events = {};
                return this;
            }
            if (!handler) {
                delete this.events[KeyBoard.getEventName(KeyBoard.getKeys(command))];
                return this;
            }
            var eventName = KeyBoard.getEventName(KeyBoard.getKeys(command));
            if (this.hasEvent(eventName)) {
                this.events[eventName] = this.events[eventName].filter(function (binned) { return (binned.handler !== handler); });
                if (!this.events[eventName].length) {
                    delete this.events[eventName];
                }
            }
            return this;
        };
        KeyBoard.prototype.trigger = function (command) {
            var eventName = KeyBoard.getEventName(KeyBoard.getKeys(command));
            if (this.hasEvent(eventName)) {
                this.triggerNumberEvent(eventName);
            }
        };
        KeyBoard.prototype.destroy = function () {
            this.activeKeys = [];
            this.off();
            document.removeEventListener('keydown', this.onKeyDown);
            document.removeEventListener('keyup', this.onKeyUp);
            window.removeEventListener('focus', this.dropKeys);
            window.removeEventListener('blur', this.dropKeys);
        };
        KeyBoard.prototype.dropKeys = function () {
            this.activeKeys = [];
        };
        KeyBoard.prototype.triggerNumberEvent = function (eventName) {
            this.events[eventName].forEach(function (binned) {
                binned.handler.call(binned.context, binned);
            });
        };
        KeyBoard.prototype.initialize = function () {
            KeyBoard.createValidateKeuMap();
            this.setHandlers();
        };
        KeyBoard.prototype.hasEvent = function (eventname) {
            return !!(this.events[eventname] && this.events[eventname].length);
        };
        KeyBoard.prototype.setHandlers = function () {
            document.addEventListener('keydown', this.onKeyDown, false);
            document.addEventListener('keyup', this.onKeyUp, false);
            window.addEventListener('focus', this.dropKeys, false);
            window.addEventListener('blur', this.dropKeys, false);
        };
        KeyBoard.prototype.onKeyDown = function (event) {
            this.addActiveKey(event.keyCode);
            var eventName = KeyBoard.getEventName(this.activeKeys);
            if (this.hasEvent(eventName)) {
                event.preventDefault();
                this.triggerNumberEvent(eventName);
            }
        };
        KeyBoard.prototype.addActiveKey = function (keyCode) {
            if (this.activeKeys.indexOf(keyCode) !== -1) {
                console.warn('duplicate key! ' + keyCode);
            }
            else {
                if (KeyBoard.validKeys.indexOf(keyCode) != -1) {
                    this.activeKeys.push(keyCode);
                    this.activeKeys.sort(KeyBoard.sort);
                }
            }
        };
        KeyBoard.prototype.onKeyUp = function (event) {
            this.activeKeys = this.activeKeys.filter(function (code) { return (event.keyCode !== code); });
        };
        KeyBoard.getKeys = function (command) {
            return command.split("+").map(function (char) {
                var key = char.toLowerCase();
                if (key in KeyBoard.keyMap) {
                    return KeyBoard.keyMap[key];
                }
                else {
                    console.error('Неизвестная клавиша! ' + char);
                    throw new Error('Неизвестная клавиша! ' + char);
                }
            }).sort(KeyBoard.sort);
        };
        KeyBoard.getEventName = function (keys) {
            return keys.join('+');
        };
        KeyBoard.sort = function (a, b) {
            return a - b;
        };
        KeyBoard.createValidateKeuMap = function () {
            for (var key in this.keyMap) {
                if (this.keyMap.hasOwnProperty(key)) {
                    this.validKeys.push(this.keyMap[key]);
                }
            }
        };
        KeyBoard.keyMap = {
            'backspace': 8,
            'tab': 9,
            'enter': 13,
            'shift': 16,
            'ctrl': 17,
            'alt': 18,
            'pause_break': 19,
            'caps_lock': 20,
            'escape': 27,
            'page_up': 33,
            'page_down': 34,
            'end': 35,
            'home': 36,
            'left': 37,
            'up': 38,
            'right': 39,
            'down': 40,
            'insert': 45,
            'delete': 46,
            '0': 48,
            '1': 49,
            '2': 50,
            '3': 51,
            '4': 52,
            '5': 53,
            '6': 54,
            '7': 55,
            '8': 56,
            '9': 57,
            'a': 65,
            'b': 66,
            'c': 67,
            'd': 68,
            'e': 69,
            'f': 70,
            'g': 71,
            'h': 72,
            'i': 73,
            'j': 74,
            'k': 75,
            'l': 76,
            'm': 77,
            'n': 78,
            'o': 79,
            'p': 80,
            'q': 81,
            'r': 82,
            's': 83,
            't': 84,
            'u': 85,
            'v': 86,
            'w': 87,
            'x': 88,
            'y': 89,
            'z': 90
        };
        KeyBoard.validKeys = [];
        return KeyBoard;
    })();

   new KeyBoard().on('ctrl+e', function () {
      alert('ctrl+e')
   });
</script>