var commands = {    up: 1,    down: 2,    father: 3,    child: 4,};var commandHandlerFactory = new CommandHandlerFactory();function Task(content, parent) {    this.content = content;    this.childTask = [];    this.parent = parent;    this.addChildTask = function (childContent) {        this.childTask.push(new Task(childContent));    };    this.remove = function () {        this.parent.childTask.remove(this);    };    this.edit = function (newContent) {        this.content = newContent;    };}function Mind(name) {    this.task = new Task(name, null);    this.selectTask = this.task;    this.keyDown = function (e) {        executeCommand(this.selectTask, e);    };}function executeCommand(selectedTask, e) {    var command = getCommand(e);    var handler = commandHandlerFactory.getCommandHandler(command);    handler.execute(selectedTask);}function CommandHandlerFactory() {    this.commandHandlers = [];    this.addCommandHandler = function (command, commandHandler) {        this.commandHandlers.push({ conmmand: command, commandHandler: commandHandler });    };    this.getCommandHandler = function (command) {        for (var i = 0; i < this.commandHandlers.length; i++) {            if (this.commandHandlers.command == command) {                return this.commandHandlers.commandHandler;            }        }    };}function getCommand(e) {    //TODO:need to check return which command    return commands.up;}