Pure JS undo

gistfile1.js

/*
/**
  * @constructor
  */
Commands = function() {
    this.undoStack = [];
    this.redoStack = [];
};

/**
  * Executes an action and adds it to the undo stack.
  * @param {function()} action Action function.
  * @param {function()} reverse Reverse function.
  * @param {Object=} ctx The 'this' argument for the action/reverse functions.
  */
Commands.prototype.execute = function(action, reverse, ctx) {
    this.undoStack.push( {action: action, reverse: reverse, ctx: ctx} );
    action.call(ctx);
    this.redoStack.length = 0;
};

Commands.prototype.undo = function() {
    var c = this.undoStack.pop();
    if (c) {
        c.reverse.call(c.ctx);
        this.redoStack.push(c);
    }
};

Commands.prototype.redo = function() {
    var c = this.redoStack.pop();
    if (c) {
        c.action.call(c.ctx);
        this.undoStack.push(c);
    }
};