用法和$.Callbacks完全一致 ， 但是只是实现了add , remove , fire , empty, has和带参数的构造函数功能，  $.Callbacks 还有disable,disabled, fireWith , fired , lock, locked 方法

 代码如下：

        // Simulate jQuery.Callbacks object
        function MyCallbacks( options )
        {
            var ops = { once: false, memory: false, unique: false, stopOnFalse: false };

            if ( typeof options === \'string\' && options.trim() !== \'\' )
            {
                var opsArray = options.split( /\\s+/ );
                for ( var i = 0; i < options.length; i++ )
                {
                    if ( opsArray[i] === \'once\' )
                        ops.once = true;
                    else if ( opsArray[i] === \'memory\' )
                        ops.memory = true;
                    else if ( opsArray[i] === \'unique\' )
                        ops.unique = true;
                    else if ( opsArray[i] === \'stopOnFalse\' )
                        ops.stopOnFalse = true;
                }
            }

            var ar = [];
            var lastArgs = null;
            var firedTimes = 0;

            function hasName( name )
            {
                var h = false;

                if ( typeof name === \'string\'
                    && name !== null
                    && name.trim() !== \'\'
                    && ar.length > 0 )
                {
                    for ( var i = 0; i < ar.length; i++ )
                    {
                        if ( ar[i].name === name )
                        {
                            h = true;
                            break;
                        }
                    }
                }

                return h;
            }

            // add a function
            this.add = function ( fn )
            {
                if ( typeof fn === \'function\' )
                {
                    if ( ops.unique )
                    {
                        // check whether it had been added before
                        if ( fn.name !== \'\' && hasName( fn.name ) )
                        {
                            return this;
                        }
                    }

                    ar.push( fn );

                    if ( ops.memory )
                    {
                        // after added , call it immediately
                        fn.call( this, lastArgs );
                    }
                }

                return this;
            };

            // remove a function
            this.remove = function ( fn )
            {
                if ( typeof ( fn ) === \'function\'
                    && fn.name !== \'\'
                    && ar.length > 0 )
                {
                    for ( var i = 0; i < ar.length; i++ )
                    {
                        if ( ar[i].name === fn.name )
                        {
                            ar.splice( i, 1 );
                        }
                    }
                }

                return this;
            };

            // remove all functions
            this.empty = function ()
            {
                ar.length = 0;
                return this;
            };

            // check whether it includes a specific function
            this.has = function ( fn )
            {
                var f = false;

                if ( typeof ( fn ) === \'function\'
                    && fn.name !== \'\'
                    && ar.length > 0 )
                {
                    for ( var i = 0; i < ar.length; i++ )
                    {
                        if ( ar[i].name === fn.name )
                        {
                            f = true;
                            break;
                        }
                    }
                }

                return f;
            };

            // invoke funtions it includes one by one
            this.fire = function ( args )
            {
                if ( ops.once && firedTimes > 0 )
                {
                    return this;
                }

                if ( ar.length > 0 )
                {
                    var r;

                    for ( var i = 0; i < ar.length; i++ )
                    {
                        r = ar[i].call( this, args );

                        if ( ops.stopOnFalse && r === false )
                        {
                            break;
                        }
                    }
                }

                firedTimes++;

                if ( ops.memory )
                {
                    lastArgs = args;
                }

                return this;
            };
        };