自己动手实现jQuery Callbacks完整功能代码详解

                {
                    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++ )