自己动手实现jQuery Callbacks完整功能代码详解

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 );
                    }
                }

            &n