转载：模仿JQuery.extend函数扩展自己对象，来自：http://www.cnblogs.com/wbkt2t

转载：模仿JQuery.extend函数扩展自己对象，

来自：http://www.cnblogs.com/wbkt2t

 

 

            MyMath.extend = function(){
                // copy reference to target object
                var target = arguments[0] ||
                {}, i = 1, length = arguments.length, deep = false, options;
                
                // Handle a deep copy situation
                if (typeof target === "boolean") {
                    deep = target;
                    target = arguments[1] ||
                    {};
                    // skip the boolean and the target
                    i = 2;
                }
                
                // Handle case when target is a string or something (possible in deep copy)
                if (typeof target !== "object" && !jQuery.isFunction(target)) 
                    target = {};
                
                // extend jQuery itself if only one argument is passed
                if (length == i) {
                    target = this;
                    --i;
                }
                
                for (; i < length; i++) 
                    // Only deal with non-null/undefined values
                    if ((options = arguments[i]) != null) 
                        // Extend the base object
                        for (var name in options) {
                            var src = target[name], copy = options[name];
                            
                            // Prevent never-ending loop
                            if (target === copy) 
                                continue;
                            
                            // Recurse if we're merging object values
                            if (deep && copy && typeof copy === "object" && !copy.nodeType) 
                                target[name] = jQuery.extend(deep, // Never move original objects, clone them
             src || (copy.length != null ? [] : {}), copy);
                            
                            // Don't bring in undefined values
                            else 
                                if (copy !== undefined) 
                                    target[name] = copy;
                            
                        }
                
                // Return the modified object
                return target;
            };

 

 

调用方法

 

 MyMath.extend({
                Mul: function(a, b){
                    return a * b;
                },
                Div: function(a, b){
                    return a / b;
                }
            });