JavaScript不使用prototype和new实现继承机制

此方法并非笔者原创，笔者只是在前辈的基础上，加以总结，得出一种简洁实用的Javascript继承方法。

      传统的Javascript继承基于prototype原型链，并且需要使用大量的new操作，代码不够简洁，可读性也不是很强，貌似还容易受到原型链污染。

      笔者总结的继承方式，简洁明了，虽然不是最好的方式，但希望能给读者带来启发。

      好了，废话不多说，直接看代码，注释详尽，一看就懂~~~

复制代码 代码如下:
 
 
 Object.prototype.clone = function(){
     var _s = this,
         newObj = {};
     _s.each(function(key, value){
         if(Object.prototype.toString.call(value) === "[object Function]"){
             newObj[key] = value;
         }
     });
     return newObj;
 };
 
 Object.prototype.each = function(callback){
     var key = "",
         _this = this;
     for (key in _this){
         if(Object.prototype.hasOwnProperty.call(_this, key)){
             callback(key, _this[key]);
         }
     }
 };
 
 Object.prototype.extend = function(ext){
     var child = this.clone();
     ext.each(function(key, value){
         child[key] = value;
     });
     return child;
 };
 
 Object.prototype.create = function(){
     var obj = this.clone();
     if(obj.construct){
         obj.construct.apply(obj, arguments);
     }
     return obj;
 };
 
 
 var Animal = {
     construct: function(name){
         this.name = name;
     },
     eat: function(){
         console.log("My name is "+this.name+". I can eat!");
     }
 };
 
 var Bird = Animal.extend({
     eat: function(food){
         console.log("My name is "+this.name+". I can eat "+food+"!");
     },
     fly: function(){
         console.log("I can fly!");
     }
 });
 
 var birdJim = Bird.create("Jim"),
     birdTom = Bird.create("Tom");
 birdJim.eat("worm");  //My name is Jim. I can eat worm!
 birdJim.fly();  //I can fly!
 birdTom.eat("rice");  //My name is Tom. I can eat rice!
 birdTom.fly();  //I can fly!