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                            # 原型式繼承
```javascript

function Person() {

}
Person.prototype.color = "red";
function Anamal() {

}
Anamal.prototype =  Person.prototype;/*原型式繼承  會有數據共享的問題*/
var p = new Person();
var dog = new Anamal();
console.dir(p);/*查看原型鏈*/
console.dir(dog);

```
<br />

原型圖
*****
![](https://img.kancloud.cn/12/9f/129f288cc1eaa56cabc5f22d0b0cf30a_650x281.png)
*****
## 缺陷
會有數據共享的問題
**只能獲取原型上的屬性和方法，不能獲取構造函數上的屬性和方法**


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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