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                            # 數據通信
## 常見http狀態碼

## ajax
![請求參數序列化](https://box.kancloud.cn/45d1b8cd76e72ebb9bab55669ed4c0af_787x464.png)

## 同源策略

## 跨域資源訪問
- 不滿足同源策略的資源訪問，加跨域資源訪問
- w3c定義了CORS
- 現代瀏覽器已經實現了對CORS的支持

![CORS](https://box.kancloud.cn/a148a10b49388b481ae1a80454633d0a_883x476.png)

## 其他跨域技術
- Frame代理
- JSONP
- Comet
- Web Sockets
- ...

![Frame代理](https://box.kancloud.cn/cf770a13e3dedaa1ea44bf727cb0ec39_890x488.png)

##JSONP
- JSON with padding (填充式JSON)
- `<script>`可以跨域
- 請求一段js代碼

![JSONP](https://box.kancloud.cn/e4b60d9302d4f96c7b207a63077f0fcb_907x433.png)

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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