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                            # toDataURL在ios6，7無法導出base64碼

需求：

> 使用canvas將背景和二維碼合成一張圖片，導出成base64，給img標簽渲染顯示。
> 

一開始只是粗糙的使用：

~~~
  canvas.toDataURL()
~~~



這樣子導出了base64碼，在安卓機里正常使用


改用：

~~~
  canvas.toDataURL('image/jpeg', 1.0)
~~~

就成功過了

參考資料：

[手冊MDN](https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/toDataURL)

[社區同類問題](https://segmentfault.com/q/1010000009563760)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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