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                            ### 將base64轉換為blob

```
 function dataURLtoBlob(dataurl) { 
    var arr = dataurl.split(',');
        mime = arr[0].match(/:(.*?);/)[1];
        bstr = atob(arr[1]);
        n = bstr.length;
        u8arr = new Uint8Array(n);
    while (n--) {
        u8arr[n] = bstr.charCodeAt(n);
    }
    return new Blob([u8arr], { type: mime });
}
```

### 將blob轉換為file


```
// 使用
blobToFile(blob, imgName)
```

```
function(theBlob, fileName){
   theBlob.lastModifiedDate = new Date();
   theBlob.name = fileName || guid() + '.png';
   return theBlob;
}

function?guid() {
????return?'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g,?function(c) {
????????var?r = Math.random()*16|0, v = c ==?'x'?? r : (r&0x3|0x8);
????????return?v.toString(16);
????});
}
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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