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                            ### 文件轉base64

```
const reader = new FileReader();
reader.onload = (e) => {
    var base64Str = e.target.result.split(",")[1]
}
reader.readAsDataURL(file);
```

### base64 轉文件

```js
function convertBase64UrlToBlob  (dataurl, filename) { 
	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 File([u8arr], filename || guid() + '.png', { type: mime });
}
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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