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                            ## u-upload監聽beforeRead事件無效？

beforeRead分為兩種：一個是作為props傳遞到組件里的函數，此為hook(鉤子)，即自定義組件讀文件的操作；一個是通過v-on訂閱組件讀取完文件的事件，但是只有當useBeforeRead為true時才會組件才會發送此事件(默認為不發送)。

```jsx
<u-upload :beforeRead="onBeforeReadHook" useBeforeRead @beforeRead="onBeforeReadEvent"   :fileList="fileList"  @afterRead="onUpload"  />
```

注意一定要添加useBeforeRead屬性(上述代碼為:useBeforeRead="true"的語法糖簡寫)，才能觸發beforeRead事件。

> 文檔描述為 是否啟用(顯示/隱藏)組件 ，此為文檔描述錯誤。
> 本文作者：不愛喝橙子汁




參考鏈接：[upload組件](https://www.uviewui.com/components/upload.html)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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