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                            ## 獲取文件格式后綴
> 方法：**yunj.fileExt(file)**

* 參數：
    | 參數 | 類型 | 必須 | 說明 |
    | --- | --- | --- | --- |
    | file | string | 是 | 文件名 |
* 返回值：string 類型
> 調用示例：

    ```javascript
    layui.use(['yunj'],function (){
        let file="test.xlsx";
        console.log(yunj.fileExt(file));    // xlsx
    });
    ```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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