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                            ## 判斷文件是否為xlsx格式文件
> yunj.isXlsx(file)

說明：判斷文件是否為xlsx格式文件。返回bool類型結果。

> 參數

| 參數 | 類型 | 必須 | 說明 |
| --- | --- | --- | --- |
| file | string | 是 | 文件名 |

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

                







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