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                            ### 問題一

在Angular 2 中報錯誤：

```
ERROR Error: ExpressionChangedAfterItHasBeenCheckedError: Expression has changed after it was checked.
```

解決辦法參考：

- [Angular 2 detection explained](https://blog.thoughtram.io/angular/2016/02/22/angular-2-change-detection-explained.html)
- [Angular 2 Expression Changed After It Has Been Checked Exception](http://www.allenhashkey.com/web-development/angular2/angular-2-expression-changed-after-it-has-been-checked-exception/)


## 問題二

使用ng2-file-upload上傳前預覽圖片

參考：
- [Preview an image before it is uploaded](https://stackoverflow.com/questions/4459379/preview-an-image-before-it-is-uploaded)

## 問題三

在Angular2中基于模型驅動動態渲染checkbox組時，不能按照angularjs方式來處理。會涉及到`FormArray`如何使用。

參考：
- [Checkbox Group handling and Validation in Angular2](https://stackoverflow.com/questions/39674718/checkbox-group-handling-and-validation-in-angular2)

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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