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                            1. 
![](https://box.kancloud.cn/3ee3c63114533a9d82caf484620c79cc_463x195.png)
```
// for in打印出來的是key,有desc.
```
![](https://box.kancloud.cn/9a1994d155a3400c7c3cba1e0ea0d9d9_272x226.png)
2. 
![](https://box.kancloud.cn/74ebd69e66c7e1babba45a635cdb4b1a_564x241.png)
```
// for in打印出來的是value.
```
for each 不能用break
3. 
![](https://box.kancloud.cn/efd47e2e77cfc19023e9b9315acd5acb_458x167.png)
```
// for in打印出來的是value,沒有desc.可以break
```
![](https://box.kancloud.cn/172414f7fb57918be0a0d53add3bbf10_190x204.png)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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