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                            ## 數組的常用方法有那些？


### 改變原數組的方法(9個):

### ES5:

a.pop()/ a.shift()/ a.push()/ a.unshift()/ a.reverse()/ a.splice()/ a.sort()

## ES6:

a.copyWithin() / a.fill

### 不改變原數組的方法(8個):

### ES5：

join、toLocateString、toStrigin、slice、cancat、indexOf、lastIndexOf、

### ES7：

includes

### 遍歷方法(12個):

### ES5：

forEach、every 、some、 fliter、map、reduce、reduceRight、

ES6：

find、findIndex、keys、values、entries
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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