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                            ```
var d=[1,2];//[1,2]

var a={
	a:'1',
	b:'2'
};
console.log(a);//{a:1,b:2}


var b=new Array;
b['a']=1;
b['c']=2;
console.log(b);//[a:1.c:2]
//刪除
delete b['a'];
```
尾部追加
```
arr =[{'num':1},{'num':2},{'num':3}];
 
newArr = arr.push({'num':4})
 
console.log(arr)
```
頭部追加
```
arr =[{'num':3},{'num':4},{'num':5}];
 
newArr = arr.unshift({'num':2})
 
console.log(arr)
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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