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                            * length屬性，獲取數組的長度
* arr[index]-->讀取數組的值
* arr[arr.length]-->向數組尾部添加值

>  Tip:數組的下標從0開始

~~~
       var arr=[1,2,3,4];
        var len=arr.length;
        console.log(len);
        var value = arr[1];
        console.log(value);
        arr[arr.length]=6;
        console.log(arr);
~~~
![](https://box.kancloud.cn/2ef06feda21b33af6d70521ee5b563e4_209x229.png)


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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