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~~~ function getArrayNum(arr,n1,n2){ var arr1=[],len=n2||arr.length-1; for(var i=n1;i<=len;i++){ arr1.push(arr[i]) } return arr1; } ​ getArrayNum([0,1,2,3,4,5,6,7,8,9],5,9) // [5, 6, 7, 8, 9] ~~~