var arr = {        0:‘1‘,        1:‘2‘,        2:‘3‘,        length:3    };    function toArray(arr){        return [].slice.call(arr, 0);    }    console.log(toArray(arr));

    function makeArray(arr){        if(!arr) return [];        var length = arr.length || 0, results = new Array(length);        while(length -- ){            results[length] = arr[length];        }        return results    }