javascript - Generate arrays of numbers in certain algorithm -

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so need few arrays: 

array 1 = [1,9,17,25,33,41];   array 2 = [2,10,18,26,34,42];

etc.
each array adds 8 last item.
but, need generate dynamically (using functions in javascript).

var initvalue = 5;  var diff = 8;  var len = 5;    function makediffarray(initvalue, diff, len) {    (var = 0, arr = []; < len; i++) {      arr.push(initvalue);      initvalue += diff;    }    return arr;  }  console.log(makediffarray(initvalue, diff, len));


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