This is a javascript question

could you please help me fix my code. I would like my code to take the arr array and then reverse the elements in the array creating a new array called arrNew. I do not want to use the built in reverse() function. Please show me where my code is wrong.

var arr = [1,2,3,4,5,6,7,8,9];

var arrNew = [];

function reverseArray(arr){

for(i=arr.length-1; i>=0; i--){

arrNew = arrNew + arrNew.push(i)

}

document.writeln(arrNew)

}

reverseArray(arr)