无法执行。。。不知道哪里有问题，麻烦老师给我解答下

不是很能理解，arr[ arr.length - i - 1 ] arr[ 8 - 0 - 1 ] => arr [ 7 ] = newArr[ 0 ] = 8 ??? arr[ 8 - 1 - 1 ] => arr [ 6 ] = newArr[ 1 ] = 7 ??? arr[ 8 - 2 - 1 ] => arr [ 5 ] = newArr[ 2 ] = 6 ??? arr[ 8 - 3 - 1 ] => arr [ 4 ] = newArr[ 3 ] = 5 ??? arr[ 8 - 4 - 1 ] => arr [ 3 ] = newArr[ 4 ] = 4 ??? arr[ 8 - 5 - 1 ] => arr [ 2 ] = newArr[ 5 ] = 3 ??? arr[ 8 - 6 - 1 ] => arr [ 1 ] = newArr[ 6 ] = 3 ??? arr[ 8 - 7 - 1 ] => arr [ 0 ] = newArr[ 7 ] = 3 ??? 不知道这么推理出来是否正确？

我下面又改了，自己的想法，不知道 是否行。。。 帮我分析下。

function arrReverse(arr) { var newArr = []; for (var i = 0; i < arr.length; i++) { //补充代码 console.log(i) newArr[i] = i + 1; } //补充代码 return newArr.reverse(); } document.write(arrReverse([1, 2, 3, 4, 5, 6, 7, 8]));