用的jsarr = [1,2,3,4,5,6,7,8,9]怎么输出3个间隔做倒序输出 [[3,2,1],[6,5,4],[9,8,7]]
const ary = [1, 2, 3, 4, 5, 6, 7, 8, 9]; const result = Array.from( {length: Math.ceil(ary.length / 3)}, (v, i) => ary.slice(i * 3, (i + 1) * 3).reverse(), ); console.log(result);
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