一次 for 循环遍历就可以了

[xiao-tiger]

function getIndex(arr){
  let index = -1
  let minV = Infinity
  for (let i = 0; i < arr.length; i++) {
    if (arr[i] > 0 && arr[i] < minV) {
      minV = arr[i]
      index = i
    }
  }

  return index;
}