冒泡排序

let array = [2, 5, 3, 1, 4]
    
function sort(arr) {
  let res = []

  if(!Array.isArray(arr))  return []

  for (var i = 0; i < arr.length; i++) {
    for (var j = i + 1; j < arr.length; j++) {
      if(arr[i] > arr[j]) {
        let template =  arr[i]
        arr[i] = arr[j]
        arr[j] = template
      }
    }
  }
  return res
}

console.log(sort(array), array)