Test

[Sapphire611]

哈哈哈

[Sapphire611]

`javascript
"use strict";

const replaceArray = (arr) => {
let list = [];
for (let i = 0; i < arr.length; i += 2) {
if (arr[i + 1] <= arr.length && list.push(arr[i + 1]))
list.push(arr[i]);
}
return list;
}

// let arr = [1,2,3,4];
// let res = replaceArray(arr);
// console.log(res);
`

[Sapphire611]

"use strict";

const replaceArray = (arr) => {
  let list = [];
  for (let i = 0; i < arr.length; i += 2) {
    if (arr[i + 1] <= arr.length && list.push(arr[i + 1]))
      list.push(arr[i]);
  }
  return list;
}

// let arr = [1,2,3,4];
// let res = replaceArray(arr);
// console.log(res);