``` export default (arr) => { // 选择排序 for (let i = 0, len = arr.length, min; i < len; i++) { min = arr[i] for (let j = i + 1; j < len; j++) { if (arr[j] < min) { let c = min min = arr[j] arr[j] = c } } arr[i] = min } return arr } ```