选择排序

Array.prototype.selectionSort = function() {
   for (let i = 0; i < this.length - 1; i += 1) {
   let indexMin = i;
    for (let j = i; j < this.length; j += 1) {
       if(this[j] < this[indexMin]) {
          indexMin = j
       }
    }
      const temp = this[i];
      this[i] = this[indexMin];
      this[indexMin] = temp;
   }
    console.log(this);
    return this
}
const arr = [5, 4, 3, 2, 1];
arr.selectionSort()