JavaScript 实现数组相邻元素上移与下移排序

//点击上移
clickUp(index){
 this.swapArray(this.tableData, index-1, index);
},
//点击下移
clickDown(index){
 this.swapArray(this.tableData, index, index+1);
},
//数组元素互换位置
swapArray(arr, index1, index2) {
 arr[index1] = arr.splice(index2, 1, arr[index1])[0];
 return arr;
},

<el-table-column label="顺序调整" min-width="80" align="center">
 <template slot-scope="scope">
  <div class="img_style">
   <img src="@/assets/images/up_01.png" v-if="scope.$index == 0">
   <img src="@/assets/images/up.png" @click="clickUp(scope.$index)" v-else>
   <img src="@/assets/images/down_01.png" v-if="scope.$index == tableData.length - 1">
   <img src="@/assets/images/down.png" @click="clickDown(scope.$index)" v-else>
  </div>
 </template>
</el-table-column>