Vue + elementUi，实现el-table上移、下移

实现思路

实现背景，table没有分页，这是前提！！

1 . 如果后台有接口，直接改动完把列表list提交给后端

2 . 如果没有后台，增加权重字段，提交到后端

3 . 上下移动，实际就是操作数组list的顺序index

Javascript

    ================ data ===================
    HotTableList:[]

    ================ html ===================
    <template v-slot="scope">
        <el-button  @click="upindex(scope.$index,scope.row)">上移</el-button>
        <el-button  @click="downindex(scope.$index,scope.row)">下移</el-button>
    </template>

    ================ 上移 ===================
    upindex(index, row) {
      if (index > 0) {
        let upDate = this.HotTableList[index - 1];
        this.HotTableList.splice(index - 1, 1);
        this.HotTableList.splice(index, 0, upDate);
      } else {
        this.$message.warning("已经是第一条了！");
        return false;
      }
    },

    ================ 下移 ===================
    downindex(index, row) {
      if (index + 1 === this.HotTableList.length) {
        this.$message.warning("已经是最后一条了！");
        return false;
      } else {
        let downDate = this.HotTableList[index + 1];
        this.HotTableList.splice(index + 1, 1);
        this.HotTableList.splice(index, 0, downDate);
      }
    },