How to implement multiple parameters in el-dropdown in ElementUI

<el-dropdown @command="handleCommand">
  <span class="el-dropdown-link">
    Drop-down menu<i class="el-icon-arrow-down el-icon--right"></i>
  </span>
  <el-dropdown-menu slot="dropdown">
    <el-dropdown-item command="a">Golden Cake</el-dropdown-item>
    <el-dropdown-item command="b">Lion Head</el-dropdown-item>
    <el-dropdown-item command="c">Snail rice noodle</el-dropdown-item>
    <el-dropdown-item command="d" disabled>Double Skin Milk</el-dropdown-item>
    <el-dropdown-item command="e" divided>Oyster Omelet</el-dropdown-item>
  </el-dropdown-menu>
</el-dropdown>

<style>
  .el-dropdown-link {
    cursor: pointer;
    color: #409EFF;
  }
  .el-icon-arrow-down {
    font-size: 12px;
  }
</style>

<script>
  export default {
    methods: {
      handleCommand(command) {
        this.$message('click on item ' + command);
      }
    }
  }
</script>

<el-table-column label="Operation 1">
    <template slot-scope="scope">
        <el-dropdown split-button type="primary" @command="handleCommand">
            Other operations <el-dropdown-menu slot="dropdown" >
                <el-dropdown-item :command="beforeHandleCommand(scope.$index, scope.row,'a')">Abandoned</el-dropdown-item>
                <el-dropdown-item :command="beforeHandleCommand(scope.$index, scope.row,'b')">Upload original</el-dropdown-item>
                <el-dropdown-item :command="beforeHandleCommand(scope.$index, scope.row,'c')">Original arrangement</el-dropdown-item>
                <el-dropdown-item disabled :command="beforeHandleCommand(scope.$index, scope.row,'d')">Freeze</el-dropdown-item>
                <el-dropdown-item disabled :command="beforeHandleCommand(scope.$index, scope.row,'e')">Unfreeze</el-dropdown-item>
            </el-dropdown-menu>
        </el-dropdown>
    </template>
</el-table-column>

<script>
export default {
    methods: {
        handleAbandon(index, row) {
           //todo
        },
        handleUpload (index, row) {
            //todo
        },
        handleSettle(index, row){
           //todo   
        },
        beforeHandleCommand(index, row, command){
            return {
                'index': index,
                'row': row,
                'command':command
            }
        },
        handleCommand(command) {
            switch (command.command) {
                case "a"://abandon this.handleAbandon(command.index,command.row);
                    break;
                case "b"://Upload the original this.handleUpload (command.index, command.row);
                    break;
                case "c"://Original arrangement this.handleSettle(command.index,command.row);
                    break;
            }
        }
    },
}
</script>