vuejs中如何动态拼接生成字段名

 var obj = {};
      this.selectData.forEach((item, index) => {
        var str = 'model_' + index + '_#profit_item_id';
        var str2 = 'model_' + index + '_#agent_id';
        this.$set(obj, str, item.match_uid);
        this.$set(obj, str2, item.id);
      });

      console.log(obj, 'obj');