e.response.data.message就能拿到错误信息

// 删除凭据
    deleteCredential(id) {
      console.log(id);
      return assetManage.assetAccountDelete(id).then((res) => {
        console.log(res.message);
        this.$message.info(res.message);
        this.$refs.table.fetch();
      }).catch(e => {
        this.$message.info(e.response.data.message);
      })
    },