knex('users').orderBy([
  { column: 'email' }, 
  { column: 'age', order: 'desc' }
//等同于：
select * from `users` order by `email` asc, `age` desc

const fundItem = await mysql('fund_items')
                       .select('sum_share','sum_amount')
                       .where('fund_id',fund_id)
                       .orderBy([
                         { column: 'date' }, 
                         { column: 'id', order: 'desc' }
                       ]).first()
//等同于：
select `sum_share`, `sum_amount` from `fund_items` where `fund_id` = 1 order by `[object Object]`, `[object Object]` asc limit 1

Error: ER_BAD_FIELD_ERROR: Unknown column '[object Object]' in 'order clause'

const fundItem = await mysql('fund_items')
                       .select('sum_share','sum_amount')
                       .where('fund_id',fund_id)
                       .orderBy('date','asc').orderBy('id','desc').first()
//等同于
select `sum_share`, `sum_amount` from `fund_items` where `fund_id` = ? order by `date` asc, `id` desc limit