急求！！！关于下面的js代码如何优化？

Question

if的代码如何优化到最简if(res.OrderInfo.OrderItems.GoodsSource==='JD'){res.OrderInfo.OrderItems.GoodsSource='京东';}elseif(res.OrderInfo.OrderItems.GoodsSource==='SF'){res.OrderInfo.OrderItems.GoodsSource='顺丰';}elseif(res.OrderInfo.OrderItems.GoodsSource==='SELF'){res.OrderInfo.OrderItems.GoodsSource='商户自营';}