比较2个对象数组（带参数）并返回equals

I have this 2 arrays:

我有这两个数组:

var a = [{cod: 123, brand: 'Audi', model: 'A3', price: 15000, km: 20000}, 
         {cod: 456, brand: 'BMW', model: 320, price: 20000, km: 30000}]
var b = [{brand: 'Audi', model: 'A3', price: 100000, km: 100000}]
var a = [{co