如何将对象转换为location%5Bokrug%5D%5B%5D=38&location%5Bokrug%5D%5B%5D=41：

let filter = {
    location: {
        okrug: [38, 41]
    }
}

URLSearchParams没有帮助：

console.log(new URLSearchParams(filter).toString()) //got location=%5Bobject+Object%5D

location%5Bokrug%5D%5B%5D=38&location%5Bokrug%5D%5B%5D=41