适用于创建复杂、动态的用户界面，这些界面需要在不引起导航的情况下进行多次并发数据交互。
Fetchers 跟踪其独立的自身状态，可用于加载数据、提交表单以及与 loaders 和 actions 进行一般性交互。
import { useFetcher } from "react-router"
function SomeComponent() {
let fetcher = useFetcher()
// states are available on the fetcher
fetcher.state // "idle" | "loading" | "submitting"
fetcher.data // the data returned from the action or loader
// render a form
<fetcher.Form method="post" />
// load data
fetcher.load("/some/route")
// submit data
fetcher.submit(someFormRef, { method: "post" })
fetcher.submit(someData, {
method: "post",
encType: "application/json"
})
}
useFetcher(options): FetcherWithComponents
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