function getFirstOriginByHostimport { getFirstOriginByHost } from "https://deno.land/x/oak_nest@v2.0.0/modules/uinv/src/tools/utils.ts"; getFirstOriginByHost(host: string): string根据host获取一级域名 Parametershost: string正常应该是www.baidu.com,或者localhost Returnsstring