function getFirstOriginByHostRe-exportimport { getFirstOriginByHost } from "https://deno.land/x/deno_nest@v3.6.2/modules/uinv/mod.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