I like this one depending of purpose
window.location.href.split("/")[2] == "localhost:17000" //always domain + port
You can apply it on any url-string
var url = "http://localhost:17000/sub1/sub2/mypage.html?q=12";
url.split("/")[2] == "localhost:17000"
url.split("/")[url.split("/").length-1] == "mypage.html?q=12"
Removing protocol, domain & path from url-string (relative path)
var arr = url.split("/");
if (arr.length>3)
"/" + arr.splice(3, arr.length).join("/") == "/sub1/sub2/mypage.html?q=12"