How to get SITE URL in javascript

Below is the code that help to get the site url in javascript, the purpose of this code is Sometime we need the site url in using js, in mine case i need to call ajax and want to set site base url so I have used this code and passes this in ajax URL.

function getRootUrl() {
  var s = location.pathname.split("/");
  if ("localhost" == location.host) {
    var e = location.origin + "/" + s[1].trim("/") + "/";
  } else if ("localhost:3000" == location.host) {
    var e = location.origin + "/";
  } else {
    var e = location.origin + "/";
  }
  return e;
}

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