Redirect - Remove query parameter for angular site. This JavaScript will redirect a visitor to the same URL with a query parameter removed, preserving the rest of the URL. For non-angular, change the line `window.location ..` to `window.location.replace(_optly.redir.href)`

redirect-remove-query-parameter-angular.js

/* _optimizely_redirect=http://www.example.com */

/* remove Query Parameter from url */
_optly = {redir: document.createElement("a")};
_optly.redir = {protocol: "https:" == document.location.protocol ? "https://" : "http://",
                domain: window.location.hostname,
                pathname: window.location.pathname
               };
queryToRemove = "TO_REPLACE";
_optly_cur_loc = window.location.href;
queryToRemoveIndexInHash = window.location.hash.indexOf(queryToRemove);
if (queryToRemoveIndexInHash > -1) {
  if (window.location.hash.length == queryToRemoveIndexInHash+queryToRemove.length) { // queryToRemove at end of URL
     _optly.redir.hash = window.location.hash.substring(0,queryToRemoveIndexInHash-1);
  } else { // queryToRemove no at end of URL
    _optly.redir.hash = window.location.hash.substring(0,queryToRemoveIndexInHash) + window.location.hash.substring(queryToRemoveIndexInHash+queryToRemove.length+1,window.location.hash.length);
  }
  _optly.redir.href = _optly.redir.protocol + _optly.redir.domain + _optly.redir.pathname + _optly.redir.hash + "?" + newQuery;
  window.location = _optly.redir.href;
}