Retrieve query string parameter values in Javascript

Below is the Javascript code to fetch the query string parameter values from the URL.

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function buttonClick() { var _QS = getQueryString(); if (_QS['data'] == 'service') { // Service logic here } else if (_QS['data'] == 'sales') { // Sales logic here } } function getQueryString() { var _queryString = {}; var _query = window.location.search.substring(1); // Split the parameters var _vars = _query.split("&"); for (var i = 0; i < _vars.length; i++) { // Split the Name & Value pair var _pair = _vars[i].split("="); if (typeof _queryString[_pair[0]] === "undefined") { _queryString[_pair[0]] = _pair[1]; } else if (typeof _queryString[_pair[0]] === "string") { var _array = [_queryString[_pair[0]], _pair[1]]; _queryString[_pair[0]] = _array; } else { _queryString[_pair[0]].push(_pair[1]); } } return _queryString; }