How to get QueryStirng on client side like ASPX or html etc

 function getQueryString(name) {
        name = name.replace(/[\[]/, "\\[").replace(/[\]]/, "\\]");
        var regex = new RegExp("[\\?&]" + name + "=([^&#]*)"),
        results = regex.exec(location.search);
        return results === null ? "" : decodeURIComponent(results[1].replace(/\+/g, " "));
    }


Call this method as :
    var ClassSectionID = getQueryString('Classsectionid');



Cheers!!!