How to use/call Query String value in Javascript

In this article I am explain, How to use/call Query String value in Javascript

function getParameterByName(name) {

    name = name.replace(/[\[]/, "\\[").replace(/[\]]/, "\\]");

    var regex = new RegExp("[\\?&]" + name + "=([^&#]*)"),

        results = regex.exec(location.search);

    return results === null ? "" : decodeURIComponent(results[1].replace(/\+/g, " "));

}

Use above function to get query string value

var prodId = getParameterByName('querystringid');

Fullsource Code:

<script type="text/javascript">

       function getParameterByName(name) {


    name = name.replace(/[\[]/, "\\[").replace(/[\]]/, "\\]");

    var regex = new RegExp("[\\?&]" + name + "=([^&#]*)"),

        results = regex.exec(location.search);

    return results === null ? "" : decodeURIComponent(results[1].replace(/\+/g, " "));

}

var prodId = getParameterByName('querystringid');


    </script>

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