How to display value on label using javascript in ASP.NET

<script type="text/javascript">
    function CountRows() {
        var totalRowCount = 0;
        var rowCount = 0;
        var gridView = document.getElementById("<%=GridView1.ClientID %>");
        var rows = gridView.getElementsByTagName("tr")
        for (var i = 0; i < rows.length; i++) {
            totalRowCount++;
            if (rows[i].getElementsByTagName("td").length > 0) {
                rowCount++;
            }
        }
        document.getElementById("lbl_total_users").innerText = totalRowCount;
        return false;
    }
</script>