Piwik延迟加载脚本

piwik有时候会卡页面，为了不影响页面，可以将Piwik代码放到最后加载

  <!-- Piwik -->
    <script type="text/javascript">
        function addLoadEvent(func) {
            window.addEventListener && window.addEventListener("load", func, false);
            window.attachEvent && window.attachEvent("onload", func);
        }

        addLoadEvent(function () {
            var pkBaseURL = "http:/。。。。。/piwik/";
            var piwikScript = window["document"]["createElement"]("script");
            piwikScript["type"] = "text/javascript";
            piwikScript["charset"] = "utf-8";
            piwikScript["defer"] = "defer";
            piwikScript["onload"] = function () {
                try {
                    var piwikTracker = Piwik.getTracker(pkBaseURL + "piwik.php", );
                    piwikTracker.trackPageView(); piwikTracker.enableLinkTracking();
                } catch (err) { }
            };
            piwikScript["src"] = pkBaseURL + "piwik.js";
            document.head.appendChild(piwikScript);
        });
    </script>
    <!-- End Piwik Code -->