UpdatePanel下javascript和样式无法加载

UpdatePanel是没有回发事件的所有，无法重新加载javascript和css

处理方法

                       <script type="text/javascript" language="javascript">
                            Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(BeginRequestHandler);
                            Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);
                            function BeginRequestHandler(sender, args) {
                                 //加载完成前
                            }
                            function EndRequestHandler(sender, args) {
                                 //加载完成后

                                 //从新加载js和css
                            }
                        </script>