防止Update panel 局部刷新之后 javascript 方法丢失的解决方法之一

 function load() {
           //register the handler
        Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);
        }
        //this handler will execute after a partial postback
        function EndRequestHandler(){
           //...arbitrary code...
              }
        window.onload = load;