如何获取在javascript中初始化请求的ID更新面板

您可以使用，

get_updatePanelsToUpdate

<script>    window.onload = function() {        var prm = Sys.WebForms.PageRequestManager.getInstance();        prm.add_initializeRequest(InitializeRequest);        prm.add_endRequest(EndRequest);    };      function InitializeRequest(sender, args)       {   // get the array of update panels id         var UpdPanelsIds = args.get_updatePanelsToUpdate();         // get the Post ID         args.get_postBackElement().id;      }      function EndRequest(sender, args) {      }</script>

http://msdn.microsoft.com/en-
us/library/ee224805.aspx