记录ICallbackEventHandler 同时并发访问容易引发的问题

如果多个脚本同时定时访问，容易引发脚本异常，没下就记下来了。

</script>
<script type="text/javascript">
function WebForm_CallbackComplete_SyncFixed() {
  for (var i = 0; i < __pendingCallbacks.length; i++) {
   callbackObject = __pendingCallbacks[ i ];
  if (callbackObject && callbackObject.xmlRequest && (callbackObject.xmlRequest.readyState == 4)) { 
   if (!__pendingCallbacks[ i ].async) {
     __synchronousCallBackIndex = -1;
   }
   __pendingCallbacks[i] = null;
   var callbackFrameID = "__CALLBACKFRAME" + i;
   var xmlRequestFrame = document.getElementById(callbackFrameID);
   if (xmlRequestFrame) {
     xmlRequestFrame.parentNode.removeChild(xmlRequestFrame);
   }
   WebForm_ExecuteCallback(callbackObject);
  }
 }
}
window.onload = function(){
if (typeof (WebForm_CallbackComplete) == "function") {
  WebForm_CallbackComplete = WebForm_CallbackComplete_SyncFixed;
}}
</script>