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function bc3122Function(){
  var url = 'ajax_bc3122_action.action';
  var params = {
  strflg : "SelectCount",
  txtctl_Type : "1",
  txtctl_Code : "978",
  txtctl_SubCode : "0"
  }
  var myAjax = new Ajax.Request(
  url,
  {method:'post',parameters:params,onComplete:doSelect_back,asynchronous:true});
  }
  function doSelect_back(request){
  var action = request.responseJSON;//ÕâÊÇnull
  alert(action);
  }

struts.xml
<package name="ajaxBC3122json" extends="json-default">
<action name="ajax_bc3122_action" class="bc3122_00Action">
<result type="json"></result>
</action>
</package>
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