ExtJs异步无法向外传值和赋值的完美解决办法

var testStore = new Ext.data.GroupingStore({
   proxy : new Ext.data.HttpProxy({
      url : ''
   }),
   reader : new Ext.data.JsonReader({
      root : 'hstamcx',
      totalProperty : "results",
      fields : ["id","value"]
   })
});
Ext.onReady(function(){
     Ext.QuickTips.init();
     Ext.form.Field.prototype.msgTarget = 'side';
     testStore.load (); 
     var reCount = testStore.getCount();
     var port = new Ext.Viewport({
        layout : 'auto',
        frame : true,
        items : [winKey]
     });
});

Ext.onReady(function(){
     Ext.QuickTips.init();
     Ext.form.Field.prototype.msgTarget = 'side';
     testStore.load({
        callback : function(r, options, success) {
           var reCount = testStore.getCount();
        }
     });
     var port = new Ext.Viewport({
        layout : 'auto',
        frame : true,
        items : [winKey]
     });
});

  var cancelMode;
     Ext.Ajax.request({
        url: '',
        method: 'post',
        sync:true, //同步请求
        success: function(response) {
           var respOnse= Ext.util.JSON.decode(response.responseText);
           cancelMode = response.hstamcx[0].param_value;
        }
      });

public void getData(HttpServletResponse response){
      TestData td = TestDataDao.getTestdata();
      String message = "{name:" + td .getName()+ ",id:" + td.getId()+ "}";
      PrintWriter out=response.getWriter();
      out.write(message);
      out.flush();
   }