Ext 進度條Ajax取值

<link rel="stylesheet" href="ext-3.2.1/resources/css/ext-all.css"/><script type="text/javascript" language="javascript" src="ext-3.2.1/adapter/ext/ext-base.js"></script><script type="text/javascript" language="javascript" src="ext-3.2.1/ext-all.js"></script><script type="text/javascript" language="javascript" src="ext-3.2.1/examples/shared/examples.js"></script><script type="text/javascript"> Ext.onReady(function(){  var pbar= new Ext.ProgressBar({   id:'pbar',   width:300,   value:100,   renderTo:Ext.getBody()  });  var task={   run:function(){    Ext.Ajax.request({     url:'ProgressBar.jsp',     params:{curr:pbar.value},     success:function(response,options){      var value=response.responseText;      pbar.updateProgress(parseFloat(value),Math.random(parseInt(value*100))+"%");      if(Math.random(parseInt(value*100))==100){       pbar.updateText("載入完成");        Ext.TaskMgr.stop(task);      }     },     failure:function(){      Ext.DomHelper.insertHmtl('beforeEnd',Ext.getBody().dom,"載入失敗");      }www.2cto.com    })   },   interval:500  }  Ext.TaskMgr.start(task);    });</script>  jsp中代碼<% System.out.println("載入資料中..."); String curr=request.getParameter("curr"); System.out.println(curr); out.println(curr+100);%>