Extjs4 filefield上传后返回信息页面异常

Ext.override(Ext.form.Action.Submit,{
processResponse : function(response){
this.response = response;
var data = response.responseText;
if(data.indexOf('<pre>') != -1||data.indexOf('<PRE>') != -1) {
response.responseText = data.substring(5, data.length-6);
this.response = Ext.JSON.decode(response.responseText);
}
if(!response.responseText){
return true;
}
this.result = this.handleResponse(response);
return this.result;
}
});

response.setCharacterEncoding("utf-8");
response.setContentType("text/html");

转载 http://liubl2011.iteye.com/blog/1242736