谁有Ext Core ajax现成的实例贴一个上来参考下！！！！！求

    Ext.Ajax.request({
    url:"controller.asp",
    method:"GET",
    disableCaching:true,
    params:{action:'xxx',code:obj.getValue(),id:''},
    success:function(response,op){
        var t = response.responseText;
        var obj = eval("(" + t + ")");
        alert(obj.xxx)
    }
});