Jquery ajax跨域访问的问题

$(document).ready(function(){   var orderId="200902001";   var userId="290001";     var url ='http://dataservice.yimei.com/servlet/addChannelActivityDetail?orderId='+orderId+'&userId='+userId+'&callback=?';   $.getJSON(url,function(data){}); }); //注意 1) 用$.getJSON这种方式; 2) &callback=?这句很重要 //跨域 String callback = request.getParameter("callback"); ..... JSONArray jsonArray = JSONArray.fromObject(list); JSONObject json= new JSONObject(); json.put("users", jsonArray); response.getWriter().write(callback+"("+json.toString()+");");