jquery.ajax与nvelocity应用

1.返回json，更新页面

json.vm：{"error":"$!error","message":"$!msg"}

js：

$(function(){
     var data={id:$id,zhi:$zhi,ziduan:$ziduan};
     ${jq}post("/foodquickmod.aspx",data,function(dat){
      var sss=dat.message;
      $obj.parent("span").find("textarea").val(sss);
      $obj.parents("td").eq(0).find(".backtext").html(sss);
     },"json");
}

.cs

protected void Page_Load(object sender, EventArgs e)
{
string ziduan = Request.Params["ziduan"];
string zhi = Request.Params["zhi"];
string ids = Request.Params["id"];

string ssql = "update Food set " + ziduan + "='" + zhi + "' where systemid in (" + ids + ") ";

s.CreateSQLQuery(ssql).ExecuteUpdate();
s.Flush();

vh.Put("msg",zhi);
vh.Display("json");
}