Ajax 缺少;

eval("r.value = " + responseText + "*" + "/");
缺少 ;

 [AjaxMethod]
  public string CheckRelation(object tw_userid, object tw_targetid)
  {
  return Write.IfFriend(Convert.ToString(tw_userid), Convert.ToString(tw_targetid));
  }


 public static string IfFriend(string tw_userid, string tw_targetid)
  {
  string Res = "N";
  try
  {
  string sql = "select tw_userid,tw_targetid from US_T_friend where tw_userid=@tw_userid and tw_targetid=@tw_targetid";
  Hashtable h = new Hashtable();
  h.Add("@tw_userid", tw_userid);
  h.Add("@tw_targetid", tw_targetid);
  DataTable dt = new YuSql().GetDataTable(sql, h);
  if (dt.Rows.Count > 0)
  {
  Res = "Y";
  }
  }
  catch { }
  return Res;
  }

这是Js

 var res=UserConctrol_Write.CheckRelation(use_id,frd_id);

也是才学着东东

JScript code

eval("r.value = \"" + responseText + "*\/\";");

要转义，楼上的没错。