$.ajax 非ie内核浏览器 兼容问题
$.ajax({
  type: "POST", //访问WebService使用Post方式请求
  contentType: "application/json", //WebService 会返回Json类型
  url: "../WebService1.asmx/PostPage2", //调用WebService的地址和方法名称组合---WsURL/方法名
  data: "{url:'http://111.1.37.187:18080/ihometownweb/hometownforum',postData:'busicode=70000&cityname=" + c1 + "'}", //这里是要传递的参数，格式为 data: "{paraName:paraValue}",下面将会看到  
  dataType: 'json',
  success: function(result) { //回调函数，result，返回值
// alert(result.d["content"]);
  if (result.d["content"] != "") {
  $("#bb").html(result.d["content"] + "</br>");
  }
  else { alert("请输入省级城市名称"); }
  }
  });



 public CityContent PostPage2(string url, string postData)
  {
  string err = null;
  Stream outstream = null;
  Stream instream = null;
  StreamReader sr = null;
  HttpWebResponse response = null;
  HttpWebRequest request = null;
  string content = null;

  // Encoding encoding = Encoding.UTF8;
  Encoding encoding = Encoding.GetEncoding("utf-8");
  byte[] data = encoding.GetBytes(postData);

  int iConnect = 0;
  while (iConnect < 10) //提交10次，如果不成功则返回null
  {
  // 准备请求... 
  try
  {
  // 设置参数 
  request = (HttpWebRequest)WebRequest.Create(url);
  CookieContainer cookieContainer = new CookieContainer();
  request.CookieContainer = cookieContainer;
  request.AllowAutoRedirect = true;
  request.Method = "POST";
  request.ContentType = "application/x-www-form-urlencoded";
  request.ContentLength = data.Length;

  outstream = request.GetRequestStream();
  outstream.Write(data, 0, data.Length);
  outstream.Close();

  //发送请求并获取相应回应数据 
  response = (HttpWebResponse)request.GetResponse();

  //直到request.GetResponse()程序才开始向目标网页发送Post请求 
  instream = response.GetResponseStream();
  sr = new StreamReader(instream, encoding);

  //返回结果网页（html）代码 
  content = sr.ReadToEnd();
  err = string.Empty;

  DataContractJsonSerializer _Json3 = new DataContractJsonSerializer(citycontent.GetType());
  byte[] _Using3 = System.Text.Encoding.UTF8.GetBytes(content);
  System.IO.MemoryStream _MemoryStream3 = new System.IO.MemoryStream(_Using3);
  _MemoryStream3.Position = 0;
  citycontent = (CityContent)_Json3.ReadObject(_MemoryStream3);
  return citycontent;
  }
  catc