// MARK: - 异步Post方式
     func asynchronousPost()
     {
         //创建NSURL对象
         var url:NSURL! = NSURL(string: "http://m.weather.com.cn/data/101010100.html")

         //创建请求对象
         var request : NSMutableURLRequest = NSMutableURLRequest(URL: url, cachePolicy: NSURLRequestCachePolicy.UseProtocolCachePolicy, timeoutInterval: )

         request.HTTPMethod = "POST"//设置请求方式为POST，默认为GET

         var str:String = "type=focus-c";//设置参数
         var data:NSData = str.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: true)!
         request.HTTPBody = data;

         //连接服务器
         var connection = NSURLConnection(request: request, delegate: self)
     }

     // MARK: - NSURLConnectionDataDelegate
     func connection(connection: NSURLConnection, willSendRequest request: NSURLRequest, redirectResponse response: NSURLResponse?) -> NSURLRequest?
     {
         //将要发送请求
         return request
     }

     func connection(connection: NSURLConnection, didReceiveResponse response: NSURLResponse)
     {
         //接收响应
     }

     var jsonData:NSMutableData =  NSMutableData()
     func connection(connection: NSURLConnection, didReceiveData data: NSData)
     {
         //收到数据
         self.jsonData.appendData(data)
     }

     func connection(connection: NSURLConnection, needNewBodyStream request: NSURLRequest) -> NSInputStream?
     {
         //需要新的内容流
         return request.HTTPBodyStream
     }

     func connection(connection: NSURLConnection, didSendBodyData bytesWritten: Int, totalBytesWritten: Int, totalBytesExpectedToWrite: Int)
     {
         //发送数据请求
     }

     func connection(connection: NSURLConnection, willCacheResponse cachedResponse: NSCachedURLResponse) -> NSCachedURLResponse?
     {
         //缓存响应
         return cachedResponse
     }

     func connectionDidFinishLoading(connection: NSURLConnection)
     {
         //请求结束

         var jsonString = NSString(data: self.jsonData, encoding: NSUTF8StringEncoding)

         println(jsonString)

         let dict:AnyObject? = NSJSONSerialization.JSONObjectWithData(self.jsonData, options: NSJSONReadingOptions.AllowFragments, error: nil)

         //已下代码 重新修订
 //        var dic = dict as NSDictionary
 //
 //        let weatherinfoDic = dic.objectForKey("weatherinfo") as? NSDictionary
 //        let city = weatherinfoDic?.objectForKey("city") as? String
 //        let date_y = weatherinfoDic?.objectForKey("date_y") as? String
 //        let temp1 = weatherinfoDic?.objectForKey("temp1") as? String
 //
 //        let alert = UIAlertView(title: (city! + date_y!), message: temp1!, delegate: nil, cancelButtonTitle: "确定")
 //        alert.show()

         //2015年4月10号修改
         if var dic = dict as? NSDictionary
         {
             let weatherinfoDic = dic.objectForKey("weatherinfo") as? NSDictionary
             let city = weatherinfoDic?.objectForKey("city") as? String
             let date_y = weatherinfoDic?.objectForKey("date_y") as? String
             let temp1 = weatherinfoDic?.objectForKey("temp1") as? String

             let alert = UIAlertView(title: (city! + date_y!), message: temp1!, delegate: nil, cancelButtonTitle: "确定")
             alert.show()
         }
     }