关于向其站点post提交问题

	  <script language="JavaScript" type="text/JavaScript">

        function   testpost()   {    

       	

		  var url='http://www.b.com/select.asp';

		   var pars= 'HomeCity='+encodeURI('北京')';

           var myAjax = new Ajax.Request(  url,   { method:'post',

               //requestHeader: ['Content-Type','application/x-www-form-urlencoded'],  　//----------------  C

              parameters:pars,

             onComplete:showResponse

           }

          );

	   }



		function showResponse(prototype){//回调函数

		    var txtA = prototype.responseText;	

			 alert(txtA);

		}

     </script>