$.ajax({
		   type:"post",
		   url:"action/addc.a",
		   data:{caption:paracaption,remark:pararemark},
		   dataType:"json",
		   success:function(data){
			  alert(JSON.stringify(data));
			  alert(data.msgtype);
		   },
		   error:function(XMLHttpRequest, textStatus, errorThrown){
			   alert(errorThrown);
		   }
	   });
 

jauery方法

$.ajaxSetup({
  async: false
  });

   $("#btnSubmit").click(
      function(){
       $.post(
         "url",
	 {
	   data
	 },
	 function(msg){
	 }
       );
      }  
   );