$.ajax({

  type: 'POST',

  url: url,

  data: data,

  success: success,

  dataType: dataType

});

显示错误加

error: function(XMLHttpRequest, textStatus, errorThrown) {

alert(XMLHttpRequest.status);

alert(XMLHttpRequest.readyState);

alert(textStatus);

},

$.post("test.php", { name: "John", time: "2pm" },

   function(data){

     alert("Data Loaded: " + data);

   });

alert(JSON.stringify(res));