ajax

$.ajax({
      type: "GET",
      url: "url.html",
      data: {"key":"value",.....},
      dataType: "json",
      success: function(data){},
      error : function(){}
});

POST

$.post(url,data, function(msg)         {
      //msg返回值，可以为json或者字符串
});

GET

 $.get(url,data, function(msg)         {
     //msg返回值，可以为json或者字符串
});