ajax局部刷新div

ajax局部刷新页面:

$(document).ready(function(){
        $("#clickButton").click(function(){
        var url = "2.html";   //请求的地址
        var data = {type:1};
        $.ajax({
            type : "get",
            async : false,    //同步请求
            url : url,
            data : data,
            timeout:1000,
            success:function(dates){
                //alert(dates);
                var refreshContent="
                    $("#mainContent").html(refreshContent);   //要刷新的div
            },

               error: function() {

                  alert("ajax请求失败，请稍后再试！");

                }

            });

      });   
});

<div id="mainContent">