$.ajax
       ({
            cache: false,
            async: false,   // 太关键了，学习了，同步和异步的参数
            dataType: 'json', type: 'post',
            url: "../handle/Ladder_Fee_Code.ashx?ajaxaction=Select_FangAn",
            success: function (data)
            {
             alert("1");
            }
        });
             alert("2");