JQuery使用Ajax调用后台方法

    $("#btn").click(function () {
        $.ajax({
            type: "Post",
            url: "WebForm1.aspx/GetStr",
            data: "{‘str‘:‘aaa‘,‘str2‘:‘bbb‘}",
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function (data) {
                alert(data.d);
            },
            error: function (err) {
                alert(err);
            }
        });
        return false;
    });

    [WebMethod]
    public static string GetStr(string str1, string str2)
    {
        return str1 + str2;
    }

    $(function () {
        $("#btGetDataTable").click(function () {
            $.ajax({
                type: "Post",
                url: "WebForm1.aspx/Traverse",
                data: "{}",
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: function (data) {
                    $("#table1").append(data.d);
                },
                error: function (err) {
                    alert(err);
                }
            });
            return false;
        });
    })

    [WebMethod]
    public static string Traverse()
    {

    }