不区分大小写的输入和ajax请求数据

function invitation_list(code){
    //邀请码(英文字母大写)
    if (code == null || code == "") {
        invitation_val = $("#invitation_val").val().toUpperCase();
            //邀请码存入sessionStorage
            sessionStorage.setItem("invitation_val", invitation_val);
            if(invitation_val.length != 8){
                $.MsgBox.Alert("提示", "请输入八位邀请码！");
                return;
            }
    }else{
        invitation_val = code;
    }
    $.ajax({
        url: "/h5do/h5_financeProduct/mb6185",
        type: "POST",
        dataType: "json",
        data: {
            inviteCode: invitation_val,
            tranflag:"0"
        },
        success: function(msg) {
            if (!msg.return) {
                $.MsgBox.Alert("提示","未知系统错误");
                after();
                return;
            }
            if (msg.return.retCode != "000000") {
                //errorBranch(msg, "", "1", "理财产品", "", infoData);
                financeErrorBranch(msg,"理财产品","goBack");
            } else {
                $("#haveId").hide();
                $("#buyManageID1").show();
                $("#buyManageID1").empty();
                rlist = msg.return.list;
                if (rlist == null || rlist.length == 0) {
                    var noResult = "
";
                    $("#buyManageID1").append(noResult);
                    recordFun("notreslut", "对不起，没有满足条件的查询数据！");
                    after();
                    return;
                }
                for (var i = 0; i < rlist.length; i++) {
                    publicFun(i,"buyManageID1");
                }
                after();
            }
        },
        complete:function(XMLHttpRequest, textStatus){
            after();
        },
        error: function(errorMsg) {
            $.MsgBox.Alert("提示","网络错误。");
        }
    });
}