xhr和代码上传服务器问题问题

我的代码本地没问题，但是一旦上传带服务器上就会报xhr错误，各位大神知道这是为什么吗？

  function getHANDLE_USER_ID(project_id) {
        if (IsEmpty(project_id))
            return;
        $.ajax({
            url: base + "/mobile/sys/getHANDLE_USER_ID.do?PROJECT_IDS="
            + project_id + "&t=" + new Date(),
            dataType: "json",
            success: function (data) {
                var $select = $("#SELECT_USER_ID");
                $select.empty();
                var options=$("#HANDLE_USER_NAME option:selected");
                var gong=options.val();
                $.each(data, function (i, list) {
                   if(Get(list.USER_ID)==gong){
                        $select.append("<option aria-checked='true' selected='selected' value='" + Get(list.USER_ID) + "' >"
                            + Get(list.NAME) + "</option>");
                   }
                 else {
                       $select.append("<option value='" + Get(list.USER_ID) + "'>"
                            + Get(list.NAME) + "</option>");
                    }
                });
            }
        });

    }

    这是jsp代码
    ![](https://img-ask.csdn.net/upload/201710/24/1508815979_454572.png)
    ![](https://img-ask.csdn.net/upload/201710/24/1508815957_84818.png)
    ![](https://img-ask.csdn.net/upload/201710/24/1508815935_484443.png)