我想在初始化函數(shù)中添加變量，但我不知道如何正確執(zhí)行這是我現(xiàn)在嘗試過的odoo.define('tw_pos_inherit_model.attemptInherit', function (require) {    "use strict";    var POSInheritmodel = require('point_of_sale.models');    var _super_order = POSInheritmodel.Order.prototype;    POSInheritmodel.Order = POSInheritmodel.Order.extend({        initialize: function(session,attributes){            var self = this;            this.additional_discount = 0;            _super_order.initialize.apply(this,arguments);        },我試過做這里所說的，但這個例子是針對 PosModel 而不是 Order這是錯誤point_of_sale.assets.js:79 Cannot read property 'name' of undefined TypeError: Cannot read property 'name' of undefined    at Engine.eval (eval at _render (http://localhost:8071/web/content/319-5a1ade2/web.assets_common.js:3416:73), <anonymous>:50:34)    at Engine._render (http://localhost:8071/web/content/319-5a1ade2/web.assets_common.js:3415:296)    at Engine.render (http://localhost:8071/web/content/319-5a1ade2/web.assets_common.js:3415:151)    at Engine._render (http://localhost:8071/web/content/319-5a1ade2/web.assets_common.js:3419:57)    at Engine.render (http://localhost:8071/web/content/319-5a1ade2/web.assets_common.js:3415:151)    at Class.render_orderline (http://localhost:8071/web/content/723-a89f195/point_of_sale.assets.js:306:5014)    at Class.renderElement (http://localhost:8071/web/content/723-a89f195/point_of_sale.assets.js:308:354)    at Class.replace (http://localhost:8071/web/content/723-a89f195/point_of_sale.assets.js:307:423)    at Class.start (http://localhost:8071/web/content/723-a89f195/point_of_sale.assets.js:325:810)    at http://localhost:8071/web/content/319-5a1ade2/web.assets_common.js:3684:52