1/* 2 * Copyright (c) 2023 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16class Car { 17 constructor(brand) { 18 this.carname = brand; 19 } 20 present() { 21 return 'I have a ' + this.carname; 22 } 23} 24 25class Model extends Car { 26 constructor(brand, mod) { 27 super(brand); 28 this.model = mod; 29 } 30 show() { 31 return this.present() + ', it is a ' + this.model; 32 } 33 34 ["123"]() { // computed properties 35 return 0; 36 } 37} 38 39let myCar = new Model("Ford", "Mustang");