js原型与继承
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 | var Beverage = function(){}; Beverage.prototype.boilWater = function(){ console.log( "把水煮沸" ); }; Beverage.prototype.brew = function(){ throw new Error( "子类必须重写该方法" ); }; Beverage.prototype.pourInCup = function(){ throw new Error( "子类必须重写该方法" ); }; Beverage.prototype.addCondiments = function(){ throw new Error( "子类必须重写该方法" ); }; Beverage.prototype.customerWantsCondiments = function(){ return true ; }; Beverage.prototype.init = function(){ this .boilWater(); this .brew(); this .pourInCup(); if ( this .customerWantsCondiments){ this .addCondiments(); } }; var Coffee = function(){}; Coffee.prototype = new Beverage(); //继承父类Beverage Coffee.prototype.boilWater = function(){ console.log( "把水煮沸" ); }; Coffee.prototype.brew = function(){ console.log( "用沸水冲泡咖啡" ); }; Coffee.prototype.pourInCup = function(){ console.log( "把咖啡倒进杯子" ); }; Coffee.prototype.addCondiments = function(){ console.log( "加糖和牛奶" ); }; var Tea = function(){}; Tea.prototype = new Beverage(); //继承父类Beverage Tea.prototype.boilWater = function(){ console.log( "把水煮沸" ); }; Tea.prototype.brew = function(){ console.log( "用沸水浸泡茶叶" ); }; Tea.prototype.pourInCup = function(){ console.log( "把茶水倒进杯子" ); }; Tea.prototype.addCondiments = function(){ console.log( "加入柠檬" ); }; Tea.prototype.customerWantsCondiments = function(){ return window.confirm( "请问需要加调料吗?" ); }; var coffee = new Coffee(); //实例化Coffee coffee.init(); var tea = new Tea(); //实例化Tea tea.init(); |
分类:
前端技术
标签:
JavaScript
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