本文实例讲述了JS原型与继承操作。分享给大家供大家参考，具体如下：
<script> 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(); </script>
这里使用在线HTML/CSS/JavaScript代码运行工具：测试运行结果如下：
更多关于JavaScript相关内容还可查看本站专题：《javascript面向对象入门教程》、《JavaScript错误与调试技巧总结》、《JavaScript数据结构与算法技巧总结》、《JavaScript遍历算法与技巧总结》及《JavaScript数学运算用法总结》
希望本文所述对大家JavaScript程序设计有所帮助。
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