JS原型与继承操作示例

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:http://tools.jb51.net/code/HtmlJsRun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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