inheritCombination.js

时间:2022-03-08 08:33:09
// 组合继承
// 其基本思路是使用原型链实现对原型属性和方法的继承,而通过借用构造函数来实现对实例属性的继承 function Person(name){
this.name = name;
this.friends = ["Jack","John","Kim"];
}
Person.prototype.getName = function(){
console.log(this.name);
}
function SuperPerson(name,sex){
//继承Person
Person.call(this,name);/*第二次调用父类型的构造函数,在实例上又创建了一次属性name和frieds,屏蔽第一次调用时创建的*/
//实例属性
this.sex = sex;
}
SuperPerson.prototype = new Person();//重写原型,第一次调用父类型的构造函数
SuperPerson.prototype.constructor = SuperPerson;
//添加新方法
SuperPerson.prototype.getSex = function(){
console.log(this.sex);
};
var Tom = new SuperPerson("Tom","man");
Tom.friends.push("Amy");
console.log(Tom.friends);// ["Jack", "John", "Kim", "Amy"]
Tom.getName();// Tom
Tom.getSex();// man var David = new SuperPerson("David","man");
console.log(David.friends);// ["Jack", "John", "Kim"]
David.getName();// David
David.getSex();// man