标签：javascrip 优点 script const || 构造 原型链 继承 nbsp
/** * 组合继承 */ function Super(name) { this.name = name || ‘‘; } Super.prototype.age = 23; function Sub(name) { Super.call(this, name); this.eat = function() { return this.name + ‘eat‘; } } Sub.prototype = new Super(); Sub.prototype.constructor = Sub var sub = new Sub(‘xiaoming‘); console.log(sub);
/**
* 寄生组合继承
*/
function Super(name) {
this.name = name || ‘‘;
}
Super.prototype.age = 23;
function init(Sub, Sup) {
var proto = Object(Sup.prototype);
proto.constructor = Sub;
Sub.prototype = proto;
}
function Sub(name) {
Super.call(this, name);
this.eat = function() {
return this.name + ‘eat‘;
}
}
init(Sub, Super);
// Sub.prototype = new Super();
// Sub.prototype.constructor = Sub
var sub = new Sub(‘xiaoming‘);
console.log(sub);
1、原型链继承
2、构造函数继承
3、组合继承
其实就是结合了原型链继承和构造函数的继承
缺点：之类继承父类的过程需要两次调用父类的构造器，这其实很浪费。
4、组合寄生继承
优点：解决了组合继承的缺点
缺点：复杂，而且当你改变子类的prototype时，父类的prototype也会改变。
标签：javascrip 优点 script const || 构造 原型链 继承 nbsp
原文地址：https://www.cnblogs.com/pengwenfan/p/9012913.html
