第一种:冒充方式继承
冒充方式其实是程序员为了实现继承而采取trick
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冒充方式的缺点就是必须使用构造函数
第二种:原型链
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这种方法实现类继承很是灵活,实用.不过原型链的不足就是它不支持多重继承,并且构造函数也不能带有参数.
总结以上,对象冒充的主要问题是必须使用构造函数方式,这不是最好的选择,但是使用原型链就无法使用带参数的构造函数了。所以,现在介绍一种两全其美的方式------混合方式.
以前,我们创建类的最好方式是用构造函数方式定义属性,用原型方式定义方法。同样的这种方式也适用于继承机制,用对象冒充继承构造函数的属性,用原型链继承prototype对象的方法.
第三种:混合法(冒充法+原型链法)
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