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51CTO
10 年
JavaScript中typeof和instanceof深入详解
我们可以发现,subtrace是按照向上找的原则,而add则出了意外。原因就是,属性在查找的时候是先查找自身的属性,如果没有再查找原型。 理解原型 原型是一个对象,其他对象可以通过它实现属性继承。任何一个对象都可以成为继承,所有对象在默认的情况下都 ...
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