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docs(class-extends): fix typo
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@ -220,7 +220,7 @@ B.foo.n // 99
A.foo.n // 99
```
上面示例中，`A.foo`的值是一个对象，浅拷贝导致`B.foo`和`A.foo`指向同一个对象。所以，子类`A`修改这个对象的属性值，会影响到父类`A`。
上面示例中，`A.foo`的值是一个对象，浅拷贝导致`B.foo`和`A.foo`指向同一个对象。所以，子类`B`修改这个对象的属性值，会影响到父类`A`。
## Object.getPrototypeOf()