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@ -511,6 +511,8 @@ Reflect.ownKeys(myObject)
// ['foo', 'bar', Symbol(baz), Symbol(bing)]
```
如果第一个参数不是对象，`Reflect.ownKeys`方法会报错。
## 实例：使用 Proxy 实现观察者模式
观察者模式（Observer mode）指的是函数自动观察数据对象，一旦对象有变化，函数就会自动执行。