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Merge branch 'gh-pages' of github.com:ruanyf/es6tutorial into gh-pages

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@ -451,11 +451,11 @@ Object.getOwnPropertyNames(myObject)
// ['foo', 'bar']
Object.getOwnPropertySymbols(myObject)
//[Symbol.for('baz'), Symbol.for('bing')]
//[Symbol(baz), Symbol(bing)]
// 新写法
Reflect.ownKeys(myObject)
// ['foo', 'bar', Symbol.for('baz'), Symbol.for('bing')]
// ['foo', 'bar', Symbol(baz), Symbol(bing)]
```
## 实例：使用 Proxy 实现观察者模式