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Update proxy.md

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this问题中添加对handler.construct钩子函数中this的描述
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chua 2020-09-15 21:11:55 +08:00 committed by GitHub
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@ -1053,6 +1053,8 @@ proxy.foo // TypeError: Revoked
## this 问题
正常情况下，Proxy代理的钩子函数中的`this`指向的是Proxy代理实例（construct钩子函数除外，该钩子函数中`this`指向的是handler)
虽然 Proxy 可以代理针对目标对象的访问，但它不是目标对象的透明代理，即不做任何拦截的情况下，也无法保证与目标对象的行为一致。主要原因就是在 Proxy 代理的情况下，目标对象内部的`this`关键字会指向 Proxy 代理。
```javascript