[26. Unicode in ES6](39.md) [27. 尾部调用优化](40.md) [28 用 Proxy 实现元编程](28%20%E7%94%A8%20Proxy%20%E5%AE%9E%E7%8E%B0%E5%85%83%E7%BC%96%E7%A8%8B.md) [29. Coding style tips for ECMAScript 6](42.md) [30. 概述ES6中的新内容](43.md)