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Proxy

Proxy ( 语言层面做出修改 对编程语言进行编程 meta programming )

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// 重新定义了obj的get、set方法
const obj = new Proxy(
  {},
  {
    get: function(target, key, receiver) {
      console.log(`getting ${key}!`);
      return Reflect.get(target, key, receiver);
    },
    set: function(target, key, value, receiver) {
      console.log(`setting ${key}!`);
      return Reflect.set(target, key, value, receiver);
    }
  }
);

obj.count = 1 // setting count!
++ obj.count // getting count!        setting count!
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ES6原生提供的Proxy构造函数:
var proxy = new Proxy()
# ES6
record-for-ts
装饰器

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