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                            proxy:  代理一個 target，自定義一些操作方法，并生成一個新的對象
             可以只操作對象達到目的，而 Object.defineProperty需要遍歷屬性
```
let obj = { a: 1, b: 2, }

const p = new Proxy(obj, {
  get(target, key, value) {
    if (key === 'c') {
      return '我是自定義的一個結果';
    } else {
      return target[key];
    }
  },

  set(target, key, value) {
    if (value === 4) {
      target[key] = '我是自定義的一個結果';
    } else {
      target[key] = value;
    }
  }
})
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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