Proxy可以做到！我很高兴这个存在！这里给出一个答案：是否有与python的__getattr__方法等效的JavaScript？。用我自己的话改写：

var x = new Proxy({}, {

  get(target, name) {

    return "Its hilarious you think I have " + name

  }

})



console.log(x.hair) // logs: "Its hilarious you think I have hair"

适用于chrome，firefox和node.js。缺点：在IE中不起作用-freakin IE。不久。