如何删除用 Object.defineProperty 定义的 window getter

Question

如果我这样做：

Object.defineProperty(window, 'hello',{ 
   get: ()=>"hello to you!"
});

调用方式为：

你好

并回复向你问好！我该如何删除它？

Answer 1

您需要将另一个属性添加到您在 defineProperty 中传递的描述符对象，即 configurable: true，之后您可以删除属性使用delete 运算符。

'use strict'
Object.defineProperty(window, 'hello',{ 
  get: ()=>"hello to you!",
  configurable: true //make this true
});
console.log(window.hello);
delete window.hello
// hello is deleted from window
console.log(window.hello);

默认情况下，如果您不将描述符对象的 configurable 设置为 true，则它是假的，来自 docs:

configurable

true if and only if the type of this property descriptor may be changed and if the property may be deleted from the corresponding object. Defaults to false.

如何删除用 Object.defineProperty 定义的 window getter

How to delete a window getter defined with Object.defineProperty

javascript

getter

window

object