如何删除使用Object.defineProperty添加到类实例的属性？

Question

It seems I can't just delete it, check it:

 class classy { constructor() { this.a = "I am classy"; } } var o = new classy(); Object.defineProperty(o, "b", {"get":()=>"hello"}); console.log("testing ob = " + ob); delete ob; console.log("deleted ob = " + ob); 

Answer 1

The default value of configurable is false so you should set it to true to be able to delete that property..

 class classy { constructor() { this.a = "I am classy"; } } var o = new classy(); Object.defineProperty(o, "b", { "get": () => "hello", configurable: true }); delete ob; console.log(ob)