Javascript：如何将getter添加到现有对象 [英] Javascript : How to add getter to an existing object

问题描述

我可以在这样的JavaScript对象中使用getter

I can have getter in JavaScript object like this

var member = {
    firstName:"XYZ", 
    lastName:"zzz", 
    get fullName(){ return (this.firstName + ' ' + this.lastName); }
}

我甚至可以像这样添加更多属性

And I can even add more properties on the fly like this

member.isGuest = true;

但有没有办法可以将getter添加到现有对象中？这样的东西

But is there any way we can add getters to already existing object? Something like this

member.isGuest = get isGuest(){ return this.firstName=='Guest'; }

推荐答案

尝试 defineProperty

Object.defineProperty(member, 'isGuest', {
  get: function() { return this.firstName=='Guest' }
});

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