Javascript：如何将getter添加到现有对象

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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' } });