SOURCE

var o = (function() {
    var obj = {
        name: 'obj',
        age: 12
    }
    return {
        get(name) {
            return obj[name]
        }
    }
})()

Object.defineProperty(Object.prototype, 'abc', {
    get() {
        return this
    }
})

o.get('abc').name = '22222'

console.log(o.get('name'))