为什么这里的this被改变了

Question

class Test {
    test(){
        console.log(this)
    }
}

let test1 = new Test()


let {test} = new Test()
test1.test() //Test
//怎样才能让这里实现啊
test() //undefined

Answer 1

class Test {
    constructor(){
        this.test = this.test.bind(this)
    }
    test(){
        console.log(this)
    }
}