我想要一個 javascript 類，將其子級映射到children.這是我到目前為止得到的：export default class Item {    constructor (id, name, children = []) {        this.id = id;        this.name = name;        this.children = children.map((child)=>{            return new Item(child.id, child.name, child.children)        });    }    test(){        console.log("Test");    }    //...}如果我現在這樣稱呼：let children = [    {id: 1, name: 'foo'},    {id: 2, name: 'bar'},    {id: 3, name: 'foobar', children: [        {id: 4, name: 'foo'},        {id: 5, name: 'bar'},    ]},];let newItem = new Item (item.id, item.name, item.children)我想我會得到這樣的遞歸映射：[  Item: { id: 1, name: 'foo' },  Item: { id: 2, name: 'bar' },  Item: { id: 3, name: 'foo', children: [ Item: { id: 4, name: 'foo'}, Item: { id: 5, name: 'bar'}] },]在這種情況下，我應該能夠拜訪test()任何孩子。newItem.children.forEach((child){ child.test(); });但這會拋出_vm.child.test 不是一個函數