js中如何递归遍历dom树

function getTree2(data, id) {

    // 判断传入的数据是否是数组

    if (Object.prototype.toString.call(data) !== '[object Array]') return

    const root = data.filter(item => item.pid === id)

    const list = []

        // 遍历跟节点

    root.forEach(item => {

        const obj = {...item,children: getTree2(data, item.id) } // 递归方法，自己调用自己

        list.push(obj)

    })

    return list

}

console.log(getTree2(data, 0))