编辑代码

const node = {
    "id": 1,
    "level": 0,
    "children": [{
        "id": 2,
        "level": 0,
        "children": [{
            "id": 4,
            "level": 0,
            "children": []
        }, {
            "id": 5,
            "level": 0,
            "children": []
        }, {
            "id": 6,
            "level": 0,
            "children": []
        }]
    }, {
        "id": 3,
        "level": 0,
        "children": []
    }]
}

const measure = (node) => {
    let queue = [];
    queue.push(node);
    while (queue.length > 0) {
        const { id, level, children } = queue.shift();
        console.log(`id:${id}, level:${level}`);
        for (let child of children) {
            queue.push(Object.assign(child, { level: level + 1 }));
        }
    }
}

measure(node);