如何知道一个节点在虚拟TreeView中是根？

class TreeNode {
    constructor(value, isRoot = false) {
        this.value = value;
        this.isRoot = isRoot;
        this.children = [];
    }
}

// 示例数据
const rootNode = new TreeNode('Root', true);
const childNode1 = new TreeNode('Child1');
rootNode.children.push(childNode1);

console.log(rootNode.isRoot); // 输出: true
console.log(childNode1.isRoot); // 输出: false

class TreeNode {
    constructor(value, parent = null) {
        this.value = value;
        this.parent = parent;
        this.children = [];
    }
}

// 示例数据
const rootNode = new TreeNode('Root');
const childNode1 = new TreeNode('Child1', rootNode);
rootNode.children.push(childNode1);

function isRoot(node) {
    return node.parent === null;
}

console.log(isRoot(rootNode)); // 输出: true
console.log(isRoot(childNode1)); // 输出: false

function findRootNode(nodes) {
    for (const node of nodes) {
        if (!node.parent) {
            return node;
        }
    }
    return null;
}

// 示例数据
const rootNode = new TreeNode('Root');
const childNode1 = new TreeNode('Child1', rootNode);
rootNode.children.push(childNode1);

const root = findRootNode([rootNode, childNode1]);
console.log(root.value); // 输出: Root