当更新值时，无法在“”Node“”上执行“”insertBefore“”

// 错误示例
let newNode = document.createElement('div');
newNode.insertBefore(document.getElementById('targetNode'), newNode.firstChild);

// 正确示例
let parentNode = document.getElementById('parentNode');
let newNode = document.createElement('div');
parentNode.insertBefore(newNode, document.getElementById('targetNode'));

// 错误示例
let parentNode = document.getElementById('parentNode');
let newNode = document.createElement('div');
parentNode.insertBefore(newNode, document.getElementById('nonExistentNode'));

// 正确示例
if (document.getElementById('targetNode')) {
    parentNode.insertBefore(newNode, document.getElementById('targetNode'));
} else {
    console.error('参照节点不存在');
}

// 错误示例
let parentNode = document.getElementById('parentNode');
let newNode = document.createElement('div');
parentNode.insertBefore(newNode, null); // null 不是一个有效的参照节点

// 正确示例
let validRefNode = document.getElementById('validRefNode') || null;
parentNode.insertBefore(newNode, validRefNode);