js如何弹出子窗口居中显示

function openCenteredWindow(url, title, w, h) {
    // 获取屏幕宽度和高度
    const screenWidth = window.screen.width;
    const screenHeight = window.screen.height;

    // 计算子窗口的左上角坐标以使其居中
    const left = (screenWidth - w) / 2;
    const top = (screenHeight - h) / 2;

    // 打开新窗口，并设置其位置和尺寸
    const newWindow = window.open(url, title, `width=${w},height=${h},left=${left},top=${top}`);

    // 确保新窗口居中显示
    if (newWindow) {
        newWindow.focus();
    }

    return newWindow;
}

// 使用示例
openCenteredWindow('https://example.com', 'My Centered Window', 600, 400);