js 判断是否安装了app

function isAppInstalled(urlScheme) {
    return new Promise((resolve) => {
        const iframe = document.createElement('iframe');
        iframe.style.display = 'none';
        iframe.src = urlScheme;
        document.body.appendChild(iframe);

        setTimeout(() => {
            document.body.removeChild(iframe);
            resolve(false); // 如果app未安装，通常会超时
        }, 2000);

        window.addEventListener('blur', () => {
            resolve(true); // 如果app安装并打开，页面会失去焦点
        }, { once: true });
    });
}

isAppInstalled('myapp://').then((installed) => {
    console.log('App installed:', installed);
});

function isAppInstalled() {
    return new Promise((resolve) => {
        const link = document.createElement('a');
        link.href = 'https://yourdomain.com/path/to/content';
        link.style.display = 'none';
        document.body.appendChild(link);

        link.click();

        setTimeout(() => {
            resolve(false); // 如果app未安装，通常会打开网页
        }, 2000);

        window.addEventListener('blur', () => {
            resolve(true); // 如果app安装并打开，页面会失去焦点
        }, { once: true });
    });
}

isAppInstalled().then((installed) => {
    console.log('App installed:', installed);
});