manifest - 添加到主屏幕在 Beforeinstallprompt 事件触发后不提示

Question

即使满足所有 PWA 规范并在 Light House 上检查后，添加到主屏幕也不会提示。

我已尝试以下代码来检查应用程序是否已安装。但 appinstalled 事件未触发，而 beforeinstallprompt 事件已成功触发。

//应用程序已安装

window.addEventListener('appinstalled', (evt) => { app.logEvent('a2hs', '已安装'); });

//安装提示之前

  window.addEventListener('beforeinstallprompt', (event) => {
   event.preventDefault();
   deferredPrompt = event;
 });```

// manifest.json

`{
    "name": "demo",
    "short_name": "demo",
    "icons": [{
            "src": "/static/public/icon/icon-192x192.png",
            "sizes": "512x512",
            "type": "image/png"
        },
        {
            "src": "/static/public/icon/icon-512x512.png",
            "sizes": "192x192",
            "type": "image/png"
        }
    ],
    "start_url": "/",
    "orientation": "portrait",
    "display": "standalone",
    "theme_color": "#085689",
    "background_color": "#085689",
    "gcm_sender_id": "103xx3xxx50x",
    "gcm_user_visible_only": true
}
`

// service worker

`self.addEventListener('fetch', (event) => {
    console.log('event', event);
});`

Answer 1

从代码中删除此行

event.preventDefault();

从 Chrome 76 开始，preventDefault() 停止显示自动迷你信息栏

更多详情请点击这里
https://developers.google.com/web/fundamentals/app-install-banners/