小编Gad*_*med的帖子

我想仅当我的网站中没有打开的 chrome 选项卡或选项卡已打开且未选择（活动）时才显示 GCM 服务工作线程消息。

这是我的代码。

错误： chrome 未定义(\xe2\x80\xa6)。

清单.json

 {  \n  "name": "Webplus Express",  \n  "short_name": "Webplus Express",  \n  "icons": [{  \n    "src": "https://raw.githubusercontent.com/deanhume/typography/gh-pages/icons/typography.png",  \n    "sizes": "192x192",\n    "type": "image/png" \n    }],  \n    "start_url": "/index.html",  \n    "display": "standalone",  \n    "gcm_sender_id": "298340340811",\n    "gcm_user_visible_only": true,\n    "background": {\n    "scripts": ["service-worker.js"]\n    },    \n    "permissions": [\n    "gcm","tabs","activeTab"\n    ]  \n  }\n

service-worker.js

    // The service worker running in background to receive the incoming\n// push notifications and user clicks\nself.addEventListener(\'push\', function(event) { …