### WEB PUSH INTRO
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* Push Diagram
* Service Worker
* Firebase Cloud Messaging
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### Push Diagram
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### Service Worker
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- W3C 提出了Web Worker API 來專門解放主線程
- 實現離線訪問、穩定訪問、靜態資源緩存的一項重要技術
- 不可操作 DOM 也不能取用 WINDOW
- 透過postMessage / onmessage 與主線程溝通
- 有自己的作用域
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### Firebase Cloud Messaging (FCM)
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