Dart syntax- Isolates,typedefs,metadata,@

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  ☝called 讓實體能像方法一樣

☝Isolates dart能讓每個isolates有自己的記憶體和單線，解決多項事件同時共享記憶體時容易發生錯誤的問題。
☝typedefs 很像填表單一樣，有個單表名稱，內容就是自定義一個制式的程式格式。初始即對應填表單。
☝metadata @程式注記。可自定義。建立dart ，後導入 import xxx.dart ，@xxx。

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