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Dart?????

1. ????

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?Dart??????????????????library?????????????????import???

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2. ?????

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async?await

• ??async??????await??????
• ????async?????await?

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??deferred as??????????????????

3. Pub????????

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• pub.dev/packages
• pub.flutter-io.cn/packages
• pub.dartlang.org/flutter/

??Pub???

??pubspec.yaml????????

name: xxxdescription: A new flutter module projectdependencies:  http: ^0.12.0+2  date_format: ^1.0.6

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??pub get??????????????

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4. ????????

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??as?????????????????

5. ???????

selective import

• ??show?????????
• ??hide?????????

6. ??????

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??deferred as????loadLibrary()???????????????

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