json.decode json.decode返回值为Map<String, dynamic>直到运行的时候才能知道具体的类型 所以不能：类型检查，自动提示，编译时无法发现错误 json_serializable （1）pubspec.yaml中添加依赖 dependencies:
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Widget：https://flutter.io/docs/development/ui/widgets Flow：https://docs.flutter.io/flutter/widgets/Flow-class.html import 'package:flutter/mater
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Widget：https://flutter.io/docs/development/ui/widgets DataTable：https://docs.flutter.io/flutter/material/DataTable-class.html PaginatedDataTable：https
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Widget：https://flutter.io/docs/development/ui/widgets InkWell：https://docs.flutter.io/flutter/material/InkWell-class.html import 'package:flutte
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Widget：https://flutter.io/docs/development/ui/widgets Material：https://docs.flutter.io/flutter/material/Material-class.html import 'package:flut
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Widget：https://flutter.io/docs/development/ui/widgets GridView：https://docs.flutter.io/flutter/widgets/GridView-class.html import 'package:flutt
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Widget：https://flutter.io/docs/development/ui/widgets ListTile：https://docs.flutter.io/flutter/material/ListTile-class.html import 'package:flut
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Widget：https://flutter.io/docs/development/ui/widgets Card：https://docs.flutter.io/flutter/material/Card-class.html import 'package:flutter/mate
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Widget：https://flutter.io/docs/development/ui/widgets Stepper：https://docs.flutter.io/flutter/material/Stepper-class.html import 'package:flutte
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Widget：https://flutter.io/docs/development/ui/widgets ExpansionPanelList：https://docs.flutter.io/flutter/material/ExpansionPanelList-class.html Expans
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Widget：https://flutter.io/docs/development/ui/widgets Drawer：https://docs.flutter.io/flutter/material/Drawer-class.html import 'package:flutter/
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Widget：https://flutter.io/docs/development/ui/widgets Stack：https://docs.flutter.io/flutter/widgets/Stack-class.html import 'package:flutter/mat
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Widget：https://flutter.io/docs/development/ui/widgets Wrap：https://docs.flutter.io/flutter/widgets/Wrap-class.html import 'package:flutter/mater
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Widget：https://flutter.io/docs/development/ui/widgets ListTile：https://docs.flutter.io/flutter/material/ListTile-class.html import 'package:flut
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Widget：https://flutter.io/docs/development/ui/widgets CircleAvatar：https://docs.flutter.io/flutter/material/CircleAvatar-class.html import 'pack
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