关键字是什么
关键字就是保留字，比如变量、类型等的名字，通常不能作为标识符使用；
Dart关键字
| 关键字 | - | - | - |
|---|---|---|---|
| abstract | do | import | super |
| as | dynamic | in | switch |
| assert | else | interface | sync* |
| enum | implements | is | this |
| async* | export | library | throw |
| await | external | mixin | true |
| break | extends | new | try |
| case | factory | null | typedef |
| catch | false | operator | var |
| class | final | part | void |
| const | finally | rethrow | while |
| continue | for | return | with |
| covariant | get | set | yield* |
| default | if | static | deferred |
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