go代码中会使用到25个关键字和保留字
| break | default | func | interface | select |
| case | defer | go | map | struct |
| chan | else | goto | package | switch |
| const | fallthrough | if | range | type |
| continue | for | import | return | var |
go代码经常用到的预定义标识符
| append | bool | byte | cap | close | complex | complex64 | complex128 | uint16 |
| copy | false | float32 | float64 | imag | int | int8 | int16 | uint32 |
| int32 | int64 | iota | len | make | new | nil | panic | uint64 |
| println | real | recover | string | true | uint | uint8 | uintptr |