予約語
| break | else | new | var |
| case | finally | return | void |
| chatch | for | switch | while |
| continue | function | this | with |
| default | if | throw | |
| delete | in | try | |
| do | instanceof | tpeof |
将来のために予約されている語もある：
| abstract | enum | int | short |
| boolean | export | interface | static |
| bye | extends | long | super |
| char | final | native | synchronized |
| class | float | package | throws |
| const | goto | private | transient |
| debugger | implements | protected | volatile |
| double | import | public |