In JavaScript, you cannot use these reserved words as variable names, label names, or function names.
Reserved Words:
| abstract | arguments | boolean | break | byte |
| case | catch | char | const | continue |
| debugger | default | delete | do | double |
| else | eval | false | final | finally |
| float | for | function | goto | if |
| implements | in | instanceof | int | interface |
| long | native | new | null | package |
| private | protected | public | return | short |
| static | switch | synchronized | this | throw |
| throws | transient | true | try | typeof |
| var | void | volatile | while | with |
| yield | Â | Â | Â | Â |
Reserved Words added in ECMAScript 5 and 6:
| awaits | class | enum | export |
| extends | import | let | super |
Removed Reserved Words: The following reserved words have been removed from ECMAScript 5 and 6.
| abstract | boolean | byte | char |
| double | final | float | goto |
| int | long | native | short |
| synchronized | throws | transient | volatile |
Other Reserved Words: JavaScript can be used as the programming language in many applications.
| alert | all | anchor | area | anchors |
| assign | blur | button | checkbox | clearInterval |
| clearTimeout | clientInformation | close | closed | confirm |
| constructor | crypto | decodeURI | decodeURIComponent | defaultStatus |
| document | element | elements | embed | embeds |
| encodeURI | encodeURIComponent | escape | event | fileUpload |
| focus | form | forms | frame | innerHeight |
| innerWidth | layer | link | location | mimeTypes |
| navigate | navigator | frames | frameRate | hidden |
| history | image | images | offscreenBuffering | open |
| opener | option | outerWidth | outerHeight | packages |
| pageXOffset | pageYOffset | parent | parseFloat | parseInt |
| password | pkcs11 | plugin | prompt | propertyIsEnum |
| radio | reset | screenX | screenY | scroll |
| secure | select | self | setInterval | setTimeout |
| status | submit | taint | text | textarea |
HTML Event Handlers: The name of all HTML event handlers  should not be used in javascript
| onblur | onclick | onerror |
| onfocus | onkeydown | onkeypress |
| onkeyup | Â onmouseover | onload |
| onmouseup | onmousedown | onsubmit |
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