Reserved
words of the JavaScript langauge are listed below. (Some of these words are
actually used in the Java language, and are reserved in JavaScript for
compatibility purposes or as possible extensions.) When choosing names
for your JavaScript variables, avoid these reseved words!
|
abstract
|
else
|
instanceof
|
super
|
|
boolean
|
enum
|
int
|
switch
|
|
break
|
export
|
interface
|
synchronized
|
|
byte
|
extends
|
let
|
this
|
|
case
|
false
|
long
|
throw
|
|
catch
|
final
|
native
|
throws
|
|
char
|
finally
|
new
|
transient
|
|
class
|
float
|
null
|
true
|
|
const
|
for
|
package
|
try
|
|
continue
|
function
|
private
|
typeof
|
|
debugger
|
goto
|
protected
|
var
|
|
default
|
if
|
public
|
void
|
|
delete
|
implements
|
return
|
volatile
|
|
do
|
import
|
short
|
while
|
|
double
|
in
|
static
|
with
|
In
addition to the above reserved words, you'd better avoid the following
identifiers as names of JavaScript variables. These are predefined names of
implementation-dependent JavaScript objects, methods, or properties (and,
arguably, some should have been reserved words):
|
alert
|
frames
|
outerHeight
|
|
all
|
frameRate
|
outerWidth
|
|
anchor
|
function
|
packages
|
|
anchors
|
getClass
|
pageXOffset
|
|
area
|
hasOwnProperty
|
pageYOffset
|
|
Array
|
hidden
|
parent
|
|
assign
|
history
|
parseFloat
|
|
blur
|
image
|
parseInt
|
|
button
|
images
|
password
|
|
checkbox
|
Infinity
|
pkcs11
|
|
clearInterval
|
isFinite
|
plugin
|
|
clearTimeout
|
isNaN
|
prompt
|
|
clientInformation
|
isPrototypeOf
|
propertyIsEnum
|
|
close
|
java
|
prototype
|
|
closed
|
JavaArray
|
radio
|
|
confirm
|
JavaClass
|
reset
|
|
constructor
|
JavaObject
|
screenX
|
|
crypto
|
JavaPackage
|
screenY
|
|
Date
|
innerHeight
|
scroll
|
|
decodeURI
|
innerWidth
|
secure
|
|
decodeURIComponent
|
layer
|
select
|
|
defaultStatus
|
layers
|
self
|
|
document
|
length
|
setInterval
|
|
element
|
link
|
setTimeout
|
|
elements
|
location
|
status
|
|
embed
|
Math
|
String
|
|
embeds
|
mimeTypes
|
submit
|
|
encodeURI
|
name
|
taint
|
|
encodeURIComponent
|
NaN
|
text
|
|
escape
|
navigate
|
textarea
|
|
eval
|
navigator
|
top
|
|
event
|
Number
|
toString
|
|
fileUpload
|
Object
|
undefined
|
|
focus
|
offscreenBuffering
|
unescape
|
|
form
|
open
|
untaint
|
|
forms
|
opener
|
valueOf
|
|
frame
|
option
|
window
|
Similarly,
the following names (depending on your target browser) may have special
meanings as event handlers, and therefore should not be used for any
other purpose:
|
onbeforeunload
|
ondragdrop
|
onkeyup
|
onmouseover
|
|
onblur
|
onerror
|
onload
|
onmouseup
|
|
ondragdrop
|
onfocus
|
onmousedown
|
onreset
|
|
onclick
|
onkeydown
|
onmousemove
|
onsubmit
|
|
oncontextmenu
|
onkeypress
|
onmouseout
|
onunload
|
