Posted By
Bajarangi soft ,
Posted On 12-10-2020
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abstract |
arguments |
await* |
boolean |
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break |
byte |
case |
catch |
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char |
class* |
const |
continue |
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debugger |
default |
delete |
do |
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double |
else |
enum* |
eval |
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export* |
extends* |
false |
final |
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finally |
float |
for |
function |
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goto |
if |
implements |
import* |
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in |
instanceof |
int |
interface |
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let* |
long |
native |
new |
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null |
package |
private |
protected |
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public |
return |
short |
static |
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super* |
switch |
synchronized |
this |
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throw |
throws |
transient |
true |
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try |
typeof |
var |
void |
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volatile |
while |
with |
yield |
You can read more about the different JavaScript versions in the chapter JS Versions.
Removed Reserved Words
The following reserved words have been removed from the ECMAScript 5/6 standard:
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abstract |
boolean |
byte |
char |
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double |
final |
float |
goto |
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int |
long |
native |
short |
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synchronized |
throws |
transient |
volatile |
Do not use these words as variables. ECMAScript 5/6 does not have full support in all browsers.
JavaScript Objects, Properties, and Methods
You should also avoid using the name of JavaScript built-in objects, properties, and methods:|
Array |
Date |
eval |
function |
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hasOwnProperty |
Infinity |
isFinite |
isNaN |
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isPrototypeOf |
length |
Math |
NaN |
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name |
Number |
Object |
prototype |
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String |
toString |
undefined |
valueOf |
Java Reserved Words
JavaScript is often used together with Java. You should avoid using some Java objects and properties as JavaScript identifiers:
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getClass |
java |
JavaArray |
javaClass |
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JavaObject |
JavaPackage |
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Other Reserved Words
JavaScript can be used as the programming language in many applications.
You should also avoid using the name of HTML and Window objects and properties:
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alert |
all |
anchor |
anchors |
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area |
assign |
blur |
button |
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checkbox |
clearInterval |
clearTimeout |
clientInformation |
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close |
closed |
confirm |
constructor |
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crypto |
decodeURI |
decodeURIComponent |
defaultStatus |
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document |
element |
elements |
embed |
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embeds |
encodeURI |
encodeURIComponent |
escape |
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event |
fileUpload |
focus |
form |
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forms |
frame |
innerHeight |
innerWidth |
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layer |
layers |
link |
location |
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mimeTypes |
navigate |
navigator |
frames |
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frameRate |
hidden |
history |
image |
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images |
offscreenBuffering |
open |
opener |
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option |
outerHeight |
outerWidth |
packages |
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pageXOffset |
pageYOffset |
parent |
parseFloat |
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parseInt |
password |
pkcs11 |
plugin |
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prompt |
propertyIsEnum |
radio |
reset |
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screenX |
screenY |
scroll |
secure |
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select |
self |
setInterval |
setTimeout |
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status |
submit |
taint |
text |
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textarea |
top |
unescape |
untaint |
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window |
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HTML Event Handlers
In addition you should avoid using the name of all HTML event handlers.
Examples:
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onblur |
onclick |
onerror |
onfocus |
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onkeydown |
onkeypress |
onkeyup |
onmouseover |
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onload |
onmouseup |
onmousedown |
onsubmit |