<p>Is there a way to use constants in <strong>JavaScript</strong>?</p>

<p>If not, what's the common practice for specifying variables that are used as constants?</p>

No, not in general. Firefox implements
```
const
```
but I know IE doesn't.
@John
points to a common naming practice for consts that has been used for years in other languages, I see no reason why you couldn't use that. Of course that doesn't mean someone will not write over the variable's value anyway. :)