app.use（“ /”，express.static）和app.use（express.static）之间有区别吗？

Question

Is there a difference between the following, assuming that we first have called app.set('thePath', thePath) ?

1. app.use('/', express.static(thePath))
2. app.use(express.static(thePath))
3. app.use(express.static(app.get('thePath')))

It seems like (1) and (2) would do the same thing.

As far as I know, in Javascript, if you call a function it evaluates at that time being called, so even if app.get('thePath') changes or if thePath changes, all of them would stay the same.

If there is a difference, please let me know what and why it is.

Answer 1

http://expressjs.com/en/4x/api.html#app.use

If path is not specified, it defaults to “/”.

So yes, 1 & 2 are the same. Assuming thePath is a variable pointing to a valid root directory of static assets.