Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
551 views
in Technique[技术] by (71.8m points)

javascript - Or operator not working in IF statement Node.js

I originally had a route in node.js that stated this:

If the req.url === something or something or something or something, do this, else, do that.

The problem is that the else statement never got executed even though the if condition was not met. Only the if statement executes no matter what

I have broken down my route to bare minimum trying to figure out the problem. I simplified it to this:

app.get('/test', function(req,res) {

        var category = 'stupid3';

        if(category === 'stupid' || 'stupid2') {

            res.end('yup');

        } else {

            res.end('nope');

        }

});

What am I doing wrong?

Why wont the else statement execute?

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Answer

0 votes
by (71.8m points)

You're using it incorrectly.

category === 'stupid' || category === 'stupid2'

Your version is effectively...

 (category === 'stupid') || 'stupid2'

...so because a non-empty string is "truthy", the RHS will always cause the || to pass.


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...