问题
When I run:
$ flutter build web
I'm getting the error
Missing index.html.
The flutter app is displaying in the browser, but in VS Code it reads "No Device." How can I debug, or fix this problem?
回答1:
It would help to see the output of your flutter doctor, but I am guessing that your project is not configured for web.
If you haven't already, you need to switch to the flutter beta channel like so:
$ flutter channel beta
$ flutter upgrade
$ flutter config --enable-web
At this point, running flutter doctor should show that chrome is available.
Then, switch into your application root directory, and run
$ flutter create .
This will rebuild the project to support web.
Then, from the same directory, you can run flutter build web
回答2:
It happens if you have already created flutter project before you switched to flutter channel beta.
By using flutter channel beta to create a new flutter project, you will have a web folder.
You can see on the above image, the Left one, Flutter_Web, was created using stable channel.
On the other side, Web2 was just created by using the beta channel.
So for your case, I suggest following steps :
switch to Flutter Beta Channel here for details
create new Flutter project using :
flutter create
- try to run
flutter run -d chrome
- replace your previous project lib folder to this new
web project
回答3:
I had this problem. I could run web app in debug mode but I couldn't create web app.
Run this line in terminal to solve problem:
flutter create .
This will add web app to your project.
来源：https://stackoverflow.com/questions/62316589/flutter-build-web-is-throwing-the-error-missing-index-html