Web support

[gabrc52]

For web, JavaScript alert can be used.

[hatemragab]

any updates?

[danielinooo95]

any updates?

[Zhoucheng133]

I think javascript alert can be used without this package:

import 'dart:html' as html;
html.window.alert('This is a browser alert.');

Tip: If you use it directly, it may have warning, you can add "avoid_web_libraries_in_flutter" in head