In my web app I need to give the user the option to save a js variable as a file (when the user clicks download, the app offers him to save a file, preffereably as .js file).
Similarly as google docs offers you to save a file.
Is it possible for javascript to pass it's variable this way?
Check out Downloadify which allows exactly this.
Downloadify is a tiny JavaScript + Flash library that enables the generation and saving of files on the fly, in the browser, without server interaction.
it requires Flash installed in the user's browser to work, though.
I know of no other way of doing this without server interaction.
You might also want to check out OpenSave:
http://www.gieson.com/Library/projects/utilities/opensave/
... which looks much like Downloadify, but seems to have a few extra features (and not as complicated?).
来源：https://stackoverflow.com/questions/2980569/open-a-save-file-dialog-for-a-js-variable