Load a webpage from another domain and inject javascript

Question

I wish to create a mobile optimized web app by loading a website from a domain( that i do not own) and then running some java script code onto it to modify the layout. How would this be possible as I've read that javascript does not allow cross domain requests.

Would using an iframe and then somehow modify the content of the iframe be possible?

Answer 1

没有骇客就不可能，只有骇客才有可能。