问题
I did read a lot about SOP. What it does, and how it works, for example here in Wikipedia: http://en.wikipedia.org/wiki/Same-origin_policy
And I can often read, that the SOP is an important element of security in browsers and web-applications, that prevents attack.
My problem is: I can't think of any scenario where a cross-domain access would be dangerous for anyone.
Please can you describe at least one scenario that is prevented by SOP and would be a detriment for someone if it wasn't prevented .
来源：https://stackoverflow.com/questions/30108066/why-is-there-a-need-for-the-same-origin-policy-sop