Introduction - If you have any usage issues, please Google them yourself
Many times, we are in the preparation of the JS code, may be involved in cross domain operations, that is, the JS on the a.com may want to access the b.com data.
Due to the security constraints of the browser, JS, IFRAME, FLASH are unable to bypass this cross domain problem. Unless you have the right to modify the site. If you have access to the site of the right to modify, through the access to the site to add a license configuration file, you can also achieve FLASH cross domain operation.