虽然可见如何使此对话框阻止访问其余页面内容？

im trying to make a dialog such that while it is visible, it prevents access to page content. if i click accept the dialog should disappear is never re-presented on subsequent visits. if a disagree it should redirection to another site, and continually represent the dialog on next visits, im having a lot of trouble with this i have the outline done but im having trouble to implement its functions. this is what i have doneim trying to make a dialog such that while it i