Several puzzle questions, ask

goodman111

Questions are as follows:
1. meaning request.referer
2. if (opener)
{window.close ();
}
  What does opener stand for?
 

Please answer, thanks

sulfuresser

Questions are as follows:
1. meaning request.referer
  
Get the url of the last visited page

2. if (opener)
{window.close ();
}
  What does opener stand for?
  Represents the parent form (or page) of an open window

zhouji700

1. request.referer: set or get the URL of the previous page

2, opener refers to the parent window that opens or pops up the current window
For example: a.htm:
window.open ('b.htm');
Then in b.htm, the window where a.htm is located is its opener

shenmue024

Previous page. Must be opened from the previous page, not directly from ie.

2.opener represents the window, and the current window is opened by this parent window through the window.open method.