子框架會打開一個彈出窗口。如何檢查該彈出窗口是否從父窗口打開？

Question

我有一個頁面包含一個框架。在這個框架內，我可以打開一個彈出窗口。我怎麼知道這個彈出窗口是否從父頁面打開？

Answer 1

if (window.opener && 
    window.opener.top === window.opener) { 
    // this window was opened from a window that is it's own top (not an IFrame) 
}