window.opener
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
概述
返回打开当前窗口的那个窗口的引用，例如：在 window A 中打开了 window B，B.opener 返回 A.
语法
var objRef = window.opener;
例子
js
if (window.opener != indexWin) {
referToTop(window.opener);
}
备注
如果当前窗口是由另一个窗口打开的，window.opener保留了那个窗口的引用。如果当前窗口不是由其他窗口打开的，则该属性返回 null.
规范
| Specification |
|---|
| HTML Standard # dom-opener-dev |
浏览器兼容性
BCD tables only load in the browser