如何从父窗口获取iframe中的定位标记？

Question

在我的父窗口中有一个iframe，我想从父窗口获取iframe中存在的定位标记。如果可能，请给出建议，否则请说明为什么不可能。

Answer 1

Lets say your iframe is:

<iframe id="myframe"></iframe>

First you need to access its document

var iframe_doc = document.getElementById("myframe").contentDocument;

Now you can work with it.

To get all anchors:

var all_anchors = iframe_doc.getElementsByTagName("a");

(You will not be able to do that if the parent and the iframe don't share the same protocol, domain and port due to same origin policy)