javascript 从父级到子级 iframe 进行跨域通信
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Communicating cross-origin from parent to child iframe
提问by Benmj
I'm working through Third Party Javascript. I'm particularly interested in communication between a parent page and a child frame from a different origin. Using window.postMessage, it's trivial to safely send messages from the child and have the parent receive them with the messageevent.
我正在通过第三方 Javascript 工作。我对父页面和来自不同来源的子框架之间的通信特别感兴趣。使用 window.postMessage，安全地从子进程发送消息并让父进程通过message事件接收它们是微不足道的。
I have had no luck going the other direction. Can I get some confirmation that it is notpossible to communicate from the parent to the child using postMessage? If not what are ways of working around this problem?
我没有运气去另一个方向。我是否可以确认无法使用 postMessage 从父级到子级进行通信？如果不是，有什么方法可以解决这个问题？
回答by jfriend00
You should be able to use .postMessage()between any two cooperating windows. It doesn't matter which direction you are sending the message. If it is not working in one direction, then there is probably an error in the implementation. You may need to make sure you have the proper window object.
您应该能够.postMessage()在任何两个协作窗口之间使用。您发送消息的方向无关紧要。如果它不是在一个方向上工作，那么实施中可能存在错误。您可能需要确保拥有正确的 window 对象。
For an iframe, you would want to use the .contentWindowproperty to get its window in modern browsers.
对于 iframe，您可能希望使用该.contentWindow属性在现代浏览器中获取其窗口。
Some good documentation here: https://developer.mozilla.org/en-US/docs/Web/API/window.postMessage
这里有一些很好的文档：https: //developer.mozilla.org/en-US/docs/Web/API/window.postMessage
