js gets the element and variable values ​​​​in the html iframe_javascript skills

Last week I wanted to get the elements and js variable values ​​​​in the iframe, but I couldn’t get it. I checked the information and found out:

You cannot use the $(document).ready() method, but you must use the $("#iframeId").load() method. You can only obtain it after the iframe is loaded.

Get the js variable value in iframe:

document.frames['x'].y

That’s it.

Hey, it’s a very simple question, it took a long time, it shouldn’t be!