Js gets the values of the elements and variables in the HTML iframe

Last week, I tried to get the values of the elements and js variables in the iframe, but I failed to get them.

Instead of using the $(document).ready() method, you can use the $("#iframeId").load() method, which is not available until the iframe is loaded

Take the value of the js variable in the iframe:

document.frames['x'].y

That's fine.