javascript - $.post和iframe

When the a tag is clicked, get the value of ssss, use the $.post method to access the CI controller, and the controller points to a view. $.post function(data){data is the complete code of a page (verified)}. I want to turn this data into a page and stuff it into an in HTML. Set the style yourself
Then the ajax request does not return the content of the html page but returns this content. Corresponding request address

$("#test").attr("src",json.url);